CN106836244A - Method for protecting steep slope roadbed by combining anti-slide piles and gabion high retaining wall - Google Patents

Abstract

A method for protecting steep slope roadbed by combining anti-slip piles and gabion high retaining walls, comprising the following steps: (1) excavating waste slag to regenerate various levels of material sources; (2) anti-slip pile construction; (3) installation of concrete retaining plates; (4) gabion high retaining wall construction; (5) process cycle; (6) greening of the surface of the gabion high retaining wall. The anti-slip piles, gabion boxes and compacted fill of the present invention work together to form an integral structure that bears the load together, thereby maintaining the long-term stability and long-term safe operation of the steep slope roadbed slope; and the combined slope protection of the present invention can make the gabion high retaining wall steep and stepped, reducing the amount of earth and stone cut and surface damage, and saving filler, land and vegetation resources. At the same time, the pores in the gabion retaining wall stone can be implanted with soil and vegetation, which is beneficial to the greening of the slope and ecological restoration, and produces landscape, ecological and environmental benefits.

Description

A method for combined protection of steep slope subgrade with anti-slide piles and high gabion retaining wall

technical field

The invention belongs to the technical field of slope protection in geotechnical engineering, and in particular relates to a construction method for combined protection of steep slope subgrades with anti-slide piles and gabion high retaining walls.

Background technique

When building roads in mountainous or hilly areas, due to complex geological, topographical and topographical conditions, geological disasters such as side slope landslides often occur on high-fill steep slope subgrades. For this reason, reinforced high retaining walls are commonly used for steep slope subgrade slope protection. However, there are many defects in the reinforced high retaining wall, including: (1) seepage damage due to poor drainage; (2) “bulging” of the surface wall due to grid creep; (3) environmental incongruity caused by masonry protection.

In the invention patent of "Construction method of river reinforced gabion permeable geotextile composite ecological slope protection and retaining wall" with the invention publication number CN104612107A, a construction method of river reinforced gabion permeable geotextile composite ecological slope protection and retaining wall is disclosed. The gabion components must meet the engineering requirements and are made of hexagonal double-stranded steel wire mesh woven by anti-corrosion treated low-carbon steel wires; the gabion assembly, gabion installation, stone filling, cover plate stranding, and gravel backfilling are carried out in sequence , Geogrid laying, permeable non-woven geotextile laying, filling compaction and other processes. The construction method of river reinforced gabion permeable geotextile composite ecological slope protection and retaining wall provided by the invention can be widely used in water conservancy, shipping, coast, slope protection, embankment, channel, municipal administration, road, railway, culvert, garden, park, real estate The construction of slope protection and retaining walls in residential areas has high compressive strength, good frost resistance, economical appearance, safety and reliability, but this invention is only suitable for river slope protection, not suitable for mountainous and hilly areas, and the stones filled in gabion components need to be obtained from It is mined and transported.

In the utility model patent of "A Slope Anti-sliding Retaining Structure Combining Heavy Rail Retaining Wall and Anti-slide Pile" with the invention publication number CN204435395U, a side slope combined with heavy rail retaining wall and anti-slide pile is disclosed. Slope anti-skid retaining structure. The support and retaining structure involved in the utility model is composed of a retaining wall provided with heavy rails and anti-sliding piles equipped with heavy rail cages. This utility model forms a continuous and easy-to-construct support structure with strong anti-sliding ability on the slope to ensure that multiple anti-sliding heavy rails are inserted into the stable stratum of the slope to play the role of overall anti-sliding of the slope. However, the utility model involves The retaining wall will cause seepage damage due to poor drainage, and has the disadvantages of slow construction speed and long construction period, and masonry protection will cause uncoordinated environment.

The combined slope protection structure of anti-sliding piles and gabion high retaining walls can overcome the inherent defects of reinforced high retaining walls. In this structure, the anti-slide piles and the high gabion retaining wall (including the gabion cage, the reinforcement mesh surface and the compacted fill) work together to form an overall structure that can jointly bear the earth pressure, thereby realizing the steep slope subgrade Joint slope protection. Anti-slide piles can not only support the retaining soil, but also shrink the slope toe and occupy less land; while the gabion high retaining wall has dual functions of retaining and filling.

The gabion high retaining wall has the advantages of safety and stability, smooth drainage, economical durability and ecological environmental protection. It can provide a new retaining structure with fast construction, long-term stability, safety and reliability for the protection of steep slope subgrade slopes under complex geological conditions, especially for seepage Under the conditions of complex conditions and high seepage strength, the construction of steep slope subgrade protection works for landscape roads.

In addition, during the construction of steep slope subgrades, a large amount of excavation and waste dregs will be generated, and the accumulation of waste dregs will destroy surface vegetation, induce water and soil erosion, and ultimately endanger the surrounding ecological environment. Therefore, sorting, crushing, screening and recycling the excavated dregs can obtain the filling stones for gabion cages, which can not only alleviate the shortage of natural building materials, but also avoid land occupation and environmental pollution caused by dregs piled up.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, provide a method for combined protection of steep slope subgrades with anti-slide piles and gabion high retaining walls, and provide a feasible technical approach for steep slope subgrade reinforcement and excavation disposal.

To achieve the above object, the present invention adopts the following technical solutions:

A method for combined protection of steep slope subgrades with anti-slide piles and Gabion high retaining walls, comprising the following steps:

(1) Excavation and disposal of dregs to regenerate material sources at all levels

At the construction site of the steep slope subgrade, sorting, crushing and screening techniques are used sequentially to regenerate the excavated muck on site to obtain stone materials for filling gabion cages and backfill sources for steep slope subgrades. Filler sources include various recycled materials in different particle size ranges;

(2) Anti-slide pile construction

After completing the site leveling, pile position measurement and derrick installation preparations, the anti-slide pile construction work can be officially carried out, including: underground pile hole excavation, pile body concrete pouring and ground pile construction;

1) Excavation of underground pile holes

①Lock

In order to ensure the stability of the underground pile hole opening, when the underground pile hole is dug to a depth of 2m, a C25 reinforced concrete locking wall with a wall thickness of 20cm±5cm is cast in the vertical form, and the top surface of the locking hole is flat and 55cm above the ground of the construction site ;

② Excavation and ballasting

Excavate the underground pile holes layer by layer from top to bottom, first dig the earthwork in the middle of the underground pile holes, and then expand to the boundary of the underground pile holes; manually load the ballast in the underground pile holes, then use the lifting equipment to transport the ballast, and put The ballast is transported to the storage yard for stacking; during the excavation of the underground pile hole, it is required to excavate the underground pile hole while retaining the wall, and the wall should be protected once every time the underground pile hole is dug into a depth of 2m;

③ retaining wall

Firstly, install the retaining wall steel form in the underground pile hole, and correct the position of the retaining wall steel form according to the central axis of the underground pile hole, and the overlap between the upper and lower two adjacent retaining walls is 50mm long; after the retaining wall steel form is installed, pour the retaining wall concrete, And remove the retaining wall steel mold after the strength of retaining wall concrete reaches the design strength;

2) Pile body concrete pouring

① Lowering the reinforcement cage: firstly, according to the design requirements, reinforce the reinforcement, tie and weld the reinforcement cage on the surface; finally, use the winch to put the reinforcement cage into the underground pile hole;

②Pouring concrete for pile body: Use string tube or crane to transport concrete to the underground pile hole, then pour concrete for pile body into the underground pile hole, pour concrete for pile body in layers, and the thickness of concrete for each layer of pile body after tamping is ≤ 30cm;

③Pile quality inspection: After the concrete of the pile body and the steel cage form an underground pile, the quality of the underground pile is measured by a non-destructive method;

3) Ground pile construction

① Connect the pile head

First, break and clean the pile head of the underground pile; then, straighten and weld the vertical steel bars and stirrups in the pile head of the underground pile;

②Set up scaffolding

Both the length and width of the scaffold exceed the edge of the pile formwork on the ground by 2.0m, and the height of the scaffold exceeds the height of the pile formwork on the ground by 1.2m;

③Establish the reinforcement cage

The height of the above-ground pile is 6-8m; the steel cage of the above-ground pile is welded and formed at one time; the concrete of the above-ground pile is poured in batches, and the height of one-time pouring is 3.0m;

④Configuration template

In order to speed up the construction progress, the pile formwork is equipped; the external pads of the pile reinforcement cage on the ground are used as a protective layer;

⑤Pouring concrete

The concrete is hoisted by a crane, and the concrete is continuously poured into the reinforcement cage of the above-ground piles to form the above-ground piles;

(3) Install concrete retaining board

Along the road direction, several anti-slide piles are arranged at intervals according to the above steps (1)-(2). On the side of the anti-slide piles close to the steep slope subgrade, install prefabricated concrete retaining boards in sections, and connect the concrete retaining boards into one;

(4) Construction of gabion high retaining wall

The piles on the ground and the top surface of the subgrade form a filling area, and the multi-level stepped Gabion high retaining wall construction is carried out in the filling area;

1) Gabion cage installation

① Gabion cage assembly

Expand the gabion cage, stretch the folds, and connect the gabion cage with a stainless steel wire buckle ring;

② Gabion cage code construction

Lay the gabion cages in the designated position in layers; and correct the distortion and deformation when the gabion cages are stacked, and correct the folded size;

③ Gabion cage connection

Use the bundled steel wire with a diameter of not less than 3.0mm to connect each gabion cage into a whole by continuous winding method;

2) Gabion cage filling

Use the stones to fill the stacked gabion cages, and put the stones in layers. The thickness of each layer is 1/3 times the height of the gabion cages. In order to prevent the gabion cages from twisting and deforming, two adjacent gabion cages The height difference of the surface layer of stone materials is ≤35cm; each layer of stone materials is put in and adjusted by manual tamping to ensure the compactness and flatness;

On the upper surface of each layer of stone, add reinforcing ribs to prevent the gabion cages from bulging; the reinforcing ribs are stainless steel wires, which must pass through the meshes of two or more gabion cages when binding; For two gabion cages, 45° oblique ribs shall be applied;

3) Backfilling behind the wall

First of all, in order to prevent the backfill source of the steep slope roadbed from infiltrating into the gabion cage with the water flow, after each layer of gabion cage is constructed, a reverse wall must be laid between the back of the gabion high retaining wall near the roadbed and the filling area. Filter non-woven geotextiles, and anti-filter non-woven geotextiles should be folded into a section of length m on the upper surface of each layer of gabion cages and the reinforcement mesh surface, and the value of m is 30cm;

Then, step by step from the edge to the middle, pave and compact the filler layer by layer on the reinforcement mesh surface, with a layer thickness of 20-30cm;

At the same time, the steep slope subgrade is filled in layers, and the backfill source is recycled spoil and excavation spoil, and natural fillers such as sand, gravel and clay are used as effective supplements;

(5) Process cycle

Repeat the construction process described in (4) until the backfilling of the Gabion high retaining wall and its wall reaches the design elevation;

During the construction process, the upper and lower layers of gabion cages should be staggered and fixed, so as to prevent through joints and horizontal displacement;

In order to keep the structure stable, for the high gabion retaining wall with a height of >12m, set up a platform every 6m height, so that the whole gabion retaining wall is divided into multi-level steps, and the slope of each level of gabion retaining wall is from bottom to top Gradual increase, the gabion cages are stacked according to the shape of the ladder to form a multi-level stepped gabion high retaining wall, and the slope of each level of the gabion high retaining wall increases from bottom to top;

(6) Surface greening of Gabion high retaining wall

After the construction of the gabion high retaining wall reaches the design elevation, according to the soil, climate and landscape requirements, the required grass species or shrub types are optimally determined, and the slope greening work is carried out as soon as possible: ① Spray and plant grass on the empty side of the gabion cage treatment; ② Lay planting bags in the vacant positions where the gabion cages overlap on each layer; ③ Carry out grass-shrub mixed planting greening slopes at the top slope of the gabion high retaining wall;

Further, the recycled materials described in step (1) are coarse aggregate, fine aggregate and fine-grained soil.

The beneficial effects of the present invention are mainly manifested in:

(1) Safe and stable

The combination of anti-slide piles and high gabion retaining wall can make the steep slope subgrade maintain permanent slope stability and operational safety.

(2) smooth drainage

The stone material in the gabion cage has good permeability, which can effectively relieve the static/dynamic water pressure, and overcome the inherent defect of seepage damage induced by the poor drainage of the reinforced retaining wall.

(3) Ecological and environmental protection

Vegetation bags can be laid on the top surface of the gabion cage, and grass can be sprayed and planted in the internal stone pores, which is beneficial to water and soil conservation, slope greening and ecological restoration, and has multiple functions such as economy, environmental protection and landscape.

(4) Fast construction

Gabion high retaining wall components have a high rate of finished products, on-site splicing and installation operations are simple and fast, and construction requirements are low (either fully mechanized construction or partially artificially assisted construction), which can effectively shorten the construction period.

Description of drawings

Fig. 1 is a structural schematic diagram of a gabion cage.

Fig. 2 is a construction state side view of construction according to the present invention.

Fig. 3 is the top view of the construction state of construction according to the present invention.

Figure 4 is a schematic diagram of the construction state of the reverse filter non-woven geotextile.

detailed description

With reference to the accompanying drawings, a method for jointly protecting steep slope subgrades with anti-slide piles and high gabion retaining walls comprises the following steps:

(1) Excavation and disposal of dregs to regenerate material sources at all levels

At the construction site of the steep slope subgrade, sorting, crushing and screening techniques are used sequentially to regenerate the excavated muck on site to obtain stone materials for filling gabion cages and backfill sources for steep slope subgrades. Filler sources include various recycled materials in different particle size ranges;

The stone material: requires hard texture, clean surface, certain durability, compressive strength not less than 30MPa, apparent density > 2.5g/cm ³ , porosity < 20%, particle size controlled at 12-30cm, material diameter The stone content greater than 30cm or less than 12cm is controlled between 4.5% and 5.5%;

The backfill source is designed using the Talbot gradation theory to obtain the material source required for backfilling the steep slope roadbed with continuous dense gradation, so as to achieve the purpose of reducing the void ratio and increasing the compaction degree, as well as controlling post-construction settlement;

(2) Construction of anti-slide pile 200

After completing the site leveling, pile position measurement and derrick installation preparations, the anti-slide pile 200 construction work can be officially carried out, including: underground pile hole excavation, pile body concrete pouring and ground pile construction;

1) Excavation of underground pile holes

①Lock

In order to ensure the stability of the underground pile hole opening, when the underground pile hole is dug to a depth of 2m, a C25 reinforced concrete locking wall with a wall thickness of 20cm±5cm is cast in the vertical form, and the top surface of the locking hole is flat and 55cm above the ground of the construction site ;

② Excavation and ballasting

Excavate the underground pile holes layer by layer from top to bottom, first dig the earthwork in the middle of the underground pile holes, and then expand to the boundary of the underground pile holes; manually load the ballast in the underground pile holes, then use the lifting equipment to transport the ballast, and put The ballast is transported to the storage yard for stacking; during the excavation of the underground pile hole, it is required to excavate the underground pile hole while retaining the wall, and the wall should be protected once every time the underground pile hole is dug into a depth of 2m;

③ retaining wall

Firstly, install the retaining wall steel form in the underground pile hole, and correct the position of the retaining wall steel form according to the central axis of the underground pile hole, and the overlap between the upper and lower two adjacent retaining walls is 50mm long; after the retaining wall steel form is installed, pour the retaining wall concrete, And remove the retaining wall steel mold after the strength of retaining wall concrete reaches the design strength;

2) Pile body concrete pouring

① Lowering the reinforcement cage: firstly, according to the design requirements, reinforce the reinforcement, tie and weld the reinforcement cage on the surface; finally, use the winch to put the reinforcement cage into the underground pile hole;

②Pouring concrete for pile body: Use string tube or crane to transport concrete to the underground pile hole, then pour concrete for pile body into the underground pile hole, pour concrete for pile body in layers, and the thickness of concrete for each layer of pile body after tamping is ≤ 30cm;

③ Pile Quality Inspection: After the pile body concrete and the steel cage form an underground pile, the quality of the underground pile is measured by a non-destructive method. Class III piles appear;

3) Ground pile construction

① Connect the pile head

First, break and clean the pile head of the underground pile; then, straighten and weld the vertical steel bars and stirrups in the pile head of the underground pile;

②Set up scaffolding

Both the length and width of the scaffold exceed the edge of the pile formwork on the ground by 2.0m, and the height of the scaffold exceeds the height of the pile formwork on the ground by 1.2m;

③Establish the reinforcement cage

The height of the above-ground pile is 6-8m; the steel cage of the above-ground pile is welded and formed at one time; the concrete of the above-ground pile is poured in batches, and the height of one-time pouring is 3.0m;

④Configuration template

In order to speed up the construction progress, 3 sets of pile templates are equipped, each set is 22m long (including two sections of 5m and 6m); the external pads of the pile reinforcement cage on the ground are used as a protective layer;

⑤Pouring concrete

The concrete is hoisted by a crane, and the concrete is continuously poured into the reinforcement cage of the above-ground piles to form the above-ground piles;

(3) Install concrete retaining board 300

Along the road direction d, several described anti-slide piles 200 are arranged at intervals according to the above steps (1)-(2). On the side of the anti-slide pile 200 near the steep slope subgrade, install prefabricated concrete retaining boards 300 in sections, and make the concrete The retaining plate 300 is connected into one;

(4) Construction of gabion high retaining wall

The piles on the ground and the top surface of the subgrade 500 surround the composite filling area 600, and the multi-level stepped gabion high retaining wall construction is carried out in the filling area 600;

1) Gabion cage installation

①Assembly of 100 gabion cages

Unfold the gabion cage 100, stretch the folds, and connect the gabion cage 100 with stainless steel wire fastening rings;

② 100 yards of gabion cage

Lay the gabion cage 100 in layers at the designated location; and correct the distortion when the gabion cage is 100 yards in size, and correct the folded size with a tape measure;

③ Gabion cage 100 connection

Use a bundled steel wire with a diameter of not less than 3.0mm and adopt a continuous winding method to connect each gabion cage 100 into a whole;

2) Gabion cage 100 filling

Fill the gabion cage 100 that has been placed with the stone material, and put the stone material in layers, and the thickness of each layer is 1/3 times the height of the gabion cage 100. In order to prevent the gabion cage from twisting and deforming, two adjacent gabion cages The height difference of the stone surface layer of the net cage 100 is ≤ 35cm; every layer of stone is put in, and manual tamping is carried out to ensure the compactness and flatness;

On the upper surface of each layer of stone, add reinforcing ribs to prevent the gabion cages from bulging; the reinforcing ribs are stainless steel wires, which must pass through the meshes of two or more gabion cages when binding; For the two gabion cages 100, 45° oblique reinforcing ribs shall be applied;

3) Backfilling behind the wall

First of all, in order to prevent the backfill source of the steep slope roadbed from infiltrating into the gabion cage with the water flow, after each layer of gabion cage is constructed, a reverse wall must be laid between the back of the gabion high retaining wall near the roadbed and the filling area. The filter non-woven geotextile 700, and the reverse filter non-woven geotextile 700 should be folded into a section with a length of m on the upper surface of each layer of the gabion cage and the reinforcement mesh surface 103, and the value of m is 30cm;

Then, step by step from the edge to the middle, pave and compact the filler layer by layer on the reinforcement mesh surface, with a layer thickness of 20-30cm;

At the same time, the steep slope subgrade is filled in layers, and the backfill source is recycled spoil and excavation spoil, and natural fillers such as sand, gravel and clay are used as effective supplements;

(5) Process cycle

Repeat the construction process described in (4) until the backfilling of the Gabion high retaining wall and its wall reaches the design elevation;

During the construction process, the upper and lower layers of gabion cages 100 should be staggered and fixed, so as to prevent through joints and horizontal displacement;

In order to keep the structure stable, for the high gabion retaining wall with a height of >12m, a platform a, b is set at every 6m height, so that the whole gabion retaining wall is divided into multi-level steps, and the slope of each gabion retaining wall is determined by Gradually increase from bottom to top, and the gabion cages 100 are stacked according to the ladder shape to form a multi-level stepped gabion high retaining wall, and the slope of each level of gabion high retaining wall increases from bottom to top;

(6) Greening of the surface of the Gabion High Retaining Wall

After the construction of the gabion high retaining wall reaches the design elevation, according to the soil, climate and landscape requirements, the required grass species or shrub types are optimally determined, and the slope greening work is carried out as soon as possible: ① spray seeding on the side of the gabion cage 100 Grass planting treatment; ② Lay planting bags in the vacant positions of the gabion cages 100 on each layer; ③ Carry out grass-shrub mixed planting greening slopes at the top slope of the gabion high retaining wall;

Further, the recycled materials described in step (1) are coarse aggregate, fine aggregate and fine-grained soil.

The gabion cage 100 is composed of a gabion mesh 101, a transverse partition 102, a reinforcement mesh surface 103 and a mesh cover 104: the gabion mesh 101 is erected vertically, and the folds caused by folding are stretched to smooth the gabion Mesh, first use the gabion mesh 101 to form a box shape with an open top on the tension mesh surface 103, then insert the transverse partition 102 in the gabion cage 100, and finally cover the upper cover 104, and the tension mesh surface 103 Extends horizontally outward for easy compaction.

The gabion high retaining wall is provided with a PVC drainage pipe 400 to facilitate drainage.

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present invention also includes those skilled in the art. Equivalent technical means conceivable according to the concept of the present invention.

Claims (2)

1. A method of anti-slide piles and gabion high retaining wall joint protection steep slope subgrade, is characterized in that: comprise the following steps: (1) Excavation and disposal of dregs to regenerate material sources at all levels At the construction site of the steep slope subgrade, sorting, crushing and screening techniques are used sequentially to regenerate the excavated muck on site to obtain stone materials for filling gabion cages and backfill sources for steep slope subgrades. Filler sources include various recycled materials in different particle size ranges; (2) Anti-slide pile construction After completing the site leveling, pile position measurement and derrick installation preparations, the anti-slide pile construction work can be officially carried out, including: underground pile hole excavation, pile body concrete pouring and ground pile construction; 1) Excavation of underground pile holes ①Lock In order to ensure the stability of the underground pile hole opening, when the underground pile hole is dug to a depth of 2m, a C25 reinforced concrete locking wall with a wall thickness of 20cm±5cm is cast in the vertical form, and the top surface of the locking hole is flat and 55cm above the ground of the construction site ; ② Excavation and ballasting Excavate the underground pile holes layer by layer from top to bottom, first dig the earthwork in the middle of the underground pile holes, and then expand to the boundary of the underground pile holes; manually load the ballast in the underground pile holes, then use the lifting equipment to transport the ballast, and put The ballast is transported to the storage yard for stacking; during the excavation of the underground pile hole, it is required to excavate the underground pile hole while retaining the wall, and the wall should be protected once every time the underground pile hole is dug into a depth of 2m; ③ retaining wall Firstly, install the retaining wall steel form in the underground pile hole, and correct the position of the retaining wall steel form according to the central axis of the underground pile hole, and the overlap between the upper and lower two adjacent retaining walls is 50mm long; after the retaining wall steel form is installed, pour the retaining wall concrete, And remove the retaining wall steel mold after the strength of retaining wall concrete reaches the design strength; 2) Pile body concrete pouring ① Lowering the reinforcement cage: firstly, according to the design requirements, reinforce the reinforcement, tie and weld the reinforcement cage on the surface; finally, use the winch to put the reinforcement cage into the underground pile hole; ②Pouring concrete for pile body: Use string tube or crane to transport concrete to the underground pile hole, then pour concrete for pile body into the underground pile hole, pour concrete for pile body in layers, and the thickness of concrete for each layer of pile body after tamping is ≤ 30cm; ③Pile quality inspection: After the concrete of the pile body and the steel cage form an underground pile, the quality of the underground pile is measured by a non-destructive method; 3) Ground pile construction ① Connect the pile head First, break and clean the pile head of the underground pile; then, straighten and weld the vertical steel bars and stirrups in the pile head of the underground pile; ②Set up scaffolding Both the length and width of the scaffold exceed the edge of the pile formwork on the ground by 2.0m, and the height of the scaffold exceeds the height of the pile formwork on the ground by 1.2m; ③Establish the reinforcement cage The height of the above-ground pile is 6-8m; the steel cage of the above-ground pile is welded and formed at one time; the concrete of the above-ground pile is poured in batches, and the height of one-time pouring is 3.0m; ④Configuration template In order to speed up the construction progress, the pile formwork is equipped; the external pads of the pile reinforcement cage on the ground are used as a protective layer; ⑤Pouring concrete The concrete is hoisted by a crane, and the concrete is continuously poured into the reinforcement cage of the above-ground piles to form the above-ground piles; (3) Install concrete retaining board Along the road direction, several anti-slide piles are arranged at intervals according to the above steps (1)-(2). On the side of the anti-slide piles close to the steep slope subgrade, install prefabricated concrete retaining boards in sections, and connect the concrete retaining boards into one; (4) Construction of gabion high retaining wall The piles on the ground and the top surface of the subgrade form a filling area, and the multi-level stepped Gabion high retaining wall construction is carried out in the filling area; 1) Gabion cage installation ① Gabion cage assembly Expand the gabion cage, stretch the folds, and connect the gabion cage with a stainless steel wire buckle ring; ② Gabion cage code construction Lay the gabion cages in the designated position in layers; and correct the distortion and deformation when the gabion cages are stacked, and correct the folded size; ③ Gabion cage connection Use the bundled steel wire with a diameter of not less than 3.0mm to connect each gabion cage into a whole by continuous winding method; 2) Gabion cage filling Use the stones to fill the stacked gabion cages, and put the stones in layers. The thickness of each layer is 1/3 times the height of the gabion cages. In order to prevent the gabion cages from twisting and deforming, two adjacent gabion cages The height difference of the surface layer of stone materials is ≤35cm; each layer of stone materials is put in and adjusted by manual tamping to ensure the compactness and flatness; On the upper surface of each layer of stone, add reinforcing ribs to prevent the gabion cages from bulging; the reinforcing ribs are stainless steel wires, which must pass through the meshes of two or more gabion cages when binding; For two gabion cages, 45° oblique ribs shall be applied; 3) Backfilling behind the wall First of all, in order to prevent the backfill source of the steep slope roadbed from infiltrating into the gabion cage with the water flow, after each layer of gabion cage is constructed, a reverse wall must be laid between the back of the gabion high retaining wall near the roadbed and the filling area. Filter non-woven geotextiles, and anti-filter non-woven geotextiles should be folded into a section of length m on the upper surface of each layer of gabion cages and the reinforcement mesh surface, and the value of m is 30cm; Then, step by step from the edge to the middle, pave and compact the filler layer by layer on the reinforcement mesh surface, with a layer thickness of 20-30cm; At the same time, the steep slope subgrade is filled in layers, and the backfill source is recycled spoil and excavation spoil, and natural fillers such as sand, gravel and clay are used as effective supplements; (5) Process cycle Repeat the construction process described in (4) until the backfilling of the Gabion high retaining wall and its wall reaches the design elevation; During the construction process, the upper and lower layers of gabion cages should be staggered and fixed, so as to prevent through joints and horizontal displacement; In order to keep the structure stable, for the high gabion retaining wall with a height of >12m, set up a platform every 6m height, so that the whole gabion retaining wall is divided into multi-level steps, and the slope of each level of gabion retaining wall is from bottom to top Gradual increase, the gabion cages are stacked according to the shape of the ladder to form a multi-level stepped gabion high retaining wall, and the slope of each level of the gabion high retaining wall increases from bottom to top; (6) Greening of the surface of the Gabion High Retaining Wall After the construction of the gabion high retaining wall reaches the design elevation, according to the soil, climate and landscape requirements, the required grass species or shrub types are optimally determined, and the slope greening work is carried out as soon as possible: ① Spray and plant grass on the empty side of the gabion cage Treatment; ② Lay planting bags in the vacant positions where the gabion cages overlap on each layer; ③ Carry out grass-shrub mixed planting greening slopes at the top slope of the gabion high retaining wall. 2. the method for a kind of anti-slide pile and gabion high retaining wall joint protection steep slope subgrade as claimed in claim 1, is characterized in that: the recycled material described in step (1) is coarse aggregate, fine aggregate and fine-grained soil.