JP2018178679A - Method for producing water shielding earth, and water shielding earth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide water shielding earth having features such as great earth-tightening strength, a sufficient water shielding effect, hardness to the extent where its surface will not be removed from rainwater and the like, environmental friendliness and easy availability, as a material used in a repair construction due to deterioration, a levee raising construction for increasing the amount of pondage, a maintenance constriction for preventing breakdown of a levee or the like in "ponds", "reservoirs" and the like constructed for agriculture etc.SOLUTION: A method for producing water shielding earth that has plasticity suitable for workability of leveling and rolling compaction, and in which the bond between grains is strengthened by mixing decomposed granite soil with 22 mm or less in grain diameter and particles with 0.075 mm or less in grain diameter obtained from granite ground objects in a predetermined proportion to provide a granularity configuration with high density that can demonstrate a water shielding function. Furthermore, functions of the water shielding earth are improved by utilizing "Tataki" technique, which is a Japanese traditional technique, to mix an appropriate amount of slaked lime.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an embankment material for reservoirs and reservoirs, an edged metal soil for a water-impervious material, and a method of manufacturing the same.

  In the “water reservoir” artificially created to secure agricultural water, and in the “reservoir” which is a water source for daily life, dikes develop over a long period of time, preventing collapse of dikes and embankments, etc. Repair work to prevent erosion and leakage is required. In addition, maintenance work such as raising the levee of the dike may be necessary in order to increase the storage volume. (There are about 200,000 ponds throughout the country.) These ponds and reservoirs are habitats for a wide variety of organisms, and contribute to the preservation of the rich natural environment in the surrounding area.

  In general, blade metal soil used for embankment work such as reservoirs and reservoirs is sand and earth generated in restoration work, sediment and ponds deposited on the bottom of reservoirs, and soil and sand generated in earth and sand mining areas around the construction site Is used. In order to improve the water blocking performance of these soils, a method of adding cement as a bentonite having a water leakage effect or a solidifying material has been put to practical use.

  However, sedimentary clay and earth and sand generated at the construction site may contain organic substances and harmful metals. If the amount of cement used as the solidifying material is too large, the pH of the mixed soil may be increased to adversely affect the surrounding environment, and the cost of construction may be increased.

  It is necessary to secure the land and continue legally until mining, providing newly discovered soils and rocks suitable for cutting metal soil, and providing them in a short time. It can not be done, and there are problems such as being connected to natural destruction.

  On the other hand, granite-derived true sand soils produced in various parts of Japan are clays formed by weathering quartz and feldspar (such as orthoclase and microclastic feldspar) and a small amount of colored minerals (biotite, magnetite, amphibole etc) and feldspar. Although it is composed of minerals, it is difficult to keep the quality of the edge gold soil constant because the combination of minerals is different depending on the distribution area and the collection place, and the particle size, soil strength and permeability are different depending on the weathering degree. It is.

  In addition, marshy soil generally has a permeability coefficient often greater than 1 × 10 −3 cm / sec, and has permeability. It is necessary to reinforce it with other materials, since it can not be used as a revetment embankment material and a water blocking material for reservoirs and reservoirs with pure sand soil alone.

  As a method to solidify marss soil, the technology has been passed on to make artificial stone with marss soil and slaked lime which has been said to be "Tataki" (Sanwa soil) since ancient times in Japan. If this technology is applied to blade-metal construction, it can be improved to a more geotechnically superior blade-metal soil.

Patent document 1: JP-A-2005-120636 Patent Document 1: Japanese Patent Application Publication No. 2005-325616 Patent Document 1: Japanese Patent Application Publication No. 07-051698 JP, 2014-55433, A JP, 2012-41679, A JP, 2006-214145, A

  In general, problems when using marshal soil as cutting metal soil are that particle size, soil strength and water permeability differ depending on the degree of weathering, high water permeability and poor water blocking effect, caking property There is almost no malleability.

  In addition, it is difficult to secure stable quality of conventional bladed metal soil manufactured based on weathered granite.

  The present invention is intended to solve the above-mentioned problems, and the object thereof is to manufacture a high quality and constant quality edged metal soil for use as a revetment embankment material and a water blocking material for reservoirs and reservoirs. Provided is a method and edge metal soil.

Means for the Invention to be Solved

  The present invention relates to a method for producing bladed metal soil, and a fine particle fraction of particle size of 0.075 mm or less generated in a process of producing fine aggregate from granite in marshal soil in which the particle size of contained minerals is adjusted to 22 mm or less. It is characterized in that it is manufactured by blending and stirring at a constant ratio.

  In addition, in the method of producing the edged gold soil, the mixing ratio of the true sand soil and the fine particle content is characterized in that the fine sand content falls within the range of 1.7 to 1.8 for the fine particle content 1 in weight ratio.

  Further, the present invention provides, in blade metal soil, a weight ratio of true sand soil having a particle size of contained minerals of 22 mm or less and fine particles having a particle size of 0.075 mm or less obtained in the process of producing fine aggregate from granite. And the fine sand content is mixed at a ratio of 1.7 to 1.8 with respect to 1.

  In addition, in bladed metal soil, the particle size composition of the material in which true sand soil and fine particles are mixed contains 25 to 26% by weight of sand and sand, 41 to 43% by weight of silt, and 7 to 8% by weight of clay. The water content is 25 to 26% by weight.

  In addition, in edge metal soil, when added slaked lime to true sand soil and fine particles to make the whole 100% by weight, the total content of true sand soil and fine particles is 85 to 95% by weight, and the content rate of slaked lime is 15 To 5% by mass.

Effect of the invention

  In the present invention, the amount of clay mineral contained and the particle size composition are calculated based on the fine particle fraction generated in the process of roughly grinding true sand soil and granite produced from weathered granite with adjusted particle size composition and producing artificial sand. It is an object to provide an edged metal soil which is adjusted and manufactured so as to be finely packed. The edged metal soil of the present invention is characterized in that the quality such as compressive strength after spreading pressure and rolling pressure and water permeability is higher in performance and stable in quality as compared with the conventional product. The present invention provides a blade-metal soil which solves various problems of blade-metal soil which has been prepared and provided according to the experience of the skilled person.

  The amount of fine particles generated in the step of washing with water and classification in the manufacturing process of artificial silica sand (fine aggregate) accounts for 20 to 18% by weight of granite or true sand. Fines (such as silt and clay) dehydrated by the filter press are usually backfilled in granite and marshy mined pits as residual soil. The present invention is the recycling of this residual soil.

  In addition, the beach sand which becomes a fine aggregate naturally produced is dug down almost, and artificial silica sand is manufactured in various places. In Japan, granite is widely distributed, and it can be easily obtained anytime and anywhere, and it is characterized that it leads to the reduction of construction costs.

  The blade metal soil of the present invention is manufactured by mixing a fine sand soil widely produced in Japan and a fine particle component generated in a process of manufacturing artificial silica sand from granite. It has an excellent function to prevent leakage, is useful for natural earth-friendly edged earth, and is characterized by the fact that raw materials can be obtained relatively easily.

  The fine particles generated in the process of producing artificial siliceous sand are conventionally backfilled in the mineds of true sand soil as residual soil, and being used as a part of cutting metal earth material is an effective use of resources, and artificial siliceous sand manufacturing It is a great benefit to the industry.

  In the case of adding a small amount of slaked lime to cutting metal soil, slaked lime adsorbs and solidifies carbon dioxide gas in the atmosphere, and it is thought that it contributes to the preservation and improvement of the atmosphere environment because the soil strength is increased. In addition, the use of this cutting edge can reduce construction costs, so it can be said to be an advantageous material for both society and companies.

It is process drawing which manufactures edge metal soil from granite. Powder X-ray diffraction diagram of marshy soil (symbols in the figure indicate each identified mineral). The powder X-ray-diffraction figure of the microparticles | fine-particles part generate | occur | produced during artificial silica sand manufacture (the symbol in a figure shows the identified mineral, respectively). The heat loss curve of the fine particles generated during the production of true sandy soil and artificial silica sand. It is a figure which shows the example of use of a levee embankment material and a water blocking material.

  The production line of edged metal soil will be specifically described according to FIG. Granite and weathered granite (1) mined at the mining site are crushed in stages by the primary crusher (7) and secondary crusher (8) installed at the mining site, and the size is made constant with the sorter (9a) Prepare, wash with water and classify (10). Crushed stone obtained by washing and classification (hereinafter referred to as “artificial silica stone”) is shipped to the market as fine aggregate (5). On the other hand, the turbid water generated by water washing is subjected to solid-liquid separation processing in the settling tank (11), and the precipitate generated at the bottom of the settling tank is dewatered and solidified by the filter press (12), and received as a fine particle (4) hopper (13a) Stock).

  The true sandy soil is adjusted to a particle size of 22 mm or less by a sorting machine (9b) and stocked in a dedicated receiving hopper (13b) for true sandy soil.

  In order to improve marss soil to an edged metal soil with excellent functions, the compounding ratio of marss soil to fine particles is the most important factor, and in order to determine it, "sieving test" for marss soil And heat loss measurement, heat loss measurement is performed also for fine particles, and the clay mineral content is estimated. From these measured values, the compounding ratio of true sand and fine particles is calculated, and a test sample is prepared based on the compounding ratio to confirm caking property, adhesion, dry strength and the like.

  In other words, the amount of clay mineral contained in the fine sand generated during the manufacture of the true sand soil and the artificial siliceous sand by the above-described method by sampling small amounts of the fine sand soil and fine particles respectively stocked in the respective receiving hoppers (13) Estimate Based on that value, the blending ratio is calculated.

  As a result of determining the particle size composition of true sand soil and fine particles by sieving test and particle size test by hydrometer, the particle size composition of true sand soil having a moisture content of 12.5% by weight is found to be sand and sand (22-0.075 mm) Approximately 70% by weight, 14.9% by weight of silt and 2.6% by weight of clay. On the other hand, the particle size configuration of fine particles having a water content of 32.5% by weight is 57.4% by weight of silt and 10.1% by weight of clay. In addition, each weight% of the said particle size component is a weight% at the time of making the fine sand soil containing a water | moisture content or a fine particle part into 100%.

  As a result of intensively studying the caking property, adhesion and dry strength of the test sample prepared by mixing and stirring the maus sand soil and the fine particle content at an arbitrary blending ratio, against the fine particle content 1 of the moisture content 32.5% by weight It has been found that a material containing 1.7 to 1.8 weight proportions of true sandy soil having a moisture content of 12.5% by weight is suitable as an edge metal soil.

  The particle size configuration and the water content of the edged gold soil prepared by mixing 1.7% and 1.8% by weight of true sandy soil with a moisture content of 12.5% by weight to the fine particle fraction 1 with a moisture content of 32.5% by weight are as follows: As it is.

  Incidentally, although the powder X-ray diffraction pattern of the true sand soil in FIG. 2 and the powder X-ray diffraction pattern of the fine particles generated during production of the artificial silica sand in FIG. The clay minerals contained in the fine particles are kaolinite, smectite and mica clay minerals.

  The amount of clay mineral (kaolinite, smectite, mica clay mineral) contained in marss soil and fine particles is estimated from the amount of crystal water contained in the clay mineral. That is, since the crystal water is released between approximately 400 and 800 ° C. when the clay mineral is heated, the clay content was estimated from the weight loss in that temperature range. See FIG.

  Slaked lime is added to the edged metal soil shown in 0031 to enhance the water blocking performance and the compaction strength. In the construction, it is possible to adjust the water content so that appropriate viscosity, malleability, adhesion and plasticity can be exhibited.

  The fine particles and the sand soil generated during the production of artificial silica sand are compounded (14) at a compounding ratio of 1: 1.7 to 1: 1.8, and stirred so as to be uniform with a stirrer (15) while adjusting the water content It is set as edge metal soil (6).

  In the case of construction where the strength of the soil is required for the edged metal soil described in 0034, the slaked lime (3) is compounded in an appropriate amount (14) from the slaked lime supply machine (16) and stirred and mixed with the agitator (15) Earth (6).

  Table 1 shows the moisture content and the particle size configuration of the true sand soil and fine particles used for the test. Table 2 shows the blend ratio of the test sample in which fine particles and true sand are mixed at a ratio of 1: 1.7 to 1: 1.8 and the test sample to which slaked lime is further added.

  Table 3 shows the measurement results of the maximum particle size, the particle size configuration, the true specific gravity, the dry density, the water content, and the number of water transmissions of three test bodies.

  The maximum dry density of sandy soil on natural ground is said to be 1.7 to 1.8, 1.9 in the case of earth-sedimentary soil, and around 1.8 in the case of cohesive soil. Each test sample showed values almost similar to sandy soil and sandy soil on natural ground.

  With regard to the optimum moisture content, the test pieces 2 and 3 showed small but large values. The permeability coefficient, which is the most important function of the reservoir surface of the “Ikeike”, “reservoir”, and the inner edge of the blade, and the protection of the surface of the levee, has greatly improved with both edges of the metal. Show that they can perform useful functions.

  Table 4 shows the results of triaxial compression test of edged gold soil manufactured by compounding (1: 1.7 to 1: 1.8) fine particles and true sand soil described in 0035, edged metal edge to which slaked lime is further added Table 5 shows the results of the triaxial compression test. With this blade, it is possible to compact the soil hard by repeated rolling, and no cracks are found after drying, and the selection criteria for the embankment material is cleared.

  The blade metal soil according to the present invention is produced by mixing marshal soil widely produced in Japan with fine particles (0.075 mm or less) generated in the process of producing artificial silica sand from granite. It has an excellent function to repair, reinforce and prevent water leakage, and it is a naturally soft edged metal soil, and it is characterized by the fact that raw materials can be obtained relatively easily.

  The fine particles (0.075 mm or less) generated in the process of producing artificial silica sand are conventionally backfilled in the mining trace of true sand soil as residual soil, and utilization as a part of cutting metal earth material is an effective resource This is a great advantage for the artificial sand manufacturing industry.

  In the case of adding a small amount of slaked lime to cutting metal soil, slaked lime adsorbs and solidifies carbon dioxide gas in the atmosphere, and it is thought that it contributes to the preservation and improvement of the atmosphere environment because the soil strength is increased. In addition, since the use of main blade metal soil can reduce construction costs, it can be said to be an advantageous material for both society and companies.

DESCRIPTION OF SYMBOLS 1 Granite, weathered granite 2 Masu sand soil 3 Slaked lime 4 Fine particles 5 Fine aggregate 6 Edge metal soil 7 Primary crusher 8 Secondary crusher 9 a Sorting machine 9 b Sorting machine 10 Water washing and classification 11 Sedimentation tank 12 Filter-Press 13a Receiving popper 13b Receiving hopper 14 Formulation 15 Agitator 16 Slaked lime feeder 51 Water blocking zone (cohesive soil)
52 Reservoir 53 Foundation Ground 54 Semi-permeable or Permeable Material (Tyado soil)
55 Semi-permeable or water-permeable material (moulding)

Claims (5)

  A blade produced by mixing and stirring fine particles of particle size 0.075 mm or less generated in the process of producing fine aggregate from granite in a true sand soil in which the particle size of contained minerals is adjusted to 22 mm or less. How to make gold soil.   The method for producing edged gold soil according to claim 1, wherein the mixing ratio of the true sand soil and the fine particle content falls within the range of 1.7 to 1.8 for the fine sand content to 1 for the fine particle content by weight ratio.   True sand soil with a particle size of 22 mm or less of contained minerals, and fine particles with a particle size of 0.075 mm or less obtained in the process of producing fine aggregate from granite, true sand soil is 1 part by weight of fine particles Blade-green soil mixed at a ratio of 1.7 to 1.8.   The particle size composition of the material mixed with marss soil and fine particles is 25 to 26% by weight of sand and sand, 41 to 43% by weight of silt, 7 to 8% by weight of clay and 25 to 26% by weight of water content The blade according to claim 3, which is   When slaked lime is added to marshal soil and fine particles, and the total is 100% by weight, the total content of marshal soil and fine particles is 85 to 95% by weight, and the slaked lime content is 15 to 5% by weight. The blade metal soil according to Item 3 or 4.

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