CN117908107A - Verification method based on inversion algorithm of geologic structure dynamic adjustment model - Google Patents

Abstract

The invention discloses a verification method based on an inversion algorithm of a geological structure dynamic adjustment model. The method comprises the following steps: firstly making a truncated cone mold and a sedimentary rock mass mold; the interior of the truncated cone mold comprises a truncated cone structure; making a prefabricated structure sheet or a wax sculpture and placing it on the truncated cone mold at a fixed angle; casting a non-expanding material in layers or as a whole in the truncated cone mold and heating it, and then taking the truncated cone structure out of the truncated cone mold; placing the truncated cone structure in the sedimentary rock mass mold and casting the non-expanding material in layers; heating and demoulding the sedimentary rock mass mold; emitting active seismic sources at different positions on one side of the sedimentary rock mass and receiving waveform arrays on other sides to invert the sedimentary rock mass to obtain an inversion result; and calculating a result deviation according to the inversion result to verify the inversion result, so as to greatly reduce the time and cost of making verification samples.

Description

Verification method of inversion algorithm based on geological structure dynamic adjustment model

Technical Field

The invention relates to the field of mining engineering, and in particular to a verification method for an inversion algorithm based on a geological structure dynamic adjustment model.

Background technique

At present, in the detection of hidden disaster-causing factors in the field of mining engineering, algorithm optimization methods for inverting geological structures using rock mass vibration signals are emerging in an endless stream, especially as artificial intelligence algorithms become more mature, more inversion algorithms will be born. However, the accuracy and robustness of these algorithms are often very expensive to verify based on field conditions alone, and some are even difficult to accept (if false detections occur and safety accidents occur). Therefore, laboratory methods can usually be used for simulation verification, but customizing models of geological structure conditions at multiple laboratory scales is time-consuming and labor-intensive, and it is difficult to use a large number of different types of geological bodies to verify the robustness and effectiveness of the algorithm.

At present, in the geological structure inversion work, there are many algorithms that need to be verified before they can be applied on site. However, the data available for verification on site is limited and the cost of active verification is very high (on-site drilling and other work are required, which seriously affects production. If the verification is waiting for engineering excavation, the waiting time is too long, and there may not be a few data in a year). How to scientifically and effectively evaluate the robustness and accuracy of the geological structure inversion algorithm requires the use of experimental means to verify with a large number of known samples. In the prior art, the on-site judgment of structural cracks is generally determined by the abnormal area of the wave velocity field, and the laboratory inversion wave velocity field is generally carried out through acoustic emission experiments, and then the acoustic emission experiment is verified by prefabricating cracks with known distribution. Usually, the workload of prefabricating cracks is extremely large, and it often requires special equipment and combined with special crack pieces to be cast. However, if a large number of test samples need to be made, the sample preparation workload is large and very time-consuming.

Summary of the invention

The present invention provides a verification method based on a geological structure dynamic adjustment model inversion algorithm, which can solve the problem in the prior art that a large number of test samples need to be prepared, resulting in a large workload and great time consumption in sample preparation.

The verification method of the inversion algorithm based on the geological structure dynamic adjustment model in the present invention comprises:

Making a truncated cone mold and a sedimentary rock mold; the interior of the truncated cone mold includes a truncated cone structure extending from the top of the truncated cone mold through the bottom; the sedimentary rock mold is used to obtain a simulated sedimentary rock;

Making a prefabricated structural piece or a wax sculpture and placing it on the truncated table mold at a fixed angle;

After pouring the non-expandable material in layers or as a whole into the truncated cone mold and heating it, the truncated cone structure is taken out from the truncated cone mold;

Placing the truncated cone structure in the sedimentary rock mass mold and pouring the non-expanding material in layers;

The sedimentary rock mass mold is heated and demoulded so as to separate the sedimentary rock mass and the sedimentary rock mass mold;

transmitting active seismic sources at different positions on one side of the sedimentary rock mass and receiving waveform arrays on other sides to invert the sedimentary rock mass to obtain inversion results;

The result deviation is calculated according to the inversion result to verify the inversion result.

Optionally, the upper surface area of the truncated cone structure is larger than the lower surface area, and the truncated cone structure is inclined to the truncated cone mold.

Optionally, the method further comprises: preparing a plurality of non-expandable materials, wherein the plurality of non-expandable materials have different densities and elastic moduli.

Optionally, the method further comprises: pouring the non-expandable material in layers into the sedimentary rock mass mold to form sedimentary rock masses of various densities.

Optionally, making the prefabricated structural piece includes:

A prefabricated sheet of metal or plastic with known dimensions is coated with a thin layer of hot paraffin and allowed to dry to form an extremely thin isolation surface.

Optionally, after pouring the non-expandable material in layers or as a whole into the truncated cone mold and heating it, the method further comprises:

When the heating temperature exceeds the melting point of the paraffin wax, the prefabricated structural piece is taken out or the truncated table is inverted to allow the paraffin wax sculpture to melt and flow out.

Optionally, before placing the truncated cone structure in the sedimentary rock mass mold, the method further comprises:

A layer of paraffin solution is hot-coated on the side surface of the truncated cone structure and the inner side of the sedimentary rock mass mold, and after the paraffin solution is cooled, the truncated cone structure is placed in the sedimentary rock mass mold.

Optionally, calculating the result deviation according to the inversion result to verify the inversion result includes:

Preset spatial grids with different resolutions and set the original velocity field S _i,j,k for each grid, obtain the inverted velocity field v _i,j,k , and calculate the result deviation D.

Where: S _i,j,k is the average wave velocity of the i-th grid in the x direction, the j-th grid in the y direction, and the k-th grid in the z direction when the original wave velocity field is divided into i*j*k grids in the x, y, and z coordinate axes respectively;

v _i,j,k is the average wave velocity of the i-th grid in the x-direction, the j-th grid in the y-direction, and the k-th grid in the z-direction when the inverted wave velocity field is divided into i*j*k grids in the directions of the three coordinate axes x, y, and z respectively.

Optionally, the method further includes:

The frustum structure is rotated at a certain azimuth angle and inverted to obtain a plurality of inversion results and a plurality of result deviations.

The present invention also includes a computer-readable storage medium, wherein the computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps of any of the methods described above.

The present invention prefabricates a truncated cone-shaped replaceable structure and simultaneously casts multiple layers of non-expansion rock blocks of different densities, which can not only simulate the heterogeneity of sedimentary rock geological bodies, but also effectively reduce the casting cost by replacing or rotating the structure, thereby greatly reducing the time and cost of making verification samples.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a flow chart of a verification method of an inversion algorithm based on a geological structure dynamic adjustment model according to an embodiment of the present invention;

FIG2 is a schematic structural diagram of a truncated cone mold according to an embodiment of the present invention;

FIG3 is a schematic diagram of the structure of a sedimentary rock mold in an embodiment of the present invention;

FIG4 is a schematic diagram of the placement of prefabricated structural pieces in an embodiment of the present invention;

FIG5 is a schematic diagram of pouring in an embodiment of the present invention;

FIG. 6 is a schematic diagram of an inversion test after pouring in an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

It should be understood that in the various embodiments of this document, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this document.

The embodiment of the present invention provides a verification method based on a geological structure dynamic adjustment model inversion algorithm, as shown in FIG1 , the method includes:

Step 100, making a truncated cone mold and a sedimentary rock mold; the interior of the truncated cone mold includes a truncated cone structure that runs from the top of the truncated cone mold to the bottom; the sedimentary rock mold is used to obtain a simulated sedimentary rock, as shown in Figure 2. Specifically, the truncated cone mold can be made of stainless steel or PVC and other materials that can be maintained for a long time without deformation. The middle of the truncated cone structure is empty. The sedimentary rock mold is shown in Figure 3, and its material can also be made of stainless steel or PVC and other materials that can be maintained for a long time without deformation. The function of the sedimentary rock mold is to cast non-expanding materials of different materials, and to form sedimentary rock masses of different densities through layered casting at different times.

Step 200, make a prefabricated structural piece or a paraffin wax sculpture, and place it on the truncated cone mold at a fixed angle. Specifically, a prefabricated structural piece of known size of metal or plastic is coated with a thin layer of hot paraffin wax, and the prefabricated structural piece is made after it is dried to form an extremely thin isolation surface. The paraffin wax sculpture is used to simulate a special-shaped non-section structure. Then, the prefabricated structural piece coated with a thin layer of paraffin wax or the special-shaped paraffin wax sculpture is directly placed on the truncated cone mold at a fixed angle, as shown in Figure 4.

Step 300, after the non-expandable material is poured in layers or poured as a whole into the truncated cone mold and heated, the truncated cone structure is taken out from the truncated cone mold. Specifically, first use a brush to lightly brush a thin layer of hot paraffin solution on the inside of the membrane, and after the paraffin returns to room temperature and solidifies, the non-expandable material is poured in layers or as a whole into the truncated cone mold as needed. After the non-expandable material solidifies and dries, it is placed in a high-temperature box for heating and demoulding. After the temperature exceeds the melting point of the paraffin, the truncated cone structure is taken out of the truncated cone mold as a whole, and the prefabricated structural piece is taken out at the same time, or the truncated cone is turned upside down to allow the special-shaped paraffin sculpture to melt and flow out. The non-expandable material is poured in layers or poured as a whole into the truncated cone mold to ensure that the material does not expand and cause interface deformation.

Step 400, placing the truncated cone structure in the sedimentary rock mold and pouring the non-expanding material. Specifically, a thin layer of hot paraffin solution is first lightly brushed on the side of the truncated cone structure and the inner side of the sedimentary rock mold, and after cooling, the truncated cone structure is placed in the sedimentary rock mold as needed, and the non-expanding material is poured. A plurality of truncated cone structures can be prefabricated as needed and the space presents different arrangements, as shown in FIG5, including two truncated cone structures, but the number of truncated cone structures is not limited to those listed in the embodiment of the present invention.

Step 500, heating and demoulding the sedimentary rock mold so as to separate the sedimentary rock mass from the sedimentary rock mold. Specifically, heating and demoulding the sedimentary rock mold can separate the entire sedimentary rock mass from the sedimentary rock mold, separate the truncated cone structure from the sedimentary rock mass, and clean the paraffin separation interface.

In a preferred embodiment, if it is necessary to simulate the influence of groundwater, water can be injected to fill the crack cavity, so as to reflect the influence of simulated groundwater on wave propagation.

Step 600, active seismic sources are emitted at different positions on one side of the sedimentary rock mass and waveform arrays are received on other sides to invert the sedimentary rock mass to obtain inversion results. Specifically, as shown in FIG6 , a source exciter is placed on one side of the separated sedimentary rock mass to emit active seismic sources with known waveforms at different positions, and at the same time, acoustic emission sensors are arranged on other sides according to the algorithm test requirements to receive waveform arrays, and then the received waveform arrays can be used to invert the sedimentary rock mass.

Step 700, calculate the result deviation degree according to the inversion result to verify the inversion result. Specifically, according to the algorithm accuracy requirements, design spatial grids with different resolutions, set different original wave velocity fields for each grid, use different inversion models to invert the waveform array received by the acoustic emission sensor, and obtain the inverted wave velocity field. Calculate the result deviation degree of the inversion model according to the original wave velocity field and the inverted wave velocity field, and the inversion result can be verified by the result deviation degree.

The method described in the above embodiment of the present invention can not only simulate the heterogeneity of sedimentary rock geological bodies by prefabricating truncated cone-shaped replaceable structures and simultaneously casting multiple layers of non-expandable materials with different densities, but also effectively reduce the casting cost by replacing or rotating the structures, thereby greatly reducing the time and cost of making verification samples.

In a preferred embodiment of the present invention, the upper surface area of the truncated cone structure is larger than the lower surface area, and the truncated cone structure is inclined to the truncated cone mold. The truncated cone structure has an inclined surface inclination angle, and the angle of the inclined surface inclination angle is about 80 degrees.

In a preferred embodiment of the present invention, the method further comprises: modulating a plurality of non-expanding materials, wherein the plurality of non-expanding materials have different densities and elastic moduli. Specifically, by using different grades of cement, standard sand, fly ash and water to modulate non-expanding materials of different densities and elastic moduli, sedimentary rocks with different wave velocities can be simulated. If cement and water are simply used for pouring, shrinkage will occur after solidification. By adding appropriate amounts of expansion agents and foaming agents, the density and Poisson's ratio can be adjusted and the solidification shrinkage characteristics can be offset. The modulated non-expanding materials of different densities and elastic moduli are subjected to wave velocity tests, and non-expanding materials with large wave velocity differences are selected for classification and labeling, and used for subsequent pouring.

In a preferred embodiment of the present invention, the method further comprises: pouring the non-expanding material in layers into the sedimentary rock mass mold to form sedimentary rock masses of various densities. Specifically, non-expanding materials of different densities and elastic moduli are poured in layers as needed. During the pouring process, the upper layer of material needs to wait until the lower layer is fully solidified before pouring. By pouring non-expanding materials of different densities in layers, the on-site sedimentary rock strata geological body can be simulated to achieve the distinction of wave propagation speeds in different media. The experimental geological body can reflect the algorithm inversion error caused by the refraction phenomenon caused by different rock strata densities in the real site, and can more accurately evaluate the effectiveness of the algorithm to be tested.

In a preferred embodiment, in order to facilitate the rotation of the truncated cone structure, the height of the sedimentary rock mass should be smaller than the height of the truncated cone structure to ensure that the orientation of the truncated cone structure can be easily lifted and rotated, and the orientation of the internal structure can be conveniently determined by marking the azimuth angle on the upper surface of the truncated cone structure.

In a preferred embodiment of the present invention, making the prefabricated structural piece includes:

A thin layer of hot paraffin or oil is applied to the surface of a prefabricated structural sheet of known size of metal or plastic, and then dried to form an extremely thin isolation surface. In the above embodiment of the present invention, the casting prefabrication is performed in a form in which the top circular area is larger than the bottom circular area, and the surface is isolated by evenly applying paraffin liquid or oil to ensure that the entire truncated cone structure can be easily separated from the sedimentary rock mass or the truncated cone mold when the lower part of the truncated cone body is pressed upward.

In a preferred embodiment, the prefabricated structural piece or the wax sculpture is fixed in the truncated cone structural body by a clamp, and then

In a preferred embodiment of the present invention, after the non-expanding material is poured in layers or as a whole into the truncated cone mold and heated, the method further comprises:

When the heating temperature exceeds the melting point of the paraffin wax, the prefabricated structural piece is taken out or the truncated table is inverted to allow the paraffin wax sculpture to melt and flow out.

In a preferred embodiment of the present invention, before placing the truncated cone structure in the sedimentary rock mass mold, the method further comprises:

A layer of paraffin solution is hot-coated on the side surface of the truncated cone structure and the inner side of the sedimentary rock mass mold, and after the paraffin solution is cooled, the truncated cone structure is placed in the sedimentary rock mass mold.

In a preferred embodiment of the present invention, calculating the result deviation according to the inversion result to verify the inversion result includes:

Preset spatial grids with different resolutions and set the original velocity field S _i,j,k for each grid, obtain the inverted velocity field v _i,j,k , and calculate the result deviation D.

Where: S _i,j,k is the average wave velocity of the i-th grid in the x direction, the j-th grid in the y direction, and the k-th grid in the z direction when the original wave velocity field is divided into i*j*k grids in the x, y, and z coordinate axes respectively;

v _i,j,k is the average wave velocity of the i-th grid in the x-direction, the j-th grid in the y-direction, and the k-th grid in the z-direction when the inversion wave velocity field is divided into i*j*k grids in the directions of the three coordinate axes x, y, and z. Specifically, when setting the original wave velocity field for each grid, the original wave velocity field can be directly set according to the results of the previous non-expansive material wave velocity test.

In a preferred embodiment of the present invention, the method further comprises:

The truncated cone structure is rotated at a certain azimuth angle and inverted to obtain multiple inversion results and multiple result deviations. Specifically, in order to avoid the algorithm from overfitting a single structure, in a preferred embodiment, the truncated cone structure is lifted and the truncated cone structure is rotated at a certain azimuth angle, and step 700 is repeated to obtain a new result deviation. Adjusting the orientations of multiple truncated cone structures in this way can produce several different spatial structure combinations, obtain multiple combination errors, and select an algorithm with low combination errors and stable fluctuations with combination changes. In an embodiment of the present invention, a large number of laboratory-scale geological body combinations with different structures are quickly obtained by prefabricating multiple truncated cone structures and rotating the truncated cone structures at different azimuth angles, thereby saving a lot of casting and sample preparation time, thereby more scientifically and effectively verifying the accuracy of the algorithm.

An embodiment of the present invention also includes a computer-readable storage medium, which stores one or more programs. The one or more programs can be executed by one or more processors to implement the steps of any of the methods described above.

The method described in the embodiment of the present invention prefabricates replaceable truncated cone structures, and then uses the low melting point of paraffin to produce different geological structures for casting. Multiple layers of non-expanding rock blocks with different densities can not only simulate the heterogeneity of sedimentary rock geological bodies, but also effectively reduce casting costs by replacing or rotating the structures, thereby greatly reducing the time and cost of making verification samples.

Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

The present application is described with reference to the flowchart and/or block diagram of the method, device (system) and computer program product according to the embodiment of the present application. It should be understood that each process and/or box in the flowchart and/or block diagram, and the combination of the process and/or box in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for realizing the function specified in one process or multiple processes in the flowchart and/or one box or multiple boxes in the block diagram.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims (10)

1. A verification method based on an inversion algorithm of a geological structure dynamic adjustment model, characterized in that the method comprises: Making a truncated cone mold and a sedimentary rock mold; the interior of the truncated cone mold includes a truncated cone structure extending from the top of the truncated cone mold through the bottom; the sedimentary rock mold is used to obtain a simulated sedimentary rock; Making a prefabricated structural piece or a wax sculpture and placing it on the truncated table mold at a fixed angle; After pouring the non-expandable material in layers or as a whole into the truncated cone mold and heating it, the truncated cone structure is taken out from the truncated cone mold; Placing the truncated cone structure in the sedimentary rock mass mold and pouring the non-expanding material in layers; The sedimentary rock mass mold is heated and demoulded so as to separate the sedimentary rock mass and the sedimentary rock mass mold; transmitting active seismic sources at different positions on one side of the sedimentary rock mass and receiving waveform arrays on other sides to invert the sedimentary rock mass to obtain inversion results; The result deviation is calculated according to the inversion result to verify the inversion result. 2. According to the verification method based on the inversion algorithm of the geological structure dynamic adjustment model according to claim 1, it is characterized in that the upper surface area of the truncated cone structure is larger than the lower surface area, and the truncated cone structure is inclined to the truncated cone mold. 3. The verification method based on the geological structure dynamic adjustment model inversion algorithm according to claim 1 is characterized in that the method also includes: modulating a plurality of non-expandable materials, wherein the plurality of non-expandable materials have different densities and elastic moduli. 4. The verification method based on the geological structure dynamic adjustment model inversion algorithm according to claim 3 is characterized in that the method also includes: pouring the non-expanding material in layers into the sedimentary rock mass mold to form sedimentary rock masses of various densities. 5. The verification method based on the inversion algorithm of the geological structure dynamic adjustment model according to claim 1 is characterized in that making the prefabricated structural piece comprises: A prefabricated sheet of metal or plastic with known dimensions is coated with a thin layer of hot paraffin and allowed to dry to form an extremely thin isolation surface. 6. The verification method based on the inversion algorithm of the geological structure dynamic adjustment model according to claim 5 is characterized in that after the non-expanding material is poured in layers or as a whole in the truncated cone mold and heated, the method further comprises: When the heating temperature exceeds the melting point of the paraffin wax, the prefabricated structural piece is taken out or the truncated table is inverted to allow the paraffin wax sculpture to melt and flow out. 7. The verification method based on the inversion algorithm of the geological structure dynamic adjustment model according to claim 1 is characterized in that before placing the truncated cone structure in the sedimentary rock mass mold, the method further comprises: A layer of paraffin solution is hot-coated on the side surface of the truncated cone structure and the inner side of the sedimentary rock mass mold, and after the paraffin solution is cooled, the truncated cone structure is placed in the sedimentary rock mass mold. 8. The verification method based on the inversion algorithm of the geological structure dynamic adjustment model according to claim 1 is characterized in that calculating the result deviation degree according to the inversion result to verify the inversion result comprises: Preset spatial grids with different resolutions and set the original velocity field S _i,j,k for each grid, obtain the inverted velocity field v _i,j,k , and calculate the result deviation D. Where: S _i,j,k is the average wave velocity of the i-th grid in the x direction, the j-th grid in the y direction, and the k-th grid in the z direction when the original wave velocity field is divided into i*j*k grids in the x, y, and z coordinate axes respectively; v _i,j,k is the average wave velocity of the i-th grid in the x-direction, the j-th grid in the y-direction, and the k-th grid in the z-direction when the inverted wave velocity field is divided into i*j*k grids in the directions of the three coordinate axes x, y, and z respectively. 9. The verification method based on the geological structure dynamic adjustment model inversion algorithm according to claim 1, characterized in that the method further comprises: The frustum structure is rotated at a certain azimuth angle and inverted to obtain a plurality of inversion results and a plurality of result deviations. 10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps of any one of claims 1 to 9.