CN114235519A - Method for researching mechanical behavior of soft-hard interbedded rock mass based on 3D printing technology - Google Patents
Method for researching mechanical behavior of soft-hard interbedded rock mass based on 3D printing technology Download PDFInfo
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- CN114235519A CN114235519A CN202111435998.4A CN202111435998A CN114235519A CN 114235519 A CN114235519 A CN 114235519A CN 202111435998 A CN202111435998 A CN 202111435998A CN 114235519 A CN114235519 A CN 114235519A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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Abstract
The invention discloses a method for researching mechanical behavior of a soft-hard interbedded rock mass based on a 3D printing technology, which comprises the following steps: 1. collecting samples of the rock and the structural surface; 2. three-dimensional laser scanning of a natural soft-hard interbedded rock mass layer; 3. 3D printing and physical model making of rock-like materials; 4. carrying out corresponding rock mechanical tests; compared with the prior sample preparation method, the method has the following advantages: the internal material of the 3D printing model is approximately homogeneous, so that the evolution rule of the damage is easier to observe when the test is carried out; in the 3D process, soft-hard interbedded rock mass models with different strengths are realized by controlling the glue concentration and the saturation of the glue; through the scanning and extraction of the natural rock structural surface, the natural structural surface is reconstructed by adopting 3D printing, and the interface condition of the soft-hard interbedded rock mass can be reflected more truly.
Description
Technical Field
The invention belongs to the field of rock mechanics, and particularly relates to a method for researching mechanical behavior of soft and hard interbedded rock based on a 3D printing technology.
Background
The soft and hard interbedded rock mass is commonly found in sedimentary strata and has extremely wide distribution in China. The soft and hard interbedded rock mass generally develops a large number of tensile structural surfaces due to the special geological environment and the mechanical property of the soft and hard interbedded rock mass, and the existence of the structural surfaces reduces the integrity of the rock mass and weakens the mechanical property of the rock mass. The joint has the characteristic of tensile property, so that the tight state of the rock mass structure is broken, and the problems of insufficient bearing capacity, stability loss, permeability enhancement and the like of the rock mass are caused. Therefore, researches on the mechanical properties and the damage forms of the soft and hard interbedded rock mass are carried out, a good foundation is laid for revealing the development mechanism of the internal structural plane of the soft and hard interbedded rock mass, and powerful support is provided for the disaster prevention and reduction researches of the vast rock engineering in soft and hard interbedded areas.
However, the integrity of the in-situ soft and hard interbedded rock mass is poor after long-time evolution, and the crack filling process of the sample cannot be observed; in addition, the sample preparation process and the test procedure are extremely inconvenient due to the limitation of size. Therefore, a physical model is urgently needed, which not only meets the shape state of the rock structural surface in a natural state, but also can visually observe the damage evolution process of the interbedded rock mass under the stress condition.
With the progress of 3D printing technology and the development of printing materials, some researchers have begun to explore the introduction of this technology into research work on rock mechanics. However, due to the limitations of 3D printing materials and processes, the simulation of the mechanical properties of the complex interbedded rock mass matrix is not complete. The main problems are as follows: (1) a preparation method of a stratified rock mass material based on 3D printing is lacked, and particularly the soft-hard interbedded rock mass aiming at the interface heterogeneous shear mechanical behavior. (2) The influence of the selected materials on the physical mechanical behavior of the finished product is not researched, and the response of the model mechanical evolution process to the 3D printing technology cannot be evaluated. (3) Less research relates to a whole set of flow method for 3D fine printing and mechanical behavior monitoring of soft and hard interbedded rock mass.
Disclosure of Invention
The invention aims to provide a method for researching mechanical behavior of soft and hard interbedded rock masses based on a 3D printing technology, so that the damage process of the soft and hard interbedded rock masses can be observed more conveniently and intuitively, and powerful support is provided for the disaster prevention and reduction research of vast rock engineering in soft and hard interbedded areas.
The invention aims to provide a method for researching mechanical behavior of a soft-hard interbedded rock mass based on a 3D printing technology, which mainly comprises the following steps: 1. collecting samples of the rock and the structural surface; 2. three-dimensional laser scanning of a natural soft-hard interbedded rock mass layer; 3. 3D printing and physical model making of rock-like materials; 4. four corresponding rock mechanics tests were carried out, as shown in fig. 1.
Wherein, the step 1 specifically comprises the following steps:
(1) and selecting a soft-hard interbedded rock mass area for carrying out extensive investigation, investigating geological factor information of the soft-hard interbedded rock mass, such as the thickness of a hard layer, the thickness of a field joint, the attitude and the like under a real condition, and using the investigated geological factor information as field data support of a rock mechanics test.
(2) Selecting a plurality of investigation points with obvious difference at the rock mass interface of the soft and hard interbedded layer, and collecting a layer sample containing the rock mass interface of the soft and hard interbedded layer.
Wherein, the step 2 specifically comprises the following steps:
as shown in fig. 2, a three-dimensional laser scanner (Handyscan 3D, precision 0.05mm) is used to scan the acquired soft-hard interbedded rock layer morphology to generate a three-dimensional digital grid, 2 strips with significant relief morphology difference are selected as representative layers, grid areas of 20cm × 20cm are respectively intercepted to generate an STL file as an instruction file input to a 3D printer.
Wherein, the step 3 is specifically as follows:
(1) selection of materials for physical models
As shown in fig. 3, a suitable printing substrate is required to be selected for carrying out the physical model test of the soft-hard interbedded rock mass, and two materials with different mechanical properties are selected to respectively simulate soft rock and hard rock according to literature reports and research:
firstly, selecting a VisiJet PXL gypsum powder material as a printing base material and a Saltwater cure as a penetrant aiming at the hard and brittle rock, and preparing a sample by adopting a three-dimensional printing (3DP) process, wherein the thickness precision of the printing layer is 0.1 mm.
Secondly, selecting a substrate material of Flexible resin for simulation aiming at the soft rock, and selecting a Stereo Lithography (SLA) process for sample preparation. Both samples were printed using an Objet 500connex3 multifunction 3D printer. According to previous researches, basic physical mechanical parameters of two rock physical models can reach the levels shown in the table 1, wherein, Flexible resin as a typical resin material has obvious rheological characteristics similar to other lipid materials, which creates rheological deformation conditions for the development of a later physical model constant pressure test.
The mechanical test is carried out on a standard test piece made of a simulation material through 3D printing, 3D printing software carried by a system can adjust the glue consumption in the test piece through changing the saturation parameter in the test piece, so that 4 different glue saturations are set, wherein the glue saturations are respectively 100%, 125%, 150% and 175%, and single-axis and three-axis compression tests and Brazilian splitting tests of the hard and brittle rock test piece are carried out under each condition to obtain parameters such as the compression strength, the tensile strength, the modulus, the Poisson ratio and the like of the hard and brittle rock under different saturations.
For flexible photosensitive resin printing materials, the addition amount of the diluent is found to influence the gel rate of the photosensitive resin, and further influence the mechanical property of the photosensitive resin. Therefore, a triaxial compression test of the mudstone printing test piece is carried out under the condition that the concentrations of the added diluents are 5%, 15%, 20% and 25%, and parameters such as compression strength, shearing strength parameters, modulus, Poisson ratio and the like of the mudstone under different saturation degrees are obtained.
(2) 3D printing production of physical model
As shown in tables 2 and 3, two representative samples are selected from the collected sandstone structural surface samples, the STL files of the structural surfaces and the three-dimensional geometric model are obtained through three-dimensional reconstruction according to the digital morphology information of the upper and lower structural surfaces of the sandstone sample, and the 3D printing technology is adopted to manufacture the physical model samples of the soft-hard interbedded rock mass. The soft-hard double-layer combined die can be used for a shear test, and the soft-hard-soft mutual layer combined die can be used for a compression test.
Wherein, the step 4 is specifically as follows:
(1) compression test:
when many factors need to be considered, orthogonal experimental design is adopted. The sample used in the experiment is a sandstone-like mudstone interbed model manufactured by 3D printing, and constant-pressure experiments under different pressures are carried out by utilizing a rock rigid press according to the combination of different layer thicknesses shown in Table 3.
Monitoring rock mechanics test process
As shown in fig. 4, deformation and fracture information of the test is acquired in real time during the loading of the physical model specimen. And monitoring damage and fracture in the rock mass by using an acoustic emission system, and carrying out three-dimensional positioning on the damage and fracture area to obtain the fracture evolution process of the joint. In order to accurately obtain the three-dimensional strain of the soft rock layer and the hard rock layer, the lateral expansion deformation of a sample is measured through optical fibers, and particularly the upper deformation and the lower deformation of a contact surface of the soft rock and the hard rock are measured; and meanwhile, observing the integral strain of the sample by adopting an MTI non-contact strain measurement system to obtain a strain field, and inverting the stress field by a self-contained program of the system.
And the fracture behavior characteristics of the vertical joint in the loading process, including fracture position, fracture direction and fracture sequence, are obtained through comprehensive monitoring.
(2) Shear test
As shown in fig. 5, the shearing behavior of the interface is two-dimensional center divergent anisotropic shearing, so that structural plane anisotropic shearing tests are performed on the same group of 3D-printed soft and hard combined samples according to 8 different directions under 1MPa, 2MPa, 3MPa, 5MPa and 10MPa of 5 normal stress conditions. In the contact shear test process of the soft and hard rocks, the strain of the upper rock body and the lower rock body of a shear surface is observed through an MTI non-contact strain measurement system, and the relation between micro-shear displacement and shear stress is obtained.
Compared with the prior sample preparation method, the method has the following advantages:
1.3D prints the material in the model and is similar to homogeneous, therefore it is easier to observe that it damages the evolution law when carrying on the experiment; and in the 3D process, the soft-hard interbedded rock mass models with different strengths are realized by controlling the glue concentration and the saturation of the glue.
2. Through the scanning and extraction of the natural rock structural surface, the natural structural surface is reconstructed by adopting 3D printing, and the interface condition of the soft-hard interbedded rock mass can be reflected more truly.
Drawings
FIG. 1 is a flow chart of a method for researching mechanical behavior of a soft-hard interbedded rock mass based on a 3D printing technology, which is provided by the invention;
FIG. 2 is a schematic diagram of acquisition of structural surface topography information;
FIG. 3 is a schematic diagram of a 3D printing process of hard brittle-like rock and soft rock-like rock;
FIG. 4 is a 3D printed physical model specimen loading and fracturing process;
FIG. 5 is a schematic view of the shear direction of a structural plane;
fig. 6 shows the physical and mechanical parameters that can be achieved by two 3D printed materials;
FIG. 7 is a 3D printing of a soft-hard double-layer combined shear test model;
FIG. 8 is a 3D print of a soft-hard-soft mutual layer combined constant pressure test model;
fig. 9 is a design factor for orthogonal experiments.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method for researching mechanical behavior of a soft-hard interbedded rock mass based on a 3D printing technology, which mainly comprises the following steps: 1. collecting samples of the rock and the structural surface; 2. three-dimensional laser scanning of a natural soft-hard interbedded rock mass layer; 3. 3D printing and physical model making of rock-like materials; 4. four corresponding rock mechanics tests were carried out, as shown in fig. 1.
Wherein, the step 1 specifically comprises the following steps:
(1) and selecting a soft-hard interbedded rock mass area for carrying out extensive investigation, investigating geological factor information of the soft-hard interbedded rock mass, such as the thickness of a hard layer, the thickness of a field joint, the attitude and the like under a real condition, and using the investigated geological factor information as field data support of a rock mechanics test.
(2) Selecting a plurality of investigation points with obvious difference at the rock mass interface of the soft and hard interbedded layer, and collecting a layer sample containing the rock mass interface of the soft and hard interbedded layer.
Wherein, the step 2 specifically comprises the following steps:
as shown in fig. 2, a three-dimensional laser scanner (Handyscan 3D, precision 0.05mm) is used to scan the acquired soft-hard interbedded rock layer morphology to generate a three-dimensional digital grid, 2 strips with significant relief morphology difference are selected as representative layers, grid areas of 20cm × 20cm are respectively intercepted to generate an STL file as an instruction file input to a 3D printer.
Wherein, the step 3 is specifically as follows:
(1) selection of materials for physical models
As shown in fig. 3, a suitable printing substrate is required to be selected for carrying out the physical model test of the soft-hard interbedded rock mass, and two materials with different mechanical properties are selected to respectively simulate soft rock and hard rock according to literature reports and research:
firstly, selecting a VisiJet PXL gypsum powder material as a printing base material and a Saltwater cure as a penetrant aiming at the hard and brittle rock, and preparing a sample by adopting a three-dimensional printing (3DP) process, wherein the thickness precision of the printing layer is 0.1 mm.
Secondly, selecting a substrate material of Flexible resin for simulation aiming at the soft rock, and selecting a Stereo Lithography (SLA) process for sample preparation. Both samples were printed using an Objet 500connex3 multifunction 3D printer. According to previous researches, basic physical mechanical parameters of two rock physical models can reach the levels shown in the table 1, wherein, Flexible resin as a typical resin material has obvious rheological characteristics similar to other lipid materials, which creates rheological deformation conditions for the development of a later physical model constant pressure test.
The mechanical test is carried out on a standard test piece made of a simulation material through 3D printing, 3D printing software carried by a system can adjust the glue consumption in the test piece through changing the saturation parameter in the test piece, so that 4 different glue saturations are set, wherein the glue saturations are respectively 100%, 125%, 150% and 175%, and single-axis and three-axis compression tests and Brazilian splitting tests of the hard and brittle rock test piece are carried out under each condition to obtain parameters such as the compression strength, the tensile strength, the modulus, the Poisson ratio and the like of the hard and brittle rock under different saturations.
For flexible photosensitive resin printing materials, the addition amount of the diluent is found to influence the gel rate of the photosensitive resin, and further influence the mechanical property of the photosensitive resin. Therefore, a triaxial compression test of the mudstone printing test piece is carried out under the condition that the concentrations of the added diluents are 5%, 15%, 20% and 25%, and parameters such as compression strength, shearing strength parameters, modulus, Poisson ratio and the like of the mudstone under different saturation degrees are obtained.
(2) 3D printing production of physical model
As shown in tables 2 and 3, two representative samples are selected from the collected sandstone structural surface samples, the STL files of the structural surfaces and the three-dimensional geometric model are obtained through three-dimensional reconstruction according to the digital morphology information of the upper and lower structural surfaces of the sandstone sample, and the 3D printing technology is adopted to manufacture the physical model samples of the soft-hard interbedded rock mass. The soft-hard double-layer combined die can be used for a shear test, and the soft-hard-soft mutual layer combined die can be used for a compression test.
Wherein, the step 4 is specifically as follows:
(1) compression test:
when many factors need to be considered, orthogonal experimental design is adopted. The sample used in the experiment is a sandstone-like mudstone interbed model manufactured by 3D printing, and constant-pressure experiments under different pressures are carried out by utilizing a rock rigid press according to the combination of different layer thicknesses shown in Table 4.
Monitoring rock mechanics test process
As shown in fig. 4, deformation and fracture information of the test is acquired in real time during the loading of the physical model specimen. And monitoring damage and fracture in the rock mass by using an acoustic emission system, and carrying out three-dimensional positioning on the damage and fracture area to obtain the fracture evolution process of the joint. In order to accurately obtain the three-dimensional strain of the soft rock layer and the hard rock layer, the lateral expansion deformation of a sample is measured through optical fibers, and particularly the upper deformation and the lower deformation of a contact surface of the soft rock and the hard rock are measured; and meanwhile, observing the integral strain of the sample by adopting an MTI non-contact strain measurement system to obtain a strain field, and inverting the stress field by a self-contained program of the system.
And the fracture behavior characteristics of the vertical joint in the loading process, including fracture position, fracture direction and fracture sequence, are obtained through comprehensive monitoring.
(2) Shear test
As shown in fig. 5, the shearing behavior of the interface is two-dimensional center divergent anisotropic shearing, so that structural plane anisotropic shearing tests are performed on the same group of 3D-printed soft and hard combined samples according to 8 different directions under 1MPa, 2MPa, 3MPa, 5MPa and 10MPa of 5 normal stress conditions. In the contact shear test process of the soft and hard rocks, the strain of the upper rock body and the lower rock body of a shear surface is observed through an MTI non-contact strain measurement system, and the relation between micro-shear displacement and shear stress is obtained.
Claims (5)
1. A method for researching mechanical behavior of soft and hard interbedded rock mass based on 3D printing technology is characterized in that: the method comprises the following steps: the method comprises the following steps of firstly, collecting samples of rocks and structural planes, secondly, three-dimensional laser scanning of a natural soft-hard interbedded rock mass layer, thirdly, 3D printing of rock-like materials and manufacturing of physical models, and fourthly, developing corresponding rock mechanical tests.
2. The method for researching mechanical behavior of soft and hard interbedded rock mass based on 3D printing technology according to claim 1, wherein the first step is specifically as follows:
(1) and selecting a soft and hard interbedded rock mass area for carrying out extensive investigation, investigating geological factor information of soft layer thickness, hard layer thickness, on-site joint occurrence and the like of the soft and hard interbedded rock mass under a real condition, and using the investigated geological factor information as on-site data support of a rock mass mechanics test.
(2) Selecting a plurality of investigation points with obvious difference at the rock mass interface of the soft and hard interbedded layer, and collecting a layer sample containing the rock mass interface of the soft and hard interbedded layer.
3. The method for researching mechanical behavior of soft and hard interbedded rock mass based on 3D printing technology according to claim 1, wherein the second step is specifically as follows:
the method comprises the steps of scanning and collecting the morphology of soft-hard interbedded rock mass layers by using a three-dimensional laser scanner (Handyscan 3D, the precision is 0.05mm), generating three-dimensional digital grids, selecting 2 strips with remarkable fluctuation morphology difference as representative layers, respectively intercepting the area of the grids of 20cm multiplied by 20cm, generating STL files, and using the STL files as instruction files input into a 3D printer.
4. The method for researching mechanical behavior of soft and hard interbedded rock mass based on 3D printing technology according to claim 1, wherein the third step is specifically as follows:
(1) selection of materials for physical models
Proper printing base materials are required to be selected for developing the physical model test of the soft-hard interbedded rock mass, and two materials with different mechanical properties are selected to respectively simulate soft rock and hard rock according to literature reports and research: firstly, selecting a VisiJet PXL gypsum powder material as a printing base material and a Saltwater cure as a penetrant aiming at the hard and brittle rock, and preparing a sample by adopting a three-dimensional printing (3DP) process, wherein the thickness precision of the printing layer is 0.1 mm. Secondly, selecting a substrate material of Flexible resin for simulation aiming at the soft rock, and selecting a Stereo Lithography (SLA) process for sample preparation. Both samples were printed using an Objet 500connex3 multifunction 3D printer. According to previous researches, basic physical mechanical parameters of two rock physical models can reach the levels shown in the table 1, wherein, Flexible resin as a typical resin material has obvious rheological characteristics similar to other lipid materials, which creates rheological deformation conditions for the development of a later physical model constant pressure test.
The mechanical test is carried out on a standard test piece made of a simulation material through 3D printing, 3D printing software carried by a system can adjust the glue consumption in the test piece through changing the saturation parameter in the test piece, so that 4 different glue saturations are set, wherein the glue saturations are respectively 100%, 125%, 150% and 175%, and single-axis and three-axis compression tests and Brazilian splitting tests of the hard and brittle rock test piece are carried out under each condition to obtain parameters such as the compression strength, the tensile strength, the modulus, the Poisson ratio and the like of the hard and brittle rock under different saturations.
For flexible photosensitive resin printing materials, the gel rate of the photosensitive resin is influenced by the addition amount of the diluent, and the mechanical property of the photosensitive resin is further influenced. Therefore, a triaxial compression test of the mudstone printing test piece is carried out under the condition that the concentrations of the added diluents are 5%, 15%, 20% and 25%, and parameters such as compression strength, shearing strength parameters, modulus, Poisson ratio and the like of the mudstone under different saturation degrees are obtained.
(2) 3D printing production of physical model
Selecting two representative samples from the collected sandstone structural surface samples, obtaining STL files of the structural surfaces and the three-dimensional geometric model through three-dimensional reconstruction according to the shape digital information of the upper structural surface and the lower structural surface of the sandstone sample, and manufacturing the soft-hard interbedded rock physical model sample by adopting a 3D printing technology. The soft-hard double-layer combined die can be used for a shear test, and the soft-hard-soft mutual layer combined die can be used for a compression test. The dimensions of the 3D-printed soft-hard interbedded rock model samples are as follows (tables 2& 3).
5. The method for researching mechanical behavior of soft and hard interbedded rock mass based on 3D printing technology according to claim 1, wherein the fourth step is specifically as follows:
(1) compression test:
when many factors need to be considered, orthogonal experimental design is adopted. The sample used in the experiment is a sandstone-like mudstone interbed model manufactured by 3D printing, and constant-pressure experiments under different pressures are carried out by utilizing a rock rigid press according to the combination of different layer thicknesses shown in Table 3.
Monitoring rock mechanics test process
And acquiring deformation and rupture information of the test in real time in the process of loading the physical model sample. And monitoring damage and fracture in the rock mass by using an acoustic emission system, and carrying out three-dimensional positioning on the damage and fracture area to obtain the fracture evolution process of the joint. In order to accurately obtain the three-dimensional strain of the soft rock layer and the hard rock layer, the lateral expansion deformation of a sample is measured through optical fibers, and particularly the upper deformation and the lower deformation of a contact surface of the soft rock and the hard rock are measured; and meanwhile, observing the integral strain of the sample by adopting an MTI non-contact strain measurement system to obtain a strain field, and inverting the stress field by a self-contained program of the system.
And the fracture behavior characteristics of the vertical joint in the loading process, including fracture position, fracture direction and fracture sequence, are obtained through comprehensive monitoring.
(2) Shear test
The shearing behavior of the interface is two-dimensional center divergent anisotropic shearing, so that structural plane anisotropic shearing tests are developed in 8 different directions under 5 normal stress conditions of 1MPa, 2MPa, 3MPa, 5MPa and 10MPa respectively for the same group of 3D printed soft and hard combined samples. In the contact shear test process of the soft and hard rocks, the strain of the upper rock body and the lower rock body of a shear surface is observed through an MTI non-contact strain measurement system, and the relation between micro-shear displacement and shear stress is obtained.
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| CN115372099A (en) * | 2022-08-23 | 2022-11-22 | 东北大学 | Rock-soil thermal insulation material preparation and 3D printing method for physical model test |
| CN115464744A (en) * | 2022-09-05 | 2022-12-13 | 东北石油大学 | 3D printing-based rock micro-fault similar model manufacturing method |
| CN117848921A (en) * | 2023-11-30 | 2024-04-09 | 中国人民解放军陆军工程大学 | Rock-soil medium gas content, saturation measurement and disaster pregnancy and disaster reduction evaluation method based on mesoscopic model construction |
| CN117848921B (en) * | 2023-11-30 | 2024-08-30 | 中国人民解放军陆军工程大学 | Rock-soil medium gas content, saturation measurement and disaster pregnancy and disaster reduction evaluation method based on mesoscopic model construction |
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