CN116577483A - Swelling soil three-dimensional fracture space-time evolution model test system - Google Patents
Swelling soil three-dimensional fracture space-time evolution model test system Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 154
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention discloses a test system for a three-dimensional crack space-time evolution model of expansive soil, which relates to the technical field of expansive soil slope engineering and comprises a model box, a crack evolution test device and a crack evolution software processing platform; the crack evolution test device is matched with the model box, the crack evolution test device is in signal connection with the crack evolution software processing platform, data are collected through the crack evolution test device, and the collected data are processed based on the crack evolution software processing platform so as to realize synchronous real-time test on internal crack evolution, spatial humidity change and soil expansion and contraction. According to the invention, by carrying the automatic acquisition device and the remote data management platform, the functions of automatic acquisition and cloud storage of a large amount of sensor data in the crack evolution test process are realized. The test system and the software platform are combined, so that the functions of moisture migration processes under different climatic conditions, dynamic development conditions of cracks under different depths, overall swelling and shrinking trend of soil bodies and the like can be recorded simultaneously.
Description
Technical Field
The invention relates to the technical field of expansive soil slope engineering, in particular to a model test system for the space-time evolution of three-dimensional fissures of expansive soil.
Background
The fissure property is one of important characteristics of the expansive soil, and the influence on the expansive soil slope engineering is not negligible. The crack expansion theory research is an important research foundation for revealing a crack expansion soil slope instability mechanism. The soil thickness is used as a key factor influencing the crack expansion degree, and deeper analytical research is needed. For thick soil, it is important to research the crack development rule and the local water content change process in the depth direction, and the method is closer to the actual engineering, and has more important significance for further revealing the crack expansion mechanism.
For crack study along the depth direction, a common technical means is CT scan test. CT scanning can realize three-dimensional reconstruction of the soil body by generally slicing the soil body in three dimensions and recording crack forms under different depths. However, this approach is more suitable for small-size sample research, and it is difficult to perform its function for large-scale experiments and practical engineering. Therefore, for this important study, there is currently a lack of more applicable test devices. The development of the crack observation equipment which can realize the real-time synchronous test function of the spatial humidity change and the internal crack evolution, is economical, applicable and convenient is particularly urgent.
Therefore, how to provide a model test system for the three-dimensional fracture space-time evolution of expansive soil to realize the real-time synchronous test of the spatial humidity change, the internal fracture evolution and the soil expansion and contraction is a problem which needs to be solved by the technicians in the field.
Disclosure of Invention
In view of the above, the invention provides an expansive soil three-dimensional fracture space-time evolution model test system which realizes the functions of automatic data acquisition and cloud storage in the fracture evolution test process through an automatic acquisition device and a remote data management platform. Based on high-density resistivity imaging characteristics, the method for realizing the reconstruction of the space fissure of the expansive soil further realizes the functions of real-time synchronous test of space humidity change, internal fissure evolution and soil expansion and contraction, provides a new platform for researching the moisture migration and fissure expansion mechanism of the expansive soil under complex hydraulic conditions, and adopts the following technical scheme in order to realize the purposes:
the expansive soil three-dimensional fracture space-time evolution model test system comprises a model box, a fracture evolution test device and a fracture evolution software processing platform;
the crack evolution test device is matched with the model box, the crack evolution test device is in signal connection with the crack evolution software processing platform, data are collected through the crack evolution test device, and the collected data are processed based on the crack evolution software processing platform so as to realize synchronous real-time test on internal crack evolution, spatial humidity change and soil expansion and contraction.
Optionally, the crack evolution test device comprises an apparent crack test module, a sensor test module and a resistivity test module, and the crack evolution software processing platform comprises a MATLAB image processing platform, a sensor remote equipment management platform and a spatial resistivity processing platform which are matched with the crack evolution test device.
Optionally, the apparent crack test module includes a forward high-resolution area array industrial camera, a lateral high-resolution area array industrial camera and an MVS client, where the forward high-resolution area array industrial camera and the lateral high-resolution area array industrial camera are both linked with the MVS client data, and the MVS client processes the data collected by the industrial camera.
Optionally, the apparent crack test module tests the crack evolution process and the plane expansion and contraction rule of the soil surface and the side along the depth direction, the indexes of direct test are images of the surface and the side containing cracks, and quantitative indexes of the surface and the side cracks and the plane expansion and contraction indexes are obtained through the indexes of direct test.
Optionally, the resistivity test module includes electrode, high density resistance survey system and resistivity test software platform, high density resistance survey system one end passes through the electrode and cooperates with the analog box, the other end with resistivity test software platform data link, high density resistance survey system passes through the electrode data collection, resistivity test software platform is with the data that high density resistance survey system gathered is handled.
Optionally, the sensor test module includes hygrothermograph, HBM high accuracy load sensor, EC-5 moisture sensor, TEROS-21 suction sensor, laser range finder, remote automatic collection box and remote automatic monitoring software system, remote automatic collection box one end with hygrothermograph, HBM high accuracy load sensor, EC-5 moisture sensor, TEROS-21 suction sensor and laser range finder data link, the other end with remote automatic monitoring software system signal connection, remote automatic monitoring software system transmission signal control remote automatic collection box gathers real-time data.
Optionally, the direct indexes tested by the sensor testing module include soil body load change, local water content, local suction force, temperature change in soil and vertical displacement, and the moisture change process and the vertical expansion and contraction indexes can be indirectly derived.
Optionally, the MATLAB image processing platform analyzes the data collected by the apparent fracture testing module to obtain a fracture skeleton, a fracture length, a fracture area and a fracture average width, and analyzes the data to generate a surface side fracture evolution process, a fracture quantitative description and a transverse expansion and contraction rule.
Optionally, the sensor remote equipment management platform obtains the spatial water content change, the overall water content change, the local suction force, the temperature and humidity change and the vertical expansion rule by analyzing the data acquired by the sensor test module.
Optionally, the spatial resistivity processing platform analyzes the data collected by the resistivity testing module based on a spatial fracture reconstruction technology of resistivity to obtain a spatial fracture evolution process and a spatial fracture quantitative description.
Compared with the prior art, the invention discloses and provides the expansive soil three-dimensional fracture space-time evolution model test system, which has the following beneficial effects:
the invention can simulate different rainfall intensity, dry and wet cycle times and other external complex conditions at the same time, and can record the temperature and humidity of the soil body and the change process of suction force in the soil body. The device has simple structure and easy operation, and can realize the functions of automatic data acquisition and cloud storage.
The invention adopts a high-resolution area array camera to dynamically record the expansion-closing process and the plane expansion-contraction process of the soil body surface and side cracks; the water content change, the temperature and humidity change, the vertical expansion and contraction and the suction change of the soil body are recorded by adopting a water sensor, a load sensor, a suction sensor and a laser range finder. And uniformly arranging flexible electrodes around the soil sample, recording the resistivity change process in the soil body by adopting a high-density resistance meter, and inverting the change process of the crack in space. In the test process, the automatic acquisition device and the remote data management platform are carried, so that the functions of automatic acquisition and cloud storage of a large amount of sensor data in the crack evolution test process are realized. The test system and the software platform are combined, so that the functions of simultaneously recording the moisture migration process under different climatic conditions, the dynamic development condition of cracks under different depths, the overall expansion and contraction trend of soil body and the like can be realized, and further the development and evolution process of cracks in a space under the moisture migration can be explored, so that the space evolution mechanism of the cracks of the expansive soil is revealed.
Compared with the traditional fracture test instrument, the swelling soil three-dimensional fracture space-time evolution model test system is characterized by being suitable for soil samples with larger sizes, and is closer to engineering practice, wherein the model box size can be adjusted according to actual requirements; the change rule of the spatial humidity field and the spatial fracture field can be monitored in real time; the data is automatically collected and the image is processed in batches, so that the test efficiency and the calculation speed are improved; meanwhile, a new idea is provided for revealing the moisture migration and deformation damage mechanism of the expansive soil under the complex hydraulic condition.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram provided by the present invention.
FIG. 2 is a schematic diagram of a crack evolution test device provided by the invention.
Fig. 3 is a schematic diagram of working condition calculation of an area array camera according to the present invention.
Wherein, 1-forward high-resolution area array industrial camera; 2-a bracket; 3-lateral high resolution area array industrial cameras; 4-a camera mount; a 5-MVS client; 6-camera connection lines; 7-a hygrothermograph; an 8-LED lighting system; 9-a model box; 10-testing soil mass; 11-vertical calipers; 12-HBM high-precision load sensor; 13-EC-5 moisture sensor; 14-TEROS-21 suction sensor; 15-a laser range finder; 16-an automated acquisition module; 17-220V power adapter; 18-an alarm control module; 19-a multi-channel data acquisition processor; a 20-GPRS wireless transmission module; 21-a remote automated monitoring software system; 22-a remote automated acquisition device; 23-data lines; 24-electrode; 25-conducting wires; 26-a high density resistance measurement system; 27-a resistivity test software platform; 28-load display; 29-a base; 30-rainfall device.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a swelling soil three-dimensional fracture space-time evolution model test system, which comprises a model box, a fracture evolution test device and a fracture evolution software processing platform;
the crack evolution test device comprises an apparent crack test module, a sensor test module and a resistivity test module, and the crack evolution software processing platform comprises an MATLAB image processing platform, a sensor remote equipment management platform and a spatial resistivity processing platform which are matched with the crack evolution test device;
the crack evolution test device is matched with the model box, the crack evolution test device is in signal connection with the crack evolution software processing platform, data are collected through the crack evolution test device, and the collected data are processed based on the crack evolution software processing platform so as to realize synchronous real-time test on internal crack evolution, spatial humidity change and soil expansion and contraction.
In the embodiment 1, the swelling soil three-dimensional fracture space-time evolution model test device comprises an apparent fracture test module, a moisture sensing test module and a resistivity test module. FIG. 2 is a schematic diagram of a crack evolution test apparatus:
i system: and an apparent fracture test module. Comprising the following steps: a forward high resolution area array industrial camera 1; a bracket 2; a lateral high resolution area array industrial camera 3; a camera mount 4; MVS client 5; a camera connection line 6;
II system: and a resistivity test module. Comprising the following steps: an electrode 24; a wire 25; a high density resistance measurement system 26; resistivity test software platform 27;
III system: and a sensor testing module. Comprising the following steps: a hygrothermograph 7; HBM high precision load sensor 12; an EC-5 moisture sensor 13; a TEROS-21 suction sensor 14; a laser range finder 15; an automated acquisition module 16;220V power adapter 17; an alarm control module 18; a multi-channel data acquisition processor 19; a GPRS wireless transmission module 20; a remote automated monitoring software system 21; a remote automated collection box 22; a data line 23;
the main body part of the system is a model box, and is made of organic glass material and is a carrier for the germination and development of expansive soil cracks. The appearance is cuboid, and the upside is open, and other each face is sealed and can dismantle. The test model box has excellent light transmittance on each side surface, and is more beneficial to observing the development rule of the crack. The standard size of the inner part of the model box is 540mm long, 360mm wide and 700mm high. And the model box size can be adjusted according to actual requirements to develop an expansive soil crack evolution model test. The test soil body 10 is filled in the model box, and the filling height of the test soil body 10 is 600mm and is 100mm away from the top surface of the model box. LED lighting systems are respectively arranged on four sides of the top end of the model box and used for providing sufficient light sources when observing crack expansion of a test soil body. A hygrothermograph 7 is arranged in one side surface of the top of the model box and used for grasping the temperature and the humidity of the system in real time in the test process;
HBM high-precision load sensors 12 are mounted on the four feet of the model box for real-time testing of the total mass of the model box and test soil during the test, thereby calculating the moisture infiltration and evaporation parameters. The HBM high-precision load sensor 12 is connected with the load display 28 through the data line 23, and the reading on the load display 28 is used for implementing visual monitoring of the system quality in the test process;
the model box is placed on a base 29, and a bracket 2 is installed on the upper part of the base for erecting test equipment. The forward high-resolution area array industrial camera 1 is arranged on the bracket and is positioned at a position 329mm above the center position of the top surface of the test soil body. A camera support 4 is arranged on one side of the model box, and a lateral high-resolution area array industrial camera 3 is arranged on the camera support 4 and positioned at a position 350mm away from the center of the side face of the test soil body. The forward high-resolution area array industrial camera 1 is used for identifying the surface crack development process of the test soil body, and the lateral high-resolution area array industrial camera 3 is used for identifying the crack development condition of the test soil body along the depth direction. The forward high-resolution area array industrial camera 1 and the lateral high-resolution area array industrial camera 3 are connected with the MVS client 5 through a camera connecting wire 6, and the MVS client 5 is used for realizing automatic acquisition of crack images;
the bracket 2 is also provided with a rainfall device which is positioned above the center position of the top surface of the model box and is used for simulating rainfall of a test system, so that moisture is provided for a test soil body and crack development of the test soil body is promoted;
the bracket 2 is also provided with a laser range finder 15 which is positioned above the center position of the top surface of the model box and is used for testing the distance between the reference surface and the surface of the test soil body so as to reflect the shrinkage and the volume change of the test soil body along the depth direction;
round holes are formed in the organic glass plates on the four sides of the model box, the electrodes 24 are used for being inserted into test soil through the round holes, 280 electrodes are arranged on the four sides of the model box, the electrodes 24 are arranged in 5 transverse rows on each side, the transverse distance between the electrodes 24 is 30mm, and the transverse distance between the electrodes 24 and the edge of the model box is 30mm; the longitudinal spacing of each row of electrodes is 100mm, and the distance between the uppermost row of electrodes 24 and the top surface of the test soil body is 100mm. Each electrode 24 is connected by a wire 25 to a high density resistance measurement system 26, the high density resistance measurement system 26 being connected to a resistivity test software platform 27;
5 EC-5 moisture sensors 13 and TEROS-21 suction sensors 14 are buried on the side surface of the short side of the test soil body 10 at equal intervals along the depth direction, wherein the EC-5 moisture sensors 13 are used for testing the moisture content in the test soil body, and the TEROS-21 suction sensors 14 are used for testing the suction in the test soil body 10;
the HBM high-precision load sensor 12, the EC-5 moisture sensor 13, the TEOS-21 suction sensor 14 and the laser range finder 15 are all connected with a multichannel data acquisition processor 19 in a remote automatic acquisition device 22 through a data line 23. After data and electronic signal conversion, automatic acquisition of different sensor data is realized. The remote automation acquisition device 22 carries a set of remote automation monitoring software system 21. The remote automatic monitoring software system 21 comprises a functional area, an item selection area and a data display area, integrates the data of different types of sensors, and can realize the functions of uploading and downloading the data in real time;
the remote automatic acquisition device 22 internally comprises an automatic acquisition module 16, a 220V power adapter 17, an alarm control module 18, a multichannel data acquisition processor 19 and a GPRS wireless transmission module 20. The remote automated acquisition device 22 needs to record a set of data every one hour to achieve automatic acquisition and cloud storage of various sensor data.
In the process of crack development, the apparent cracks of the expansive soil are obvious, and the digital image technology is a main observation means. In the system, the apparent crack test module is used for testing the crack evolution process and the plane expansion and contraction rule of the surface and the side surface of the soil body along the depth direction and automatically collecting images, wherein indexes of direct test are images with the surface and the side surface containing cracks, and quantitative indexes of the surface and the side surface cracks and the plane expansion and contraction indexes can be indirectly derived.
Further, in example 2, an apparent crack test module in which the accuracy of crack identification is related to the resolution of the area array industrial camera and directly related to the accuracy of the test results provides a method of selecting an appropriate industrial camera based on the required crack identification accuracy. Taking the model box as an example, the model selection steps of the forward high-resolution area array industrial camera are as follows:
(1) Determining the size of the field: the standard mold box internal dimensions were 540mm long and 360mm wide with an aspect ratio of 3:2, so the field of view dimensions were chosen to be a target width of 540mm and a target height of 360mm.
(2) Determining a resolution: resolution is the ratio of the field size to the industrial camera resolution. In a standard model box, the resolution of an industrial camera is 5472 multiplied by 3648, the size of a detected visual field is 540mm multiplied by 360mm, and the corresponding size of single pixels is 0.1mm, so that the identifiable crack precision is 0.1mm.
(3) Determining a focal length: the smaller the lens focal length f, the larger its imaging range. The focal lengths typically selected in the model test system are 8mm,12mm,16mm,25mm. The model box selects a focal length of 8 mm.
(4) Determining a working distance: the lens-to-test soil surface distance is L, and the focal length f is equal to the product of the working distance L and the ratio of the target surface size to the field of view size, namely:
wherein V, H is the field size; v and h are target surface sizes and are determined according to the model selected in the step (2). The working distance was calculated to be 328.9mm.
(5) Determining horizontal and vertical viewing angles:
wherein alpha is the horizontal view angle of the industrial camera, beta is the vertical view angle of the industrial camera, and f is the focal length of the lens.
In summary, the standard model box selects an industrial camera with resolution of 5472×3648, a lens with focal length of 8mm, a distance between the surface of the test soil body and the lens of 329mm, a horizontal viewing angle of 78.8 degrees and a vertical viewing angle of 57.4 degrees.
Taking a standard model box as an example, the working conditions of the area array camera are shown in fig. 3, and the technical parameters of the high-resolution area array industrial camera and the technical parameters of the lens are shown in table 2 and table 3 respectively.
TABLE 2
TABLE 3 Table 3
The time and precision of industrial camera measurement can be controlled by programming in the MVS client, and automatic acquisition of crack development and expansion and contraction performance indexes of the soil surface and the side surfaces is realized.
Further, in embodiment 3, a sensor testing module has the functions of testing the overall humidity and the local moisture content change, the local suction change, the temperature and humidity change and the vertical expansion and contraction rule of the soil body 10, and is provided with an automatic acquisition device and a remote data management platform, so that the functions of automatic acquisition and cloud storage of sensor data in the crack evolution test process are realized.
The direct indexes tested by the sensor testing module include soil body load change, local moisture content, local suction force, temperature change in soil and vertical displacement, and the moisture change process and the vertical expansion and contraction indexes can be indirectly derived. The main technical parameters of the EC-5 moisture sensor 13 are shown in Table 4.
TABLE 4 Table 4
The main technical parameters of the TEROS-21 suction sensor are shown in Table 5.
TABLE 5
The test system has high requirement on the weight, and therefore, a set of weighing system carrying the HBM high-precision weighing sensor 12 is designed for the test. The parameters are shown in Table 6.
TABLE 6
During the fracture expansion test, a large amount of data needs to be collected. In the sensor test module, the automatic acquisition module 16 and the remote automatic monitoring software system 21 can realize the functions of data automatic acquisition and cloud storage in the crack evolution test process.
The remote automation monitoring software system 21 comprises a functional area, an item selection area and a data display area, integrates data of different types of sensors, and can realize the functions of uploading and downloading data in real time.
Further, in embodiment 4, a resistivity test module may obtain a spatial resistivity distribution rule, and based on a soil mass high density resistivity imaging feature, may invert a spatial fracture morphology, thereby revealing a spatial fracture evolution rule.
The data directly measured by the resistivity test module are the resistivities between different electrodes in the soil body in the crack evolution process. The technical parameters of the high-density resistance measurement system are shown in Table 7.
TABLE 7
In the crack development process, the existing observation means hardly reflect the internal crack change rule because of the large size of the model test box. But the inside fissure of the soil body is used as a dominant seepage channel, so that the property of the soil body is directly influenced, and deeper research is needed. The high-density resistivity imaging measurement means is widely applied to the geotechnical industry. However, there have been few studies to introduce high density resistivity indicators into expansive soil fracture studies.
In the expansive soil three-dimensional fracture space-time evolution model test system, 5 layers of 280 electrodes are respectively arranged on the outer surfaces around the model test box and used for testing the resistivity. The test principle is as follows: when the water content in the soil body changes, the internal cracks of the soil body change, the resistance of the current passing between the two electrodes of the model box changes, and the distribution rule of the internal cracks can be represented through the change of the resistivity. By adopting the principle of slice scanning, the cloud image distribution on different planes can be obtained by respectively measuring the resistance values between different electrodes at different depths, and when the soil body cracks are changed, the corresponding cloud image is changed. And combining the resistivity data with different depths to obtain a resistivity distribution cloud image of the whole model box, so as to invert the crack distribution. The nondestructive detection of the crack change in the model box can be realized by the method, and a reference is provided for exploring the space crack development rule.
The adopted high-density resistance measuring system is a high-density resistivity imaging measuring system ERT21S, and the resistivity between any electrodes can be acquired at any time in the test process.
The resistivity test software platform adopts a Linux Fedora platform, can realize timing automatic data acquisition and records the resistivity in the crack development process.
The expansion soil body is contracted in the water evaporation, so that the electrode of the model box adopts a flexible electrode and can change along with the contraction of the expansion soil body.
The invention adopts a high-resolution area array camera to dynamically record the expansion-closing process and the plane expansion-contraction process of the soil body surface and side cracks; the water content change, the temperature and humidity change, the vertical expansion and contraction and the suction change of the soil body are recorded by adopting a water sensor, a load sensor, a suction sensor and a laser range finder. And uniformly arranging flexible electrodes around the soil sample, recording the resistivity change process in the soil body by adopting a high-density resistance meter, and inverting the change process of the crack in space. In the test process, the automatic acquisition device and the remote data management platform are carried, so that the functions of automatic acquisition and cloud storage of a large amount of sensor data in the crack evolution test process are realized. The test system and the software platform are combined, so that the functions of simultaneously recording the moisture migration process under different climatic conditions, the dynamic development condition of cracks under different depths, the overall expansion and contraction trend of soil body and the like can be realized, and further the development and evolution process of cracks in a space under the moisture migration can be explored, so that the space evolution mechanism of the expansion soil cracks is revealed.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The expansive soil three-dimensional fracture space-time evolution model test system is characterized by comprising a model box, a fracture evolution test device and a fracture evolution software processing platform;
the crack evolution test device is matched with the model box, the crack evolution test device is in signal connection with the crack evolution software processing platform, data are collected through the crack evolution test device, and the collected data are processed based on the crack evolution software processing platform so as to realize synchronous real-time test on internal crack evolution, spatial humidity change and soil expansion and contraction.
2. The expansive soil three-dimensional fracture space-time evolution model test system according to claim 1, wherein the fracture evolution test device comprises an apparent fracture test module, a sensor test module and a resistivity test module, and the fracture evolution software processing platform comprises an MATLAB image processing platform, a sensor remote equipment management platform and a spatial resistivity processing platform which are matched with the fracture evolution test device.
3. The expansive soil three-dimensional fracture space-time evolution model test system according to claim 2, wherein the apparent fracture test module comprises a forward high-resolution area array industrial camera (1), a lateral high-resolution area array industrial camera (3) and an MVS client (5), wherein the forward high-resolution area array industrial camera (1) and the lateral high-resolution area array industrial camera (3) are in data link with the MVS client (5), and data acquired by the industrial camera are processed through the MVS client (5).
4. The expansive soil three-dimensional fracture space-time evolution model test system according to claim 3, wherein the apparent fracture test module tests the fracture evolution process and the plane expansion and contraction rule of the soil surface and the side surface along the depth direction, the indexes directly tested are images with the surface and the side surface containing the fracture, and the quantitative indexes of the surface and the side surface fracture and the plane expansion and contraction indexes are obtained through the indexes directly tested.
5. The swelling soil three-dimensional fracture space-time evolution model test system according to claim 2, wherein the resistivity test module comprises an electrode (24), a high-density resistance measurement system (26) and a resistivity test software platform (27), one end of the high-density resistance measurement system (26) is matched with a simulation box through the electrode (24), the other end of the high-density resistance measurement system is in data link with the resistivity test software platform (27), the high-density resistance measurement system (26) collects data through the electrode (24), and the resistivity test software platform (27) processes the data collected by the high-density resistance measurement system (26).
6. The swelling soil three-dimensional fracture space-time evolution model test system according to claim 2, wherein the sensor test module comprises a hygrothermograph (7), an HBM high-precision load sensor (12), an EC-5 moisture sensor (13), a TEROS-21 suction sensor (14), a laser range finder (15), a remote automatic acquisition box (22) and a remote automatic monitoring software system (21), one end of the remote automatic acquisition box (22) is in data link with the hygrothermograph (7), the HBM high-precision load sensor (12), the EC-5 moisture sensor (13), the TEROS-21 suction sensor (14) and the laser range finder (15), the other end of the remote automatic acquisition box is in signal connection with the remote automatic monitoring software system (21), and the remote automatic monitoring software system (21) transmits signals to control the remote automatic acquisition box (22) to acquire real-time data.
7. The expansive soil three-dimensional fracture space-time evolution model test system according to claim 6 is characterized in that the direct indexes tested by the sensor test module are soil body load change, local moisture content, local suction force, temperature change in soil and vertical displacement, and in addition, the moisture change process and the vertical expansion and contraction indexes can be indirectly derived.
8. The expansive soil three-dimensional fracture space-time evolution model test system according to claim 2, wherein the MATLAB image processing platform analyzes data acquired by the apparent fracture test module to obtain a fracture skeleton, a fracture length, a fracture area and a fracture average width, and the MATLAB image processing platform analyzes and generates a surface side fracture evolution process, a fracture quantitative description and a transverse expansion and contraction rule.
9. The expansive soil three-dimensional fracture space-time evolution model test system according to claim 2 is characterized in that the sensor remote equipment management platform obtains spatial water content change, overall water content change, local suction force, temperature and humidity change and vertical expansion and contraction rule by analyzing data acquired by the sensor test module.
10. The expansive soil three-dimensional fracture space-time evolution model test system according to claim 2 is characterized in that the spatial resistivity processing platform analyzes data acquired by the resistivity test module based on a spatial fracture reconstruction technology of resistivity to obtain a spatial fracture evolution process and a spatial fracture quantitative description.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204832095U (en) * | 2015-08-05 | 2015-12-02 | 中国科学院武汉岩土力学研究所 | Alternation of wetting and drying crack measuring device of indoor soil property side slope model |
| CN105823716A (en) * | 2016-03-24 | 2016-08-03 | 华北水利水电大学 | Testing device for conducting real-time observation on rock and soil mass cracks under suction measurement condition |
| AU2020103936A4 (en) * | 2020-07-20 | 2021-02-11 | Central South University | Consolidation compression apparatus for testing wetting-drying cycle characteristics of expansive soil |
| CN112557436A (en) * | 2020-12-14 | 2021-03-26 | 中国科学院武汉岩土力学研究所 | Method and device for simulating expansion and shrinkage and water migration of soil body under complex environmental conditions |
| CN114019135A (en) * | 2021-09-23 | 2022-02-08 | 广西交科集团有限公司 | Test device for simulating expansive soil slope crack development process under dry-wet circulation effect |
| CN216051308U (en) * | 2021-10-20 | 2022-03-15 | 长安大学 | Multi-dimension-multi-physical-field fractured loess subsurface corrosion mechanism physical model experiment device |
-
2023
- 2023-05-12 CN CN202310546579.0A patent/CN116577483A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204832095U (en) * | 2015-08-05 | 2015-12-02 | 中国科学院武汉岩土力学研究所 | Alternation of wetting and drying crack measuring device of indoor soil property side slope model |
| CN105823716A (en) * | 2016-03-24 | 2016-08-03 | 华北水利水电大学 | Testing device for conducting real-time observation on rock and soil mass cracks under suction measurement condition |
| AU2020103936A4 (en) * | 2020-07-20 | 2021-02-11 | Central South University | Consolidation compression apparatus for testing wetting-drying cycle characteristics of expansive soil |
| CN112557436A (en) * | 2020-12-14 | 2021-03-26 | 中国科学院武汉岩土力学研究所 | Method and device for simulating expansion and shrinkage and water migration of soil body under complex environmental conditions |
| CN114019135A (en) * | 2021-09-23 | 2022-02-08 | 广西交科集团有限公司 | Test device for simulating expansive soil slope crack development process under dry-wet circulation effect |
| CN216051308U (en) * | 2021-10-20 | 2022-03-15 | 长安大学 | Multi-dimension-multi-physical-field fractured loess subsurface corrosion mechanism physical model experiment device |
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