Deep-ground complex perturbation seepage shear test device and test method

Abstract

The invention discloses a deep-ground complex disturbance seepage shear test device and a test method.The shear test device comprises a sample assembly, a shear box assembly and a pressure cabin, the sample assembly comprises a sample and is used for monitoring the influence of the sample subjected to multi-direction disturbance in a deep-ground environment; the shear box assembly is used for loading the sample assembly and transmitting pressure and shear force; the pressure chamber is used for providing pressure and shear force and simulating the high pressure condition in the deep ground environment. The water inlet channel and the water outlet channel are formed in the upper sample and the lower sample, so that external high-pressure water can enter the samples to simulate the high osmotic pressure condition in a deep ground scene, and meanwhile, each pressure head in the pressure cabin can apply pressure and shear force to the samples; and further simulating the stress condition of the rock-soil body after being coupled by various factors in a deep ground situation. The invention relates to the technical field of underground engineering.

Description

Technical Field

[0001] The present application relates to the field of underground engineering technology, and in particular to a deep underground complex disturbance seepage shear test device and test method. Background Art

[0002] The environment faced by deep underground projects is extremely complex and is often affected by extreme conditions such as high ground stress, high osmotic pressure, high temperature and dynamic disturbance, which not only threatens the stability of the rock mass, but also poses a severe challenge to engineering safety. At present, it is difficult for traditional triaxial test equipment to truly reproduce the stress, seepage and temperature changes of the rock mass under these extreme conditions, resulting in obvious limitations in existing experimental methods and equipment when simulating the actual stress state of deep rock formations. Therefore, studying how to accurately simulate the mechanical behavior of deep rock mass, especially the shear seepage process, under the "three highs and one disturbance" environment has become one of the key scientific issues in the current field of deep underground engineering. In this regard, the development of new test equipment and research methods can not only provide an important theoretical basis for the evaluation of deep rock mass stability, but also have important practical significance for the safe and efficient exploitation of deep resources. Summary of the invention

[0003] The purpose of the present application is to solve at least one of the technical problems existing in the prior art, and to provide a deep underground complex disturbance seepage shear test device and test method, which can simultaneously apply force to rock and soil samples and create a high-pressure seepage environment, so as to better simulate the stress conditions of rock and soil deep underground.

[0004] According to the first aspect of the present application, a deep earth complex disturbance seepage shear test device is provided, comprising:

[0005] A sample assembly, the sample assembly comprising an upper sample, a lower sample and a polyurethane layer, the bottom surface of the upper sample being a first joint surface, the upper sample being provided with a water inlet channel extending to the first joint surface; the top surface of the lower sample being a second joint surface, the lower sample being provided with a water outlet channel extending to the second joint surface; the top surface of the polyurethane layer being bonded to the first joint surface, and the bottom surface of the polyurethane layer being bonded to the second joint surface;

[0006] A shear box assembly, the shear box assembly comprising an upper shear box and a lower shear box, the upper shear box and the lower shear box are both L-shaped structures, the upper shear box and the lower shear box are mutually buckled to form an extrusion space therebetween, the sample assembly is placed in the extrusion space;

[0007] A pressure chamber, wherein a first pressure head, a second pressure head, a third pressure head and a chamber pressure are arranged in the pressure chamber, wherein the first pressure head abuts against the side surface of the upper shear box, the second pressure head abuts against the side surface of the lower shear box, the third pressure head abuts against the top surface of the upper shear box, and the chamber pressure surrounds the shear box assembly; the pressure chamber is also provided with a seepage inlet and a seepage outlet, wherein the seepage inlet is connected to the water inlet channel via a pipe, and the seepage outlet is connected to the water outlet channel via a pipe;

[0008] Among them, the first pressure head and the second pressure head apply pressure to the shear box assembly to generate shear force on the sample assembly, the third pressure head applies pressure to the upper shear box to generate normal pressure on the sample assembly, the cabin pressure provides annular pressure to the shear box assembly, and the seepage inlet can allow high-pressure water to pass through to increase the pressure on the sample assembly.

[0009] According to the first aspect embodiment of the present application, further, the shear box assembly also includes a rubber ring, which connects the upper shear box and the lower shear box together, and drives the upper shear box and the lower shear box to approach each other through elastic force.

[0010] According to the first aspect embodiment of the present application, further, an upper roller is installed on the top of the upper shear box, and the upper roller is in rolling contact with the third pressure head, and the upper roller is used to reduce the friction between the upper roller and the third pressure head.

[0011] According to the first aspect embodiment of the present application, further, the upper roller is connected to the upper shear box through a return spring.

[0012] According to the first aspect embodiment of the present application, further, a lower roller is installed at the bottom of the lower shear box, and the lower roller is in rolling contact with the inner wall of the pressure chamber, and the lower roller is used to reduce the friction between the lower roller and the inner wall of the pressure chamber.

[0013] According to the first aspect embodiment of the present application, further, the lower roller is connected to the lower shear box through a return spring.

[0014] According to the first aspect of the present application, the shear box assembly further includes a connecting rod, and both ends of the connecting rod are respectively connected to the upper roller and the lower roller.

[0015] According to the first aspect embodiment of the present application, further, the deep underground complex disturbance seepage shear test device also includes a water pump, a water reservoir, a flow meter and a wastewater tank, the water pump fills the water in the water reservoir into the seepage inlet, the seepage outlet is connected to the wastewater tank through the flow meter, and the flow meter is used to detect the seepage amount.

[0016] According to the first aspect embodiment of the present application, further, the deep underground complex disturbance seepage shear test device also includes a control system and a servo system electrically connected to each other, the first pressure head, the second pressure head, the third pressure head and the cabin pressure are all electrically connected to the servo system, and the servo system is used to control the pressure of each pressure head.

[0017] According to a second aspect of the present application, a test method is provided, which is based on the above-mentioned deep complex disturbance seepage shear test device and includes the following steps:

[0018] Drilling holes in the upper sample using an electric drill to obtain a water inlet channel, drilling holes in the lower sample using an electric drill to obtain a water outlet channel, and installing joints in the water inlet channel and the water outlet channel;

[0019] Spraying polyurethane material on the side of the rock mass between the first joint surface of the upper sample and the second joint surface of the lower sample, so that the polyurethane layer completely seals the first joint surface and the second joint surface;

[0020] Placing the processed sample assembly between the upper shear box and the lower shear box;

[0021] placing the shear box assembly together with the sample assembly in the pressure chamber;

[0022] Connecting the pipe extending from the seepage inlet to the joint of the water inlet channel, and connecting the pipe extending from the seepage outlet to the joint of the water outlet channel;

[0023] The pressure chamber is sealed, and oil is injected into the pressure chamber to seal the sample;

[0024] Starting the first pressing head, the second pressing head and the third pressing head to apply pressure to the shear box assembly;

[0025] Starting an external water supply device to increase the water pressure in the sample assembly;

[0026] Start the experiment and record the data;

[0027] Export the data and analyze the results, and the experiment is completed.

[0028] The beneficial effects of the embodiments of the present application include at least: the present application opens a water inlet channel and a water outlet channel in the upper sample and the lower sample, so that external high-pressure water can enter the interior of the sample to simulate the high osmotic pressure conditions in the deep earth scenario. At the same time, the various pressure heads in the pressure chamber can apply pressure and shear force to the sample, thereby simulating the stress conditions of the rock and soil body after being coupled by various factors in the deep earth scenario. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief description of the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present application, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0030] Figure 1 It is a three-dimensional diagram of the upper sample 110 and the lower sample 120 in the deep underground complex disturbance seepage shear test device of the first aspect of the embodiment of the present application;

[0031] Figure 2 It is a three-dimensional diagram of the sample assembly 100 in the deep complex disturbance seepage shear test device of the first aspect of the embodiment of the present application;

[0032] Figure 3 It is a cross-sectional view of a shear box assembly 200 and a pressure chamber 300 in a deep-earth complex disturbance seepage shear test device according to an embodiment of the first aspect of the present application;

[0033] Figure 4 It is a connection diagram of a deep underground complex disturbance seepage shear test device according to an embodiment of the first aspect of the present application.

[0034] Figure markings: 100-sample assembly, 110-upper sample, 111-water inlet channel, 120-lower sample, 121-water outlet channel, 130-polyurethane layer, 200-shear box assembly, 210-upper shear box, 220-lower shear box, 230-rubber ring, 240-upper roller, 250-lower roller, 260-return spring, 270-connecting rod, 300-pressure chamber, 310-first pressure head, 320-second pressure head, 330-third pressure head, 340-seepage inlet, 350-seepage outlet. DETAILED DESCRIPTION

[0035] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0036] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0038] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0039] At present, it is difficult for traditional triaxial test equipment to truly reproduce the stress, seepage and temperature changes of rock masses under these extreme conditions, resulting in obvious limitations of existing experimental methods and equipment in simulating the actual stress state of deep rock formations. Therefore, studying how to accurately simulate the mechanical behavior of deep rock masses, especially the shear seepage process, under the "three highs and one disturbance" environment has become one of the key scientific issues in the current field of deep underground engineering.

[0040] In this regard, the present application proposes a deep-earth complex disturbance seepage shear test device and test method, by opening a water inlet channel 111 and a water outlet channel 121 in the upper sample 110 and the lower sample 120, so that external high-pressure water can enter the interior of the sample to simulate the high osmotic pressure situation in the deep-earth scenario. At the same time, each pressure head in the pressure chamber 300 can apply pressure and shear force to the sample, thereby simulating the stress condition of the rock and soil body after being coupled by various factors in the deep-earth scenario.

[0041] The deep-earth complex disturbance seepage shear test device in the first embodiment of the present application includes a sample assembly 100, a shear box assembly 200 and a pressure chamber 300, wherein the sample assembly 100 contains a sample for detecting the influence of multiple disturbances on the sample in a deep-earth environment; the shear box assembly 200 is used to load the sample assembly 100 and transmit pressure and shear force; the pressure chamber 300 is used to provide pressure and shear force and simulate the high-pressure conditions in a deep-earth environment.

[0042] Specifically, refer to Figure 1 and Figure 2The sample assembly 100 includes an upper sample 110, a lower sample 120 and a polyurethane layer 130. The bottom surface of the upper sample 110 is a first joint surface, and the upper sample 110 is provided with a water inlet channel 111 extending to the first joint surface. The top surface of the lower sample 120 is a second joint surface, and the lower sample 120 is provided with a water outlet channel 121 extending to the second joint surface. The top surface of the polyurethane layer 130 is bonded to the first joint surface, and the bottom surface of the polyurethane layer 130 is bonded to the second joint surface, so that the upper sample 110, the lower sample 120 and the polyurethane layer 130 are bonded together.

[0043] Reference Figure 3 The shear box assembly 200 includes an upper shear box 210 and a lower shear box 220. The upper shear box 210 and the lower shear box 220 are both L-shaped structures. The upper shear box 210 and the lower shear box 220 are interlocked and form an extrusion space between them. The sample assembly 100 is placed in the extrusion space. Therefore, when pressure is applied to the upper shear box 210 and the lower shear box 220 respectively, both pressure and shear force can be applied to the sample assembly 100, thereby simulating the complex mechanical environment in the deep earth environment.

[0044] The pressure chamber 300 is provided with a first pressure head 310, a second pressure head 320, a third pressure head 330 and a chamber pressure. The first pressure head 310 abuts against the side of the upper shear box 210, the second pressure head 320 abuts against the side of the lower shear box 220, the third pressure head 330 abuts against the top surface of the upper shear box 210, and the chamber pressure surrounds the shear box assembly 200. Each pressure head can apply pressure to different sides of the sample assembly 100, and the chamber pressure can provide annular pressure to the shear box assembly. The pressure chamber 300 is also provided with a seepage inlet 340 and a seepage outlet 350, the seepage inlet 340 is connected to the water inlet channel 111 through a pipe, and the seepage outlet 350 is connected to the water outlet channel 121 through a pipe.

[0045] Among them, the first pressure head 310 and the second pressure head 320 apply pressure to the shear box assembly 200 to generate shear force on the sample assembly 100, the third pressure head 330 applies pressure to the upper shear box 210 to generate normal pressure on the sample assembly 100, and the seepage inlet 340 can pass high-pressure water to increase the pressure on the sample assembly 100, thereby simulating the coupling scenarios of various conditions of pressure, shear force and high osmotic pressure, and improving the simulation of the deep earth environment.

[0046] Furthermore, the shear box assembly 200 also includes a rubber ring 230, which connects the upper shear box 210 and the lower shear box 220 together, and drives the upper shear box 210 and the lower shear box 220 to approach each other through elastic force, thereby preventing the upper shear box 210 and the lower shear box 220 from separating from each other and loosening, and the sample assembly 100 can be placed more stably between the upper shear box 210 and the lower shear box 220.

[0047] Furthermore, an upper roller 240 is installed on the top of the upper shear box 210, and the upper roller 240 is in rolling contact with the third pressure head 330. The upper roller 240 is used to reduce the friction between the third pressure head 330, thereby reducing the scratches between the third pressure head 330 and the upper shear box 210 when the shear box assembly 200 is driven by the first pressure head 310 or the second pressure head 320 to undergo lateral displacement.

[0048] Furthermore, the upper roller 240 is connected to the upper shear box 210 via a return spring 260 to prevent the upper roller 240 and the upper shear box 210 from being separated from each other.

[0049] Furthermore, a lower roller 250 is installed at the bottom of the lower shear box 220, and the lower roller 250 is in rolling contact with the inner wall of the pressure chamber 300. The lower roller 250 is used to reduce the friction between the inner wall of the pressure chamber 300, thereby reducing the scratches between the lower shear box 220 and the inner wall of the pressure chamber 300 when the shear box assembly 200 is driven by the first pressure head 310 or the second pressure head 320 to undergo lateral displacement.

[0050] Furthermore, the lower roller 250 is connected to the lower shear box 220 via a return spring 260 to prevent the lower roller 250 and the lower shear box 220 from being separated from each other.

[0051] Furthermore, the shear box assembly 200 also includes a connecting rod 270, the two ends of which are respectively connected to the upper roller 240 and the lower roller 250 to maintain the relative position of the upper roller 240 and the lower roller 250, thereby preventing the direction of the force from being offset due to the misalignment of the upper roller 240 and the lower roller 250 when the third pressure head 330 applies pressure.

[0052] Reference Figure 4 The deep ground complex disturbance seepage shear test device also includes a water pump, a water reservoir, a flow meter and a wastewater pool. The water pump fills the water in the water reservoir into the seepage inlet 340, and the seepage outlet 350 is connected to the wastewater pool through a flow meter, and the flow meter is used to detect the seepage amount.

[0053] Furthermore, the deep underground complex disturbance seepage shear test device also includes a control system and a servo system that are electrically connected to each other. The first pressure head 310, the second pressure head 320, the third pressure head 330 and the cabin pressure are all electrically connected to the servo system, and the servo system is used to control the pressure of each pressure head.

[0054] A test method in an embodiment of the second aspect of the present application is carried out based on the above-mentioned deep complex disturbance seepage shear test device, comprising the following steps:

[0055] S100. Use an electric drill to drill holes on the upper sample 110 to obtain a water inlet channel 111, use an electric drill to drill holes on the lower sample 120 to obtain a water outlet channel 121, and install joints in the water inlet channel 111 and the water outlet channel 121;

[0056] S200. Spraying polyurethane material on the side of the rock mass between the first joint surface of the upper sample 110 and the second joint surface of the lower sample 120, so as to obtain a polyurethane layer 130 that completely seals the first joint surface and the second joint surface;

[0057] S300. The processed sample assembly 100 is placed between the upper shear box 210 and the lower shear box 220;

[0058] S400. The shear box assembly 200 and the sample assembly 100 are placed in the pressure chamber 300;

[0059] S500. The pipe extending from the seepage inlet 340 is connected to the joint of the water inlet channel 111, and the pipe extending from the seepage outlet 350 is connected to the joint of the water outlet channel 121;

[0060] S600. The pressure chamber 300 is closed, and the oil is filled into the pressure chamber 300 to seal the sample;

[0061] S700. Start the first pressure head 310, the second pressure head 320 and the third pressure head 330 to apply pressure to the shear box assembly 200;

[0062] S800. Start the external water supply device to increase the water pressure within the sample assembly 100;

[0063] S900. Start the test and record the data;

[0064] S1000. Export data and analyze results, and the experiment ends.

[0065] The above is a specific description of the preferred implementation methods of the present application, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present application, and these equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A deep-earth complex disturbance seepage shear test device, characterized in that: include: A sample assembly, the sample assembly comprising an upper sample, a lower sample and a polyurethane layer, the bottom surface of the upper sample being a first joint surface, the upper sample being provided with a water inlet channel extending to the first joint surface; the top surface of the lower sample being a second joint surface, the lower sample being provided with a water outlet channel extending to the second joint surface; the top surface of the polyurethane layer being bonded to the first joint surface, and the bottom surface of the polyurethane layer being bonded to the second joint surface; A shear box assembly, the shear box assembly comprising an upper shear box and a lower shear box, the upper shear box and the lower shear box are both L-shaped structures, the upper shear box and the lower shear box are mutually buckled to form an extrusion space therebetween, the sample assembly is placed in the extrusion space; A pressure chamber, wherein a first pressure head, a second pressure head, a third pressure head and a chamber pressure are arranged in the pressure chamber, wherein the first pressure head abuts against the side surface of the upper shear box, the second pressure head abuts against the side surface of the lower shear box, the third pressure head abuts against the top surface of the upper shear box, and the chamber pressure surrounds the shear box assembly; the pressure chamber is also provided with a seepage inlet and a seepage outlet, wherein the seepage inlet is connected to the water inlet channel via a pipe, and the seepage outlet is connected to the water outlet channel via a pipe; Among them, the first pressure head and the second pressure head apply pressure to the shear box assembly to generate shear force on the sample assembly, the third pressure head applies pressure to the upper shear box to generate normal pressure on the sample assembly, the cabin pressure provides annular pressure to the shear box assembly, and the seepage inlet can allow high-pressure water to pass through to increase the pressure on the sample assembly.

2. The deep earth complex disturbance seepage shear test device according to claim 1 is characterized by: The shear box assembly also includes a rubber ring, which connects the upper shear box and the lower shear box together and drives the upper shear box and the lower shear box to approach each other through elastic force.

3. The deep earth complex disturbance seepage shear test device according to claim 1 is characterized by: An upper roller is installed on the top of the upper shear box. The upper roller is in rolling contact with the third pressure head. The upper roller is used to reduce the friction between the upper roller and the third pressure head.

4. The deep earth complex disturbance seepage shear test device according to claim 3 is characterized by: The upper roller is connected to the upper shear box through a return spring.

5. The deep earth complex disturbance seepage shear test device according to claim 3 is characterized by: A lower roller is installed at the bottom of the lower shear box. The lower roller is in rolling contact with the inner wall of the pressure chamber. The lower roller is used to reduce the friction between the lower roller and the inner wall of the pressure chamber.

6. The deep earth complex disturbance seepage shear test device according to claim 5 is characterized by: The lower roller is connected to the lower shear box through a return spring.

7. The deep earth complex disturbance seepage shear test device according to claim 5 is characterized by: The shear box assembly further comprises a connecting rod, both ends of which are respectively connected to the upper roller and the lower roller.

8. The deep earth complex disturbance seepage shear test device according to claim 1 is characterized by: The deep underground complex disturbance seepage shear test device also includes a water pump, a water reservoir, a flow meter and a wastewater tank. The water pump fills the water in the water reservoir into the seepage inlet. The seepage outlet is connected to the wastewater tank through the flow meter. The flow meter is used to detect the seepage amount.

9. The deep earth complex disturbance seepage shear test device according to claim 1, characterized in that: The deep underground complex disturbance seepage shear test device also includes a control system and a servo system electrically connected to each other, the first pressure head, the second pressure head, the third pressure head and the cabin pressure are all electrically connected to the servo system, and the servo system is used to control the pressure of each pressure head.

10. A test method, based on the deep earth complex disturbance seepage shear test device according to any one of claims 1 to 9, It is characterized in that include: Drilling holes in the upper sample using an electric drill to obtain a water inlet channel, drilling holes in the lower sample using an electric drill to obtain a water outlet channel, and installing joints in the water inlet channel and the water outlet channel; Spraying polyurethane material on the side of the rock mass between the first joint surface of the upper sample and the second joint surface of the lower sample, so that the polyurethane layer completely seals the first joint surface and the second joint surface; Placing the processed sample assembly between the upper shear box and the lower shear box; placing the shear box assembly together with the sample assembly in the pressure chamber; Connecting the pipe extending from the seepage inlet to the joint of the water inlet channel, and connecting the pipe extending from the seepage outlet to the joint of the water outlet channel; The pressure chamber is sealed, and oil is injected into the pressure chamber to seal the sample; Starting the first pressure head, the second pressure head, the third pressure head and the cabin pressure to apply pressure to the shear box assembly; Starting an external water supply device to increase the water pressure in the sample assembly; Start the experiment and record the data; Export the data and analyze the results, and the experiment is completed.

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