Rock complex stress and seepage water coupling effect test device and method

Abstract

The invention belongs to the technical field of rock mass engineering, and particularly relates to a rock complex stress and seepage water coupling effect testing device and method. The test device comprises: a counter-force seat, the counter-force seat comprises three counter-force surfaces, and a sample is placed on the counter-force seat; the stress cyclic loading mechanisms are respectively arranged on the other three adjacent surfaces corresponding to the test sample and are used for applying cyclic stress to one surface of the test sample; the stress cyclic loading mechanism comprises a loading cylinder, and the end part of the loading cylinder is propped against one surface of the sample; the interior of the loading cylinder is of a hollow structure, a loading piston is arranged in the loading cylinder, and loading liquid is arranged between the loading cylinder and the loading piston; the loading piston is guided to reciprocate along the axial direction of the loading cylinder, so that the loading liquid is subjected to circulating reciprocating pressure, and the loading liquid pushes the loading cylinder to apply circulating reciprocating stress to the sample. According to the test device, the complex cyclic stress action borne by the rock is simulated more truly, and a test result closer to engineering practice is obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of rock engineering, and particularly relates to a test device and method for the coupled action of complex stress and seepage water in rocks. Background Art

[0002] In the mountainous areas of southwestern China, the mountain area is large and the terrain is undulating. Most of the areas are rock distribution areas. Many large-scale hydropower stations, railways, highways, and mining projects are directly faced with rock masses. Since rock masses are part of geological bodies that have experienced deformation and damage, they are both the products of long-term geological structure actions and the products of internal and external dynamic geological actions in the later stage.

[0003] In many underground rock engineering projects, such as dam foundations, underground caverns, underground diversion tunnels and other engineering scenarios, rocks are not only subjected to complex stress actions, but also affected by seepage water; in the prior art, there is no rock mechanics test device under the coupling of seepage water and complex stress changes, so it is impossible to analyze the stability problem of rocks under the coupling action of seepage water and stress changes in this case.

[0004] Therefore, it is necessary to provide an improved technical solution to the above deficiencies in the prior art. Contents of the Invention

[0005] The purpose of the present invention is to provide a test device and method for the coupled action of complex stress and seepage water in rocks, so as to solve at least the above problems existing in the prior art.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A test device for the coupled action of complex stress and seepage water in rocks, the test device includes:

[0008] A reaction support, the reaction support includes three reaction surfaces, and the three reaction surfaces are perpendicular to each other in pairs. The specimen is placed on the reaction support, and three adjacent surfaces of the specimen are in contact with the three reaction surfaces;

[0009] A stress cyclic loading mechanism, one stress cyclic loading mechanism is respectively arranged corresponding to the other three adjacent surfaces of the specimen, and the stress cyclic loading mechanism is used to apply cyclic stress to one surface of the specimen;

[0010] The stress cyclic loading mechanism includes a loading cylinder, and the end of the loading cylinder abuts against one surface of the specimen;

[0011] The inside of the loading cylinder is a hollow structure, a loading piston is arranged in the loading cylinder, and a loading liquid is arranged between the loading cylinder and the loading piston;

[0012] The loading piston is guided to reciprocate axially along the loading cylinder, so that the loading liquid is subjected to cyclic pressure, and the loading liquid pushes the loading cylinder to apply cyclic stress to the specimen.

[0013] For the experimental device for the coupled action of complex stress and seepage water in rock as described above, preferably, the experimental device further includes a sealing chamber, and the specimen is located inside the sealing chamber;

[0014] The sealing chamber includes a sealing chamber body and a sealing chamber cover. The sealing chamber body is fixed on the reaction force seat, and the reaction surface is located inside the sealing chamber body; the sealing chamber cover is used to seal the opening position of the sealing chamber body.

[0015] For the experimental device for the coupled action of complex stress and seepage water in rock as described above, preferably, a water inlet pipe and a water outlet pipe are arranged on the sealing chamber cover, and both the water inlet pipe and the water outlet pipe extend into the bottom of the sealing chamber body;

[0016] A hydraulic pump, a solenoid valve and a hydraulic gauge are arranged on the water inlet pipe;

[0017] A solenoid valve and a hydraulic pump are arranged on the water outlet pipe.

[0018] For the experimental device for the coupled action of complex stress and seepage water in rock as described above, preferably, perforations are arranged on the surfaces of the sealing chamber cover and the sealing chamber body corresponding to the stress cyclic loading mechanism. The loading cylinder penetrates through the perforations, and one end of the loading cylinder extends into the loading chamber.

[0019] For the experimental device for the coupled action of complex stress and seepage water in rock as described above, preferably, a perforation extension section is arranged on the sealing chamber body corresponding to the perforation position, a perforation extension section is arranged on the sealing chamber cover corresponding to the perforation position, and the loading cylinder is guided to move in the perforation extension section.

[0020] For the experimental device for the coupled action of complex stress and seepage water in rock as described above, preferably, the stress cyclic loading mechanism further includes a crank and a connecting rod, and the crank is driven to rotate by a motor;

[0021] One end of the connecting rod is hinged to the crank, and the other end is hinged to the loading piston.

[0022] For the experimental device for the coupled action of complex stress and seepage water in rock as described above, preferably, a liquid inlet pipe and a liquid outlet pipe are communicated with the loading piston, and both the liquid inlet pipe and the liquid outlet pipe are communicated with the inner diameter of the loading cylinder; the other ends of the liquid inlet pipe and the liquid outlet pipe are both connected to the loading liquid tank.

[0023] For the experimental device for the coupled action of complex stress and seepage water in rock as described above, preferably, a hydraulic pump and a solenoid valve are arranged on the liquid inlet pipe, and a solenoid valve is arranged on the liquid outlet pipe;

[0024] When the loading piston moves away from the specimen, the hydraulic pump and the solenoid valve on the liquid inlet pipe are opened to replenish the loading liquid into the loading cylinder;

[0025] When the loading piston moves towards the specimen, the hydraulic pump and the solenoid valve on the liquid inlet pipe are closed, and the solenoid valve on the liquid outlet pipe is opened. After a set amount of the loading liquid is discharged from the liquid outlet pipe, the solenoid valve on the liquid outlet pipe is controlled to close.

[0026] For the experimental device for the coupled action of complex stress and seepage water in rocks as described above, preferably, at least two sealing rings are provided between the perforated extension section and the loading cylinder;

[0027] At least one sealing ring is provided between the sealing chamber body and the sealing chamber cover;

[0028] Reinforcing ribs are provided between the perforated extension section and the sealing chamber;

[0029] A plurality of through holes are provided on the reaction surface.

[0030] This application also provides a test method for the coupled action of complex stress and seepage water in rocks. The test method uses the above-mentioned experimental device for the coupled action of complex stress and seepage water in rocks. The test method includes the following steps:

[0031] Step 1: First, install the three stress cyclic loading mechanisms on the sealing chamber body and the sealing chamber cover respectively;

[0032] Step 2: Place the specimen on the reaction surface in the sealing chamber body, and then install the sealing chamber cover on the sealing chamber body;

[0033] Step 3: Open the hydraulic pump and the solenoid valve on the water inlet pipe to inject water into the sealing chamber. After the pressure in the sealing chamber measured by the hydraulic gauge reaches the set value, close the hydraulic pump and the solenoid valve on the water inlet pipe;

[0034] Step 4: Select at least one of the three stress cyclic loading mechanisms, start the motor in the stress cyclic loading mechanism, make the motor drive the crank to rotate, and make the connecting rod drive the loading piston to reciprocate in the loading cylinder;

[0035] When the loading piston moves away from the specimen, the hydraulic pump and the solenoid valve on the liquid inlet pipe are opened to replenish the loading liquid into the loading cylinder;

[0036] When the loading piston moves towards the specimen, the hydraulic pump and the solenoid valve on the liquid inlet pipe are closed, and the solenoid valve on the liquid outlet pipe is opened. After a set amount of the loading liquid is discharged from the liquid outlet pipe, control the solenoid valve on the liquid outlet pipe to close;

[0037] Step 5: Under the coupled action of cyclic stress and seepage water, end the test when the specimen is damaged to the set requirements;

[0038] Step 6: Turn off the stress cycle loading mechanism, start the hydraulic pump and solenoid valve on the outlet pipe to pump the water in the sealed chamber into the water tank, and then open the sealed chamber cover to take out the specimen.

[0039] Beneficial effects:

[0040] In this test device for the coupled action of complex stress and seepage water in rocks, when the loading piston moves away from the specimen, the hydraulic pump and solenoid valve on the inlet pipe are opened to replenish the loading liquid into the loading cylinder; when the loading piston moves towards the specimen, the hydraulic pump and solenoid valve on the inlet pipe are closed, and the solenoid valve on the outlet pipe is opened. After a set amount of the loading liquid is discharged from the outlet pipe, the solenoid valve on the outlet pipe is controlled to close; so that the loading liquid is subjected to cyclic pressure, and the pressure of the loading liquid is applied to one surface of the specimen through the loading cylinder, thereby enabling the specimen to be subjected to cyclic stress, so as to more realistically simulate the complex cyclic stress acting on the rocks in underground rock engineering, and enabling this test device to obtain test results closer to the engineering reality.

[0041] The specimen in the sealed chamber is in a seepage water environment under a certain pressure, thereby simulating the influence of seepage water under different pressures on the rocks in underground rock engineering, and further improving the accuracy of this test device.

[0042] According to the test requirements, the number of stress cycle loading mechanisms can be turned on, and at least one of them can be selected to apply cyclic stress, while the remaining stress cycle loading mechanisms apply fixed stress. At this time, the motor rotates to a fixed angle, and it is only necessary to keep the loading liquid at the set pressure. Description of the drawings

[0043] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:

[0044] Figure 1 It is a schematic structural diagram of a test device for the coupled action of complex stress and seepage water in rocks according to an embodiment of the present invention;

[0045] Figure 2 It is a partial enlarged view of the stress cycle loading mechanism according to an embodiment of the present invention.

[0046] In the figure:

[0047] 1. Reaction surface; 11. Through hole;

[0048] 2. Sealed chamber body; 21. Perforated extended section; 22. Sealing ring; 23. Reinforcing rib; 3. Sealed chamber cover; 4. Inlet pipe; 5. Outlet pipe; 6. Hydraulic pump; 7. Solenoid valve;

[0049] 8. Loading cylinder; 9. Loading piston; 10. Connecting rod; 11. Crank; 12. Liquid outlet pipe; 13. Liquid inlet pipe. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0051] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0052] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0053] According to the specific embodiments of the present invention, Figure 1-2 As shown, the present invention provides a test device for the coupling effect of complex stress in rock and seepage water, the test device comprising: a reaction seat, the reaction seat comprising three reaction surfaces 1, and the three reaction surfaces 1 are perpendicular to each other, the sample is placed on the reaction seat, and three adjacent surfaces of the sample are in contact with the three reaction surfaces 1; in this embodiment, the sample is a cubic rock sample, and the sample with a cubic structure is placed on the reaction seat to make the sample more evenly stressed.

[0054] A stress cycle loading mechanism is provided for each of the other three adjacent faces of the sample, and the stress cycle loading mechanism is used to apply cyclic stress to one face of the sample.

[0055] The stress cycle loading mechanism comprises a loading tube 8, the end of which is against one surface of the sample.

[0056] The interior of the loading cylinder 8 is a hollow structure. A loading piston 9 is arranged in the loading cylinder 8 , and a loading liquid is arranged between the loading cylinder 8 and the loading piston 9 .

[0057] The loading piston 9 is guided to reciprocate axially along the loading cylinder 8, so that the loading liquid is subjected to a cyclic pressure, and the loading liquid pushes the loading cylinder 8 to apply a cyclic stress to the specimen.

[0058] In this test device for the coupled action of complex stress and seepage water in rocks, by setting up a stress cyclic loading mechanism, the loading piston 9 reciprocates inside the loading cylinder 8, so that the loading liquid between the loading cylinder 8 and the loading piston 9 is subjected to a cyclic pressure. And the loading liquid applies the pressure it receives to one surface of the specimen through the loading cylinder 8, so that the specimen is subjected to a cyclic stress, thus more truly simulating the complex cyclic stress acting on the rocks in underground rock engineering, and enabling this test device to obtain test results closer to the engineering reality.

[0059] The test device further includes a sealing chamber, and the specimen is located inside the sealing chamber; the sealing chamber includes a sealing chamber body 2 and a sealing chamber cover 3. The sealing chamber body 2 is fixed on the reaction force seat, and the reaction surface 1 is located inside the sealing chamber body 2; the sealing chamber cover 3 is used to seal the opening position of the sealing chamber body 2.

[0060] In an embodiment of the present application, by injecting a liquid with a certain pressure into the sealing chamber, the specimen is in a seepage water environment with a certain pressure, so as to simulate the situation where the specimen is affected by seepage water in underground rock engineering, so that this test device has test results closer to the engineering reality, thereby improving the accuracy of the test results.

[0061] The sealing chamber cover 3 is provided with a water inlet pipe 4 and a water outlet pipe 5, and both the water inlet pipe 4 and the water outlet pipe 5 extend into the bottom of the sealing chamber body 2; the water inlet pipe 4 is provided with a hydraulic pump 6, a solenoid valve 7 and a hydraulic gauge; the water outlet pipe 5 is provided with a solenoid valve 7 and a hydraulic pump 6.

[0062] In an embodiment of the present application, after the sealing chamber cover 3 seals the sealing chamber body 2, the hydraulic pump 6 and the solenoid valve 7 on the water inlet pipe 4 are opened to inject water into the sealing chamber through the water inlet pipe 4, and when the pressure in the sealing chamber reaches the set value, that is, the set pressure is displayed on the hydraulic gauge, the solenoid valve 7 and the hydraulic pump 6 are closed to stop the water injection, so that the specimen in the sealing chamber is in a seepage water environment with a certain pressure, thus simulating the influence of seepage water with different pressures on the rocks in underground rock engineering, and further improving the accuracy of this test device.

[0063] In this embodiment, both the water inlet pipe 4 and the water outlet pipe 5 are communicated with a water tank (the water tank is not shown in the drawings); after the experiment is over, when it is necessary to drain the water in the sealing chamber, the hydraulic pump 6 and the solenoid valve 7 on the water outlet pipe 5 are started to pump the water in the sealing chamber into the water tank, and then the sealing chamber cover 3 is opened.

[0064] In this embodiment, both the sealing chamber body 2 and the sealing chamber cover 3 can be made of transparent materials to facilitate observing the specimens inside the sealing chamber.

[0065] On the side of the sealing chamber cover 3 corresponding to the stress cycling loading mechanism and the sealing chamber body 2, there are perforations. The loading cylinder 8 penetrates through the perforations, and one end of the loading cylinder 8 extends into the loading chamber.

[0066] In one embodiment of the present application, perforations are provided on two adjacent sides of the sealing chamber body 2 and on the sealing chamber cover 3, enabling the loading cylinder 8 to move directionally in the perforations. The perforations play a role in supporting and guiding the loading cylinder 8, facilitating the application of cyclic stress to the specimen by the loading cylinder 8.

[0067] The sealing chamber body 2 is provided with a perforation extension section 21 corresponding to the perforation position, and the sealing chamber cover 3 is provided with a perforation extension section 21 corresponding to the perforation position. The loading cylinder 8 moves directionally in the perforation extension section 21.

[0068] In one embodiment of the present application, the perforation extension section 21 is provided so that there is a larger contact area between the perforation extension section 21 and the loading cylinder 8, enabling the loading cylinder 8 to move more stably and reliably in the perforation extension section 21.

[0069] Meanwhile, the provision of the perforation extension section 21 provides a basis for arranging more sealing rings 22, thereby greatly improving the sealing performance between the perforation extension section 21 and the loading cylinder 8 to ensure that the compacting chamber can achieve a better sealing effect.

[0070] The stress cycling loading mechanism further includes a crank 11 and a connecting rod 10. The crank 11 is driven to rotate by a motor; one end of the connecting rod 10 is hinged to the crank 11, and the other end is hinged to the loading piston 9.

[0071] In one embodiment of the present application, the end of the connecting rod 10 is hinged to the central axis of the loading piston 9. By driving the crank 11 to rotate with the motor, the crank 11 drives the connecting rod 10 to move, and the connecting rod 10 drives the loading piston 9 to reciprocate in the loading cylinder 8, thereby realizing the cyclic reciprocating pressure on the loading liquid between the loading piston 9 and the loading cylinder 8. By controlling the rotation speed of the motor, the frequency of stress cycling loading can be controlled.

[0072] In this embodiment, the motor is supported by a motor bracket. Both the motor and the motor bracket are existing components and will not be elaborated here (the motor and the motor bracket are arranged at appropriate positions, and neither is shown in the drawings).

[0073] A liquid inlet pipe 13 and a liquid outlet pipe 12 are connected to the loading piston 9. Both the liquid inlet pipe 13 and the liquid outlet pipe 12 are connected to the inner diameter of the loading cylinder 8; the other ends of the liquid inlet pipe 13 and the liquid outlet pipe 12 are both connected to the loading liquid tank.

[0074] A hydraulic pump 6 and a solenoid valve 7 are provided on the liquid inlet pipe 13, and a solenoid valve 7 is provided on the liquid outlet pipe 12; when the loading piston 9 moves away from the specimen, the hydraulic pump 6 and the solenoid valve 7 on the liquid inlet pipe 13 are opened to supplement the loading liquid into the loading cylinder 8; to avoid a vacuum situation between the loading piston 9 and the loading cylinder 8, and at the same time, the loading liquid in the loading cylinder 8 always has a set pressure. The set value of the pressure of the loading liquid in the loading cylinder 8 can be adjusted by adjusting the liquid intake of the hydraulic pump 6.

[0075] When the loading piston 9 moves towards the specimen, the hydraulic pump 6 and the solenoid valve 7 on the liquid inlet pipe 13 are closed, and the solenoid valve 7 on the liquid outlet pipe 12 is opened. After a set amount of the loading liquid is discharged from the liquid outlet pipe 12, the solenoid valve 7 on the liquid outlet pipe 12 is controlled to close. Among them, since the compressibility of the loading liquid is limited, the amount of the loading liquid discharged through the liquid outlet pipe 12 can be set according to the magnitude of the cyclic stress, so as to adjust the amount of the loading liquid compressed by the loading piston 9, thereby meeting the set cyclic stress requirement needed for the experiment.

[0076] In an embodiment of the present application, the loading liquid can be an oil liquid with a suitable viscosity and model.

[0077] At least two sealing rings 22 are provided between the perforated extension section 21 and the loading cylinder 8; at least one sealing ring 22 is provided between the sealing chamber body 2 and the sealing chamber cover 3; a reinforcing rib 23 is provided between the perforated extension section 21 and the sealing chamber; a plurality of through holes 11 are provided on the reaction surface 1.

[0078] In an embodiment of the present application, a plurality of through holes 11 are provided on the reaction surface 1, so that the permeated water in the sealing chamber can contact the specimen through the through holes 11 on the reaction surface 1, enabling the specimen to better receive the coupling effect of the permeated water and the cyclic stress.

[0079] A plurality of sealing grooves are provided on the perforated extension section 21, at least one sealing groove is provided at the opening position of the sealing chamber body 2, and sealing rings 22 are provided in the sealing grooves.

[0080] By providing a reinforcing rib 23 between the perforated extension section 21 and the sealing chamber, the structural strength of the perforated extension section 21 is improved, enabling the perforated extension section 21 to more stably and reliably support the loading cylinder 8.

[0081] The present application also provides a test method for the coupling effect of complex stress and permeated water on rock. The test method uses the above-mentioned test device for the coupling effect of complex stress and permeated water on rock, and the test method includes the following steps:

[0082] Step 1, first install three stress cyclic loading mechanisms on the sealing chamber body 2 and the sealing chamber cover 3 respectively;

[0083] Step 2: Place the specimen on the reaction surface 1 in the sealed chamber body 2, and then install the sealed chamber cover 3 on the sealed chamber body 2. In this embodiment, the sealed chamber cover 3 and the sealed chamber body 2 can be connected by bolts to ensure good sealing pressure between the sealed chamber cover 3 and the sealed chamber body 2.

[0084] Step 3: Open the hydraulic pump 6 and the solenoid valve 7 on the water inlet pipe 4 to inject water into the sealed chamber. After the pressure in the sealed chamber measured by the hydraulic gauge reaches the set value, close the hydraulic pump 6 and the solenoid valve 7 on the water inlet pipe 4.

[0085] Step 4: Select at least one of the three stress cycle loading mechanisms, turn on the motor in the stress cycle loading mechanism, and make the motor drive the crank 11 to rotate, so that the connecting rod 10 drives the loading piston 9 to reciprocate in the loading cylinder 8.

[0086] When the loading piston 9 moves away from the specimen, the hydraulic pump 6 and the solenoid valve 7 on the liquid inlet pipe 13 are opened to replenish the loading liquid into the loading cylinder 8.

[0087] When the loading piston 9 moves towards the specimen, the hydraulic pump 6 and the solenoid valve 7 on the liquid inlet pipe 13 are closed, and the solenoid valve 7 on the liquid outlet pipe 12 is opened. After a set amount of the loading liquid is discharged from the liquid outlet pipe 12, control the solenoid valve 7 on the liquid outlet pipe 12 to close.

[0088] In this embodiment, according to the test requirements, the number of stress cycle loading mechanisms can be turned on. At least one of them can be selected to apply cyclic stress, and the remaining stress cycle loading mechanisms apply fixed stress. At this time, the motor rotates to a fixed angle, and the loading liquid is maintained at the set pressure.

[0089] Step 5: When the specimen is damaged to the set requirements under the coupled action of cyclic stress and seepage water, the test ends.

[0090] Step 6: Turn off the stress cycle loading mechanism, start the hydraulic pump 6 and the solenoid valve 7 on the water outlet pipe 5 to pump the water in the sealed chamber into the water tank, and then open the sealed chamber cover 3 to take out the specimen.

[0091] It can be understood that the above description is only exemplary, and the embodiments of the present application do not limit this.

[0092] The above are only the preferred embodiments of the present invention, and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are within the scope of the claims of the present invention awaiting approval.

Claims

1. A test device for the coupling effect of complex rock stress and seepage water, characterized in that: The test device comprises: A reaction seat, wherein the reaction seat comprises three reaction surfaces, and the three reaction surfaces are perpendicular to each other in pairs, and the sample is placed on the reaction seat, and three adjacent surfaces of the sample are in contact with the three reaction surfaces; A stress cycle loading mechanism, wherein one stress cycle loading mechanism is respectively provided for the other three adjacent faces of the sample, and the stress cycle loading mechanism is used to apply cyclic stress to one face of the sample; The stress cycle loading mechanism comprises a loading cylinder, an end of which is against one surface of the sample; The interior of the loading cylinder is a hollow structure, a loading piston is arranged in the loading cylinder, and a loading liquid is arranged between the loading cylinder and the loading piston; The loading piston is guided and moved back and forth along the axial direction of the loading cylinder, so that the loading liquid is subjected to cyclic reciprocating pressure, and the loading liquid pushes the loading cylinder to apply cyclic reciprocating stress to the sample.

2. The rock complex stress and seepage water coupling test device according to claim 1 is characterized in that: The experimental device also includes a sealed chamber, and the sample is located inside the sealed chamber; The sealed chamber comprises a sealed chamber body and a sealed chamber cover. The sealed chamber body is fixed on a reaction force seat, and the reaction force surface is located inside the sealed chamber body. The sealed chamber cover is used for sealing at an opening position of the sealed chamber body.

3. The rock complex stress and seepage water coupling test device according to claim 2 is characterized in that: The sealed chamber cover is provided with a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe both extend into the bottom of the sealed chamber body; The water inlet pipe is provided with a hydraulic pump, a solenoid valve and a hydraulic pressure gauge; The water outlet pipe is provided with a solenoid valve and a hydraulic pump.

4. The rock complex stress and seepage water coupling test device according to claim 2 is characterized in that: The sealing chamber cover and the sealing chamber body are provided with through holes on one side corresponding to the stress cycle loading mechanism, the loading tube passes through the through holes, and one end of the loading tube extends into the loading chamber.

5. The rock complex stress and seepage water coupling test device according to claim 4 is characterized in that: The sealing chamber body is provided with a perforation extension section corresponding to the perforation position, the sealing chamber cover is provided with a perforation extension section corresponding to the perforation position, and the loading cylinder is guided and moved in the perforation extension section.

6. The rock complex stress and seepage water coupling test device according to claim 5 is characterized in that: The stress cycle loading mechanism also includes a crank and a connecting rod, and the crank is driven to rotate by a motor; One end of the connecting rod is hinged on the crank, and the other end is hinged on the loading piston.

7. The rock complex stress and seepage water coupling test device according to claim 6 is characterized in that: The loading piston is connected with a liquid inlet pipe and a liquid outlet pipe, and the liquid inlet pipe and the liquid outlet pipe are both connected with the inner aperture of the loading cylinder; the other ends of the liquid inlet pipe and the liquid outlet pipe are both connected to the loading liquid tank.

8. The rock complex stress and seepage water coupling test device according to claim 7 is characterized in that: The liquid inlet pipe is provided with a hydraulic pump and a solenoid valve, and the liquid outlet pipe is provided with a solenoid valve; When the loading piston moves away from the sample, the hydraulic pump and the solenoid valve on the liquid inlet pipe open to replenish the loading liquid into the loading cylinder; When the loading piston moves toward the sample, the hydraulic pump and the solenoid valve on the liquid inlet pipe are closed, the solenoid valve on the liquid outlet pipe is opened, and after the loading liquid is discharged by a set amount from the liquid outlet pipe, the solenoid valve on the liquid outlet pipe is controlled to close.

9. The rock complex stress and seepage water coupling test device according to claim 5 is characterized in that: At least two sealing rings are provided between the perforated extension section and the loading cylinder; At least one sealing ring is provided between the sealing chamber body and the sealing chamber cover; A reinforcing rib is provided between the perforated extension section and the sealing chamber; The reaction surface is provided with a plurality of through holes.

10. A test method for the coupling effect of complex rock stress and seepage water, characterized in that: The experimental method uses the rock complex stress and seepage water coupling test device according to claim 8, and the experimental method includes the following steps: Step 1, first install three stress cycle loading mechanisms on the sealing chamber body and the sealing chamber cover respectively; Step 2, placing the sample on the reaction surface in the sealed chamber body, and then installing the sealed chamber cover on the sealed chamber body; Step 3, open the hydraulic pump and the solenoid valve on the water inlet pipe, inject water into the sealed chamber, and after the hydraulic pressure gauge measures that the pressure in the sealed chamber reaches the set value, close the hydraulic pump and the solenoid valve on the water inlet pipe; Step 4, selecting at least one of the three stress cycle loading mechanisms, turning on the motor in the stress cycle loading mechanism, causing the motor to drive the crank to rotate, causing the connecting rod to drive the loading piston to reciprocate in the loading cylinder; When the loading piston moves away from the sample, the hydraulic pump and the solenoid valve on the liquid inlet pipe open to replenish the loading liquid into the loading cylinder; When the loading piston moves toward the sample, the hydraulic pump and the solenoid valve on the liquid inlet pipe are closed, and the solenoid valve on the liquid outlet pipe is opened. After the loading liquid is discharged from the liquid outlet pipe by a set amount, the solenoid valve on the liquid outlet pipe is controlled to close. Step 5: Under the coupling effect of cyclic stress and infiltration water, the test is terminated when the sample is damaged to the set requirements; Step 6, close the stress cycle loading mechanism, start the hydraulic pump and solenoid valve on the water outlet pipe to pump the water in the sealed chamber into the water tank, then open the sealed chamber cover and take out the sample.

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