A rock seepage model test device and its working method

Abstract

The present invention discloses a rock seepage model test device and a working method thereof. The test device includes a sample side enclosure, which is sleeved on the outside of the sample; an excavation baffle structure, which is installed on the first side of the sample side enclosure and includes a steel grid plate and a tempered glass sheet detachably installed on the steel grid plate; a detection device, which is used to obtain the internal stress conditions of the sample; a machine base, which includes a test chamber, one side of which is provided with an opening; a pushing mechanism, which is used to push the sample side enclosure from the opening into the test chamber; a water injection device; a pressurizing device; a controller, and the detection device, the water injection device and the pressurizing device are all electrically connected to the controller. The present invention adopts a compact structural design to miniaturize the test device, and the operation is simple. It can detect the internal stress changes of the sample through the pre-buried optical fiber while reducing the impact on the sample structure; the deformation of the sample can be visually viewed through the tempered glass; the excavation position of the chamber can be freely selected, thereby increasing flexibility.

Description

Technical Field

[0001] The invention relates to a rock seepage model test device and a working method thereof in the technical field of water conservancy engineering. Background Art

[0002] The ocean has vast development space and rich natural resources, and the development of ocean resources is becoming increasingly important.

[0003] Currently, the development and utilization of marine underground space is still in the exploratory stage. However, due to the unique engineering mechanical properties of rock in the ocean, the construction of marine underground space faces great development difficulties. During the construction of marine underground space, it is very easy to induce engineering geological disasters such as large deformation of the surrounding rock and sudden water and mud inrush, which poses a series of challenges to the excavation and support of marine space engineering. Therefore, in the process of developing and utilizing marine rock underground space, it is urgent to conduct experimental research on the underground space rock mass in the multi-field coupling environment of seawater seepage field and surrounding rock stress field and deformation field, in order to analyze and evaluate its theoretical basis and solve the key scientific problem of surrounding rock stability during excavation and construction.

[0004] There are also test models for rock seepage on the market. These test models are used to conduct seepage or related mechanical tests on rock samples, and the experimental data obtained provides a reference for actual construction projects. However, these generally require the construction of a large reaction frame to complete the test, making the entire device large, complex to operate, and requiring a certain amount of learning time. Monitoring elements are generally only installed on the surface of the specimen, resulting in inaccurate sampling data, which can easily affect the final test results. The test chamber is a closed chamber, making it difficult to directly observe the deformation of the specimen. The excavation location of the chamber is generally limited to the center of the specimen, which cannot be freely selected according to the test requirements, and lacks flexibility. Summary of the Invention

[0005] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a rock seepage model test device and a working method thereof, which has a more compact structure and a simpler operation method, and at the same time has higher test detection accuracy, is convenient for observing the sample condition, and the excavation position of the chamber can be freely selected.

[0006] According to a first embodiment of the present invention, a rock seepage model test device is provided, comprising:

[0007] A sample side enclosing member is sleeved on the outside of the sample, wherein the inner wall of the sample side enclosing member is in close contact with the four sides of the sample, an excavation baffle structure is installed on a first side of the sample side enclosing member, and at least one of the remaining three sides of the sample side enclosing member is provided with a water delivery hole;

[0008] The excavation baffle structure includes a steel grid plate and a tempered glass sheet. The number of the tempered glass sheets is consistent with the number of grids of the steel grid plate and is arranged in a one-to-one correspondence. The tempered glass sheet can be detachably installed in each grid of the steel grid plate.

[0009] A detection device comprising an optical fiber, a fiber Bragg grating sensor, and a fiber Bragg grating modem, wherein the fiber Bragg grating sensor is embedded in the sample, one end of the optical fiber is connected to the fiber Bragg grating sensor, and the other end of the optical fiber extends along the grid of the steel grid plate to the outside and is connected to the fiber Bragg grating modem for monitoring;

[0010] The machine base comprises a base and a test chamber, wherein the test chamber is mounted on the base, one side of the test chamber is provided with an opening, and the sample side surrounding member can carry the sample into the test chamber through the opening;

[0011] A pushing mechanism, comprising a pushing plate, the pushing plate being capable of covering the opening, the pushing plate being in contact with the first side surface of the sample side enclosure member, and the middle portion of the pushing plate being hollowed out to expose the excavation baffle structure;

[0012] A water injection device, comprising a hydraulic cylinder, the hydraulic cylinder being connected to the test chamber and used to inject water from the water delivery hole to the surface of the sample;

[0013] A pressurizing device, comprising a pressure plate and a power cylinder, wherein the pressure plate contacts the top surface or the bottom surface of the specimen, and the two ends of the power cylinder are respectively connected to the pressure plate and the test chamber, and is used to push the pressure plate toward the specimen to generate pressure on the specimen;

[0014] The controller is electrically connected to the detection device, the water injection device and the pressurizing device.

[0015] According to an embodiment of the first aspect of the present invention, further, the pushing mechanism also includes a pull rod, the two ends of which are respectively connected to the push plate and the test chamber, and the pull rod is used to drive the push plate to push the sample side enclosure with the sample installed into the test chamber along the opening, and the pull rod is electrically connected to the controller.

[0016] According to an embodiment of the first aspect of the present invention, the pushing mechanism further includes a guide foot plate, which is provided with a first contact surface and a second contact surface that are adjacent and perpendicular to each other, the first contact surface is connected to the push plate, and the second contact surface is in sliding contact with the base, for maintaining the verticality of the push plate to the base during movement.

[0017] According to an embodiment of the first aspect of the present invention, further, the second side surface and the third side surface of the sample side surrounding member adjacent to the first side surface are both provided with water delivery holes, and the hydraulic cylinder injects water into both sides of the sample from the two water delivery holes at the same time.

[0018] According to an embodiment of the first aspect of the present invention, further, a water inlet grid plate is installed on the water delivery hole.

[0019] According to an embodiment of the first aspect of the present invention, further, the water injection device also includes a sealing pressure plate, the hydraulic cylinder is embedded in the sealing pressure plate, and the sealing pressure plate is tightly attached to the test chamber to reduce water overflow.

[0020] According to an embodiment of the first aspect of the present invention, further, the water injection device also includes a water pressure sensor, which is installed inside the test chamber to detect water pressure, and the water pressure sensor is electrically connected to the controller.

[0021] According to an embodiment of the first aspect of the present invention, further, the pressurizing device further includes a pressure sensor, which is installed on the pressure plate to detect the pressure applied by the pressure plate to the sample, and the pressure sensor is electrically connected to the controller.

[0022] According to a second embodiment of the present invention, there is provided a working method based on the rock seepage model test device, comprising:

[0023] Making a sample, determining the excavation position of the chamber in the sample, and when casting the sample, pre-embedding the fiber optic Bragg grating sensor at the pre-embedded position around the chamber according to the test plan;

[0024] The sample is installed in the sample side enclosure, one end of the optical fiber is led out from the pre-buried position, the optical fiber is led out to the outside along the grid of the steel grid plate and connected to a fiber Bragg grating modem for monitoring;

[0025] The sample side enclosing member with the sample installed thereon is placed into the test chamber, and the push plate abuts against the first side surface of the sample side enclosing member;

[0026] Remove the tempered glass sheet covering the excavation location of the chamber;

[0027] Starting the water injection device and the pressurizing device to inject water and apply pressure to the sample;

[0028] Excavation is performed at a preset chamber excavation location using excavation equipment, and data collected by the fiber optic Bragg grating sensor is recorded. At the same time, the excavation process is recorded through the tempered glass sheet using a high-speed camera;

[0029] After excavation is completed, the excavation equipment is withdrawn from the chamber, and the chamber is left to stand to observe whether there is water seeping into the chamber, and the amount of water seepage is recorded;

[0030] After the test is completed, the water injection device and the pressurizing device are closed, and the sample side enclosure member with the sample installed is removed from the test chamber;

[0031] removing the sample from the sample side surrounding member;

[0032] Clean the test chamber and the side parts of the sample and wait for the next test.

[0033] According to an embodiment of the second aspect of the present invention, further, there are multiple fiber grating sensors, which are respectively arranged at positions one, two and three times the diameter of the chamber away from the central axis of the chamber.

[0034] The beneficial effects of the embodiments of the present invention include at least: the present invention adopts a compact structural design to miniaturize the test device, and has a simple operation method. It can detect the internal stress changes of the sample through the pre-buried optical fiber while reducing the impact on the sample structure; the deformation of the sample can be visually viewed through tempered glass; the excavation position of the chamber can be freely selected, thereby increasing flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments. Obviously, the drawings described only illustrate some embodiments of the present invention, not all of them. Those skilled in the art can derive other design solutions and drawings based on these drawings without inventive effort.

[0036] Figure 1 is a three-dimensional diagram of a rock seepage model test device according to an embodiment of the first aspect of the present invention;

[0037] Figure 2 is a three-dimensional diagram of the sample side enclosure 100 in the rock seepage model test device according to the first embodiment of the present invention;

[0038] Figure 3 1 is a front view of a sample side enclosure 100 in a rock seepage model test device according to an embodiment of the first aspect of the present invention;

[0039] Figure 4 2 is a side view of an excavation baffle structure 200 in a rock seepage model test device according to an embodiment of the first aspect of the present invention;

[0040] Figure 5 It is a schematic diagram of setting the pre-buried position 820 of the sample 800 in the working method of the rock seepage model test device according to the second embodiment of the present invention.

[0041] Figure markings: 100-specimen side enclosure, 110-first side, 120-second side, 130-third side, 140-water supply hole, 141-water inlet grid plate, 200-excavation baffle structure, 210-steel grid plate, 220-tempered glass sheet, 300-detection device, 310-optical fiber, 400-machine base, 410-base, 420-test chamber, 421-opening, 500-pushing mechanism, 510-push plate, 520-pull rod, 530-guide foot plate, 531-first contact surface, 532-second contact surface, 600-water injection device, 610-hydraulic cylinder, 620-sealing pressure plate, 700-pressurizing device, 710-pressure plate, 720-power cylinder, 800-specimen, 810-chamber, 820-embedded position. DETAILED DESCRIPTION

[0042] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention 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 invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that descriptions involving orientations, 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. They are only for the convenience of describing the present invention 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. Therefore, they cannot be understood as limitations on the present invention.

[0044] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0045] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting 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 the present invention based on the specific content of the technical solution.

[0046] Reference Figure 1 The rock seepage model test device in the embodiment of the first aspect of the present invention includes a sample side enclosure 100, an excavation baffle structure 200, a detection device 300, a machine base 400, a pushing mechanism 500, a water injection device 600 and a pressurizing device 700. The sample side enclosure 100 is a frame, referring to Figure 2The sample side enclosure 100 is fitted around the outside of the sample 800. The inner walls of the sample side enclosure 100 are in close contact with the four sides of the sample 800, leaving the top and bottom of the sample 800 exposed. One side of the sample side enclosure 100 is designated as a first side 110, and an excavation baffle structure 200 is mounted on the first side 110 of the sample side enclosure 100. A water delivery hole 140 is provided on at least one of the remaining three sides of the sample side enclosure 100, allowing water to be injected into the surface of the sample 800 through the water delivery hole 140 by the water injection device 600.

[0047] The excavation baffle structure 200 is used to guide the excavation of the chamber 810 containing the specimen 800 and to secure the specimen 800 during the excavation process. The excavation baffle structure 200 comprises a steel mesh panel 210 and tempered glass sheets 220. The steel mesh panel 210 is welded from steel bars, and snaps are provided along the edges of the meshes. The number of tempered glass sheets 220 matches the number of meshes in the steel mesh panel 210, and each is detachably connected to the steel mesh panel 210 via snaps. During actual use, the tempered glass sheet 220 covering the intended excavation location in the chamber 810 can be removed to facilitate excavation. The remaining tempered glass sheets 220 are placed against the surface of the specimen 800 to secure it, allowing the experimenter to observe the surface of the specimen 800 through the tempered glass sheets 220.

[0048] The detection device 300 is used to collect stress changes of the sample 800 during the excavation process of the chamber 810, and includes an optical fiber 310, a fiber Bragg grating sensor and a fiber Bragg grating modem. Figures 3 and 4 The fiber Bragg grating sensor is embedded in the sample 800. Its volume is relatively small compared to the sample itself, thus minimizing damage to the sample's interior. One end of the optical fiber 310 is connected to the fiber Bragg grating sensor, while the other end extends along the mesh of the steel mesh plate 210 to the outside and connects to the fiber Bragg grating modem. The lead-out position is sealed with epoxy resin or an alcohol-rosin solution. The fiber Bragg grating modem is connected to each optical fiber 310 to obtain the internal stress conditions of the sample 800. The structure and operating principle of the fiber Bragg grating sensor are prior art and will not be elaborated here.

[0049] The machine base 400 is the main structure of the rock seepage simulation test device. The machine base 400 includes a base 410 and a test chamber 420. The test chamber 420 is installed on the base 410, and an opening 421 is provided on one side of the test chamber 420. The sample side enclosure 100 can carry the sample 800 into the test chamber 420 through the opening 421 and complete the seepage test in the test chamber 420.

[0050] The pushing mechanism 500 includes a push plate 510 that can move and cover the opening 421. The push plate 510 contacts the first side surface 110 of the sample side enclosure 100 and applies a thrust force to drive the sample side enclosure 100 to move. The middle portion of the push plate 510 is hollowed out to expose the excavation baffle structure 200 to prevent obstruction to subsequent excavation work.

[0051] Furthermore, the pushing mechanism 500 also includes a pull rod 520, which is a telescopic rod electrically connected to the controller and capable of generating a driving force. The pull rod 520 is connected at both ends to the push plate 510 and the test chamber 420, respectively. The pull rod 520 is used to drive the push plate 510 to push the specimen side enclosure 100, with the specimen 800 mounted thereon, along the opening 421 into the test chamber 420. This reduces the workload of the experimenter loading the specimen 800 and facilitates the test. It will be readily understood that the pull rod 520 can be an electric pull rod, a hydraulic pull rod, a pneumatic pull rod, or another telescopic rod structure, which will not be further described here.

[0052] Furthermore, the pushing mechanism 500 also includes a guide foot plate 530, which is provided with a first contact surface 531 and a second contact surface 532 that are adjacent and perpendicular to each other. The first contact surface 531 is connected to the push plate 510, and the second contact surface 532 is in sliding contact with the base, which is used to maintain the verticality of the push plate 510 and the base 410 during the movement, thereby reducing the inclination of the push plate 510.

[0053] Water injection device 600 is used to inject water into the surface of specimen 800 to simulate the high water pressure environment underwater. Water injection device 600 includes a hydraulic cylinder 610, which is connected to test chamber 420 and is used to inject water from water delivery hole 140 into the surface of specimen 800, so that the sides and upper and lower surfaces of specimen 800 are all immersed in water.

[0054] Specifically, the second side 120 and the third side 130 adjacent to the first side 110 on the sample side enclosure 100 are both provided with water supply holes 140. The hydraulic cylinder 610 injects water from the two water supply holes 140 to both sides of the sample 800 at the same time, thereby balancing the water pressure on both sides, improving the water injection efficiency, and reducing the waiting time of the water injection process.

[0055] Furthermore, a water inlet grid plate 141 is installed on the water delivery hole 140 to guide the water flow to the side of the sample 800.

[0056] Furthermore, the water injection device 600 also includes a sealing pressure plate 620, and the hydraulic cylinder 610 is embedded in the sealing pressure plate 620 to achieve fixation. The sealing pressure plate 620 is tightly attached to the test chamber 420 to reduce water overflow and achieve a better sealing effect.

[0057] Furthermore, the water injection device 600 also includes a water pressure sensor, which is installed inside the test chamber 420 to detect water pressure. The water pressure sensor is electrically connected to the controller, so that it can obtain water pressure data in the test chamber 420 and implement closed-loop control of the hydraulic cylinder 610 to improve control accuracy.

[0058] The pressurizing device 700 is used to apply pressure to the sample 800 to simulate the load-bearing environment of the island structure. The pressurizing device 700 includes a pressure plate 710 and a power cylinder 720. The pressure plate contacts the top surface or bottom surface of the sample 800, and the two ends of the power cylinder 720 are respectively connected to the pressure plate 710 and the test chamber 420. When the power cylinder 720 is started, it pushes the pressure plate 710 to move toward the sample 800, thereby applying pressure to the sample 800. Specifically, the power cylinder 720 uses servo hydraulics as power, including a bidirectional high-pressure servo oil pump, a servo motor and drive, an integrated manifold valve group and a closed oil tank. The servo motor speed, oil pump flow and system pressure are controlled by a stepless servo. This is a prior art, and the specific structure and working principle will not be repeated here.

[0059] Furthermore, the pressurizing device 700 also includes a pressure sensor, which is installed on the pressure plate 710 to detect the pressure applied by the pressure plate 710 to the sample 800. The pressure sensor is electrically connected to the controller to implement closed-loop control of the power cylinder 720 to improve control accuracy.

[0060] The controller is used to control the rock seepage simulation test device and collect data. The detection device 300, the water injection device 600 and the pressurizing device 700 are all electrically connected to the controller.

[0061] The working method of the second embodiment of the present invention, based on the above-mentioned rock seepage model test device, includes the following steps:

[0062] S100 production sample 800, determine the sample 800 chamber 810 excavation position, when casting the sample, the fiber Bragg grating sensor in accordance with the test plan in the chamber 810 around the embedded position 820 pre-embedded;

[0063] S200. The sample 800 is installed in the sample side enclosure 100. One end of the optical fiber 310 is connected to the fiber Bragg grating sensor, and the other end is led out through the pre-buried position 820 and led out along the grid of the steel grid plate 210 to the external fiber Bragg grating modem for monitoring;

[0064] S300. The sample side surrounding member 100 with the sample 800 is placed into the test chamber 420, and the push plate 510 abuts against the first side surface 110 of the sample side surrounding member 100;

[0065] S400. Remove the tempered glass sheet 220 covering the excavation position of the chamber 810;

[0066] S500 starts the water injection device 600 and the pressurizing device 700, injects water and applies pressure to the sample 800 to reach the rated water pressure and pressure;

[0067] S600. Excavation equipment is used to excavate the preset excavation position of the chamber 810, and the data collected by the fiber grating sensor is recorded. At the same time, through the tempered glass sheet 220, a high-speed camera is used to record the excavation process;

[0068] S700. After excavation is completed, the excavation equipment is withdrawn from the chamber 810, and the chamber is left to stand and observe whether water has seeped into the chamber 810, and the amount of water seepage is recorded;

[0069] S800. After the test is completed, the water injection device 600 and the pressurizing device 700 are turned off, and the sample side surrounding member 100 with the sample 800 is removed from the test chamber 420;

[0070] S900. The sample 800 is removed from the sample side surrounding member 100;

[0071] S1000. Clean the test chamber 420 and the sample side parts 100 and wait for the next test.

[0072] Further, refer to Figures 3 to 5 There are multiple fiber grating sensors, which are respectively arranged at positions one, two and three times the diameter of the chamber 810 away from the central axis.

[0073] The above is a specific description of the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A rock seepage model test device, characterized in that: include: A sample side enclosing member is sleeved on the outside of the sample, wherein the inner wall of the sample side enclosing member is in close contact with the four sides of the sample, an excavation baffle structure is installed on a first side of the sample side enclosing member, and at least one of the remaining three sides of the sample side enclosing member is provided with a water delivery hole; The excavation baffle structure includes a steel grid plate and a tempered glass sheet. The number of the tempered glass sheets is consistent with the number of grids of the steel grid plate and is arranged in a one-to-one correspondence. The tempered glass sheet can be detachably installed in each grid of the steel grid plate. A detection device comprising an optical fiber, a fiber Bragg grating sensor, and a fiber Bragg grating modem, wherein the fiber Bragg grating sensor is embedded in the sample, one end of the optical fiber is connected to the fiber Bragg grating sensor, and the other end of the optical fiber extends along the grid of the steel grid plate to the outside and is connected to the fiber Bragg grating modem for monitoring; The machine base comprises a base and a test chamber, wherein the test chamber is mounted on the base, one side of the test chamber is provided with an opening, and the sample side surrounding member can carry the sample into the test chamber through the opening; A pushing mechanism, comprising a pushing plate, the pushing plate being capable of covering the opening, the pushing plate being in contact with the first side surface of the sample side enclosure member, and the middle portion of the pushing plate being hollowed out to expose the excavation baffle structure; A water injection device, comprising a hydraulic cylinder, the hydraulic cylinder being connected to the test chamber and used to inject water from the water delivery hole to the surface of the sample; A pressurizing device, comprising a pressure plate and a power cylinder, wherein the pressure plate contacts the top surface or the bottom surface of the specimen, and the two ends of the power cylinder are respectively connected to the pressure plate and the test chamber, and is used to push the pressure plate toward the specimen to generate pressure on the specimen; The controller is electrically connected to the detection device, the water injection device and the pressurizing device.

2. The rock seepage model test device according to claim 1, characterized in that: The pushing mechanism also includes a pull rod, the two ends of which are respectively connected to the push plate and the test chamber. The pull rod is used to drive the push plate to push the sample side enclosure with the sample installed into the test chamber along the opening. The pull rod is electrically connected to the controller.

3. The rock seepage model test device according to claim 2, characterized in that: The pushing mechanism also includes a guide foot plate, which is provided with a first contact surface and a second contact surface that are adjacent and perpendicular to each other. The first contact surface is connected to the push plate, and the second contact surface is in sliding contact with the base, which is used to maintain the verticality of the push plate and the base during movement.

4. The rock seepage model test device according to claim 1, characterized in that: The second side surface and the third side surface of the sample side surrounding member adjacent to the first side surface are both provided with water delivery holes, and the hydraulic cylinder injects water into both sides of the sample from the two water delivery holes at the same time.

5. The rock seepage model test device according to claim 4, characterized in that: A water inlet grid plate is installed on the water delivery hole.

6. The rock seepage model test device according to claim 1, characterized in that: The water injection device further comprises a sealing pressure plate, the hydraulic cylinder is embedded in the sealing pressure plate, and the sealing pressure plate is closely attached to the test chamber to reduce water overflow.

7. The rock seepage model test device according to claim 1, characterized in that: The water injection device further includes a water pressure sensor, which is installed inside the test chamber to detect water pressure. The water pressure sensor is electrically connected to the controller.

8. The rock seepage model test device according to claim 1, characterized in that: The pressurizing device further includes a pressure sensor, which is installed on the pressure plate to detect the pressure applied by the pressure plate to the sample, and the pressure sensor is electrically connected to the controller.

9. A working method based on the rock seepage model test device according to any one of claims 1 to 8, characterized in that: include: Making a sample, determining the excavation position of the chamber in the sample, and when casting the sample, pre-embedding the fiber optic Bragg grating sensor at the pre-embedded position around the chamber according to the test plan; The sample is installed in the sample side enclosure, one end of the optical fiber is led out from the pre-buried position, the optical fiber is led out to the outside along the grid of the steel grid plate and connected to a fiber Bragg grating modem for monitoring; The sample side enclosing member with the sample installed thereon is placed into the test chamber, and the push plate abuts against the first side surface of the sample side enclosing member; Remove the tempered glass sheet covering the excavation location of the chamber; Starting the water injection device and the pressurizing device to inject water and apply pressure to the sample; Excavation is performed at a preset chamber excavation location using excavation equipment, and data collected by the fiber optic Bragg grating sensor is recorded. At the same time, the excavation process is recorded through the tempered glass sheet using a high-speed camera; After excavation is completed, the excavation equipment is withdrawn from the chamber, and the chamber is left to stand to observe whether there is water seeping into the chamber, and the amount of water seepage is recorded; After the test is completed, the water injection device and the pressurizing device are closed, and the sample side enclosure member with the sample installed is removed from the test chamber; removing the sample from the sample side surrounding member; Clean the test chamber and the side parts of the sample and wait for the next test.

10. The operating method of the rock seepage model test device according to claim 9, characterized in that: There are multiple fiber grating sensors, which are respectively arranged at positions one, two and three times the diameter of the chamber away from the central axis of the chamber.

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