A tunnel excavation surrounding rock water seepage test device

Abstract

The application relates to the technical field of surrounding rock water seepage tests, and discloses a tunnel excavation surrounding rock water seepage test device, which comprises a box body, a water collecting groove is arranged at the bottom of the box body, a filter plate is fixedly connected to the middle part of the water collecting groove, a measuring cylinder is clamped to the bottom of the water collecting groove, and a cylinder taking opening is arranged at the right side of the box body. The liquid in the arc-shaped shell enters the inside of the liquid inlet shell, so that the push rod slides to the outside, the push rod drives the sliding rod to slide to the outside, the limiting inclined block is driven to slide to the outside, the limiting inclined block no longer limits the baffle, the compression spring drives the T-shaped rod to move upwards, the liquid is pushed to drive the baffle to move upwards, the rapid unloading is completed, the water on the left side of the surrounding rock is collected in the inside of the measuring cylinder, the water quantity change in the inside of the measuring cylinder is observed, the seepage characteristics of the surrounding rock after rapid unloading are obtained, and the problem that the water seepage of the surrounding rock after tunnel unloading under different stress states is simulated is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of surrounding rock water seepage test, and particularly relates to a tunnel excavation surrounding rock water seepage test device. BACKGROUND

[0002] In order to shorten the distance and avoid large ramps, tunnels are often built under mountains or hills. When building tunnels in mountains, rock excavation is needed in rock underground engineering, which changes the surrounding rock and forms surrounding rock. With the rapid development of deep geotechnical engineering, underground caverns or tunnels begin to develop in depth, showing the trend of high burial depth, high ground stress and high permeation pressure. When the tunnel is excavated, the original rock stress of the excavation face is released completely or partially, which destroys the original mechanical balance state and leads to redistribution of rock stress, thereby affecting the deformation of surrounding rock. At present, many scholars have carried out a series of indoor simulation experiments on tunnel excavation unloading, such as conventional triaxial test and true triaxial test. Among them, the experimental test piece is mostly a cubic or cylindrical rock sample, which simulates tunnel excavation unloading by unloading confining pressure, increasing axial pressure or simultaneously unloading confining pressure and axial pressure. Engineering practice shows that there is a certain gap between the above stress excavation unloading path and the stress state change of surrounding rock during tunnel excavation. Tunnel excavation is characterized by rapid unloading, and unloading is followed by support and lining. At present, the indoor simulation excavation unloading experiment only studies the unloading path, and does not consider the problem of surrounding rock water seepage after tunnel unloading under different stress states. SUMMARY

[0003] The present application provides a tunnel excavation surrounding rock water seepage test device, which has the advantages of simulating the water seepage of surrounding rock after tunnel unloading under different stress states, to solve the problems mentioned in the background.

[0004] To achieve the above purpose, the present application adopts the following technical scheme: a tunnel excavation surrounding rock water seepage test device, comprising a box body, a water collecting groove is formed in the bottom of the box body, a filter plate is fixedly connected to the middle of the water collecting groove, a measuring cylinder is clamped to the bottom of the water collecting groove, a cylinder taking port is formed in the right side of the box body, two rectangular columns are fixedly connected inside the box body; two connecting columns are provided, a liquid channel is formed in the inside of the connecting column, an arc-shaped shell is fixedly connected between the two connecting columns, a rectangular ring is fixedly installed inside the arc-shaped shell, a partition plate is arranged above the rectangular ring, two T-shaped rods are slidably connected to the bottom of the arc-shaped shell, an extrusion plate is fixedly connected to the bottom of the two T-shaped rods, a pressure sensor is fixedly installed on the lower surface of the extrusion plate, and a compression spring is arranged between the arc-shaped shell and the T-shaped rod; a feeding mechanism is arranged at the bottom of the box body; two telescopic mechanisms are arranged on the left and right sides of the arc-shaped shell.

[0005] Preferably, the left side of the upper surface of the box is movably provided with a sealing cover plate, a water pressure sensor is arranged below the sealing cover plate, and an air pump is fixedly arranged on the left side of the box, and a gas supply pipe is in communication with the upper side of the air pump.

[0006] Preferably, the supply mechanism comprises a liquid storage cavity, a liquid pump, and a sliding cavity, a liquid suction pipe is fixedly connected to the rear portion of the liquid pump, connecting pipes are in communication with the front and rear portions of the sliding cavity, a lower control valve is fixedly connected to the middle portion of the connecting pipe, a limiting block is fixedly connected to the inside of the sliding cavity, and a multi-stage telescopic plate is slidably connected to the top portion of the sliding cavity.

[0007] Preferably, the telescopic mechanism comprises a liquid inlet shell and two sleeve sleeves, an upper control valve is arranged on the inner side of the liquid inlet shell, a push rod is slidably connected to the outer side of the liquid inlet shell, slide rods are fixedly connected to the front and rear ends of the push rod, a limiting inclined block is fixedly connected to the inner end of the slide rod, and a reset spring is arranged between the sleeve sleeve and the limiting inclined block. The above structure can open multiple upper control valves during work, so that the liquid in the arc-shaped shell enters the inside of the liquid inlet shell, thereby making the push rod slide outward, the push rod drives the slide rod to slide outward, thereby driving the limiting inclined block to slide outward and compress the reset spring. Then, the limiting inclined block no longer limits the baffle, the compression spring drives the T-shaped rod to move upward, thereby driving the liquid to drive the baffle to move upward, thereby completing rapid unloading. The water on the left side of the surrounding rock is collected in the graduated cylinder through the surrounding rock, and the permeability of the surrounding rock after rapid unloading is obtained by observing the change of the water amount in the graduated cylinder, thereby solving the problem of simulating the water permeation of the surrounding rock after unloading of the tunnel under different stress states.

[0008] Preferably, the connecting column is fixedly connected with the box, the compression spring is fixedly connected with the arc-shaped shell and the T-shaped rod, the two liquid channels are in communication with the arc-shaped shell, and the T-shaped rod is slidably connected with the arc-shaped shell.

[0009] Preferably, the water pressure sensor is fixedly connected with the box, and the gas supply pipe is in communication with the space below the sealing cover plate.

[0010] Preferably, the liquid storage cavity and the sliding cavity are both arranged in the interior of the box body, the liquid suction pipe is arranged in the interior of the liquid storage cavity, the liquid pump is fixedly connected with the box body, the left end of the front connecting pipe is communicated with the liquid outlet of the liquid pump, the left end of the rear connecting pipe is communicated with the liquid storage cavity, and the right ends of the two connecting pipes are both communicated with the liquid channel on the same side.

[0011] Preferably, the liquid inlet shell and the two sleeve sleeves are fixedly connected with the arc-shaped shell, the upper control valve is in an open state, the liquid inlet shell is communicated with the arc-shaped shell, and the sliding rod is slidably connected with the sleeve sleeve.

[0012] Preferably, the inner side of the two rectangular columns is provided with a sliding groove matched with the multi-stage telescopic plate.

[0013] The beneficial effects of the present application are as follows: 1. The upper control valve is opened, the liquid in the arc-shaped shell enters the interior of the liquid inlet shell, the push rod slides outward, the sliding rod slides outward, the limiting inclined block slides outward and presses the reset spring, the limiting inclined block no longer limits the partition plate, the compression spring pushes the T-shaped rod to move upward, the liquid pushes the partition plate to move upward, the rapid unloading is completed, the water on the left side of the surrounding rock is collected in the measuring cylinder, the change of the water amount in the measuring cylinder is observed, the permeation characteristics of the surrounding rock after rapid unloading are obtained, and the problem of simulating the water permeation of the surrounding rock after unloading of the tunnel under different stress states is solved.

[0014] 2. The liquid pump works, the liquid in the liquid storage cavity is supplied to the interior of the arc-shaped shell through the connecting pipe and the liquid channel, the lower control valve on the rear side is in a closed state, the partition plate is limited by the plurality of limiting inclined blocks, the two T-shaped rods move downward and press the compression spring, the T-shaped rod moves downward and drives the pressing plate and the pressure sensor to move downward, the pressing plate presses the surrounding rock directly below, and the pressure sensor records the pressure applied by the pressing plate; when the applied pressure is a target value, the target depth stone is simulated, and the water permeation test of the stone at different depths is carried out.

[0015] 3、The present application injects appropriate amount of water to the left space of the multi-stage telescopic plate when the multi-stage telescopic plate is in the extended state, the air pump works to supply gas to the upper space of the water, when the water pressure sensor detects that the pressure of the water is the target value, thereby simulating the water pressure of the target depth, then the multi-stage telescopic plate retracts the top which will be flush with the lower surface of the rectangular column, at this time, the water will contact with the surrounding rock on the right side and begin to slowly seep, the seepage test begins, during the process, the air pump will pump gas into the space above the liquid surface, so that the water pressure detected by the water pressure sensor is always the preset value, thereby the seepage test of the surrounding rock under different water pressures is carried out. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which constitute a part of this specification, illustrate embodiments of the present disclosure and serve to explain the principles of the present disclosure in a context in which the disclosure can be understood more readily.

[0017] The present disclosure can be understood more readily by reference to the following detailed description, taken in connection with the accompanying drawings, in which:

[0018] Figure 1 is a schematic diagram of the overall appearance of the present application;

[0019] Figure 2 is a semi-partial view of the box of the present application;

[0020] Figure 3 is a semi-partial view of the multi-stage telescopic plate of the present application;

[0021] Figure 4 is a semi-partial view of the connecting column of the present application;

[0022] Figure 5 is a semi-partial view of the arc-shaped shell of the present application;

[0023] Figure 6 is Figure 5 is an enlarged view of position A in the middle;

[0024] Figure 7 is a top view of the arc-shaped shell of the present application;

[0025] Figure 8 is a semi-partial view of the liquid storage cavity of the present application.

[0026] Wherein: 1, box; 2, water collecting tank; 3, filter plate; 4, measuring cylinder; 5, take cylinder port; 6, rectangular column; 7, connecting column; 8, arc shell; 9, rectangular ring; 10, partition; 11, T-shaped rod; 12, extrusion plate; 13, pressure sensor; 14, feeding mechanism; 141, liquid storage cavity; 142, liquid pump; 143, sliding cavity; 144, liquid suction tube; 145, connecting pipe; 146, lower control valve; 147, limit block; 148, multi-stage telescopic plate; 15, telescopic mechanism; 151, liquid inlet shell; 152, upper control valve; 153, push rod; 154, slide rod; 155, limit inclined block; 156, cylinder sleeve; 157, return spring; 16, sealing cover plate; 17, water pressure sensor; 18, air pump; 19, air supply pipe; 20, compression spring; 21, liquid channel. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0028] Please refer to Figures 1-8 The present application discloses a tunnel excavation surrounding rock water seepage test device, which comprises a box 1, a water collecting tank 2 is formed in the bottom of the box 1, a filter plate 3 is fixedly connected to the middle part of the water collecting tank 2, a measuring cylinder 4 is clamped to the bottom of the water collecting tank 2, a take cylinder port 5 is formed in the right side surface of the box 1, and two rectangular columns 6 are fixedly connected inside the box 1; two connecting columns 7 are arranged, a liquid channel 21 is formed in the inside of the connecting column 7, an arc shell 8 is fixedly connected between the two connecting columns 7, a rectangular ring 9 is fixedly installed inside the arc shell 8, a partition 10 is arranged above the rectangular ring 9, two T-shaped rods 11 are slidingly connected to the bottom of the arc shell 8, an extrusion plate 12 is fixedly connected to the bottom of the two T-shaped rods 11, a pressure sensor 13 is fixedly installed on the lower surface of the extrusion plate 12, and a compression spring 20 is arranged between the arc shell 8 and the T-shaped rod 11; a feeding mechanism 14 is arranged at the bottom of the box 1; two telescopic mechanisms 15 are arranged on the left and right sides of the arc shell 8.

[0029] The left side of the upper surface of the box body 1 is movably provided with a sealing cover plate 16, the lower side of the sealing cover plate 16 is provided with a water pressure sensor 17, the left side of the box body 1 is fixedly provided with an air pump 18, and the upper side of the air pump 18 is communicated with a gas supply pipe 19, and the air pump 18 works to supply gas to the upper space of the water, and when the water pressure sensor 17 detects that the pressure of the water is a target value, the water pressure of the target depth is simulated, then the multi-stage telescopic plate 148 retracts the top to be flush with the lower surface of the rectangular column 6, at this time, the water contacts the surrounding rock on the right side and begins to slowly seep, and the water seepage test begins, and in the process, the air pump 18 pumps gas into the space above the liquid surface, so that the water pressure detected by the water pressure sensor 17 is always a preset value, so that the water seepage test of the surrounding rock under different water pressures is carried out.

[0030] The feeding mechanism 14 comprises a liquid storage cavity 141, a liquid pump 142 and a sliding cavity 143, the rear part of the liquid pump 142 is fixedly connected with a liquid suction pipe 144, the front and rear parts of the sliding cavity 143 are communicated with connecting pipes 145, the middle part of the connecting pipe 145 is fixedly connected with a lower control valve 146, the inside of the sliding cavity 143 is fixedly connected with a limiting block 147, and the top of the sliding cavity 143 is slidably connected with a multi-stage telescopic plate 148, and the lower control valve 146 on the front side is in a state of communicating the liquid pump 142 with the liquid channel 21, the liquid pump 142 works to supply the liquid in the liquid storage cavity 141 to the inside of the arc-shaped shell 8 through the connecting pipe 145 and the liquid channel 21, the lower control valve 146 on the rear side is in a closed state, and the partition plate 10 is limited by the plurality of limiting inclined blocks 155, with the liquid being continuously supplied to the inside of the arc-shaped shell 8, the two T-shaped rods 11 move downward and press the compression springs 20, and the downward movement of the T-shaped rods 11 drives the extrusion plates 12 and the pressure sensor 13 to move downward.

[0031] The telescopic mechanism 15 includes an inlet housing 151 and two sleeves 156. An upper control valve 152 is located inside the inlet housing 151, and a push rod 153 is slidably connected to the outer side of the inlet housing 151. Slide rods 154 are fixedly connected to both ends of the push rod 153, and a limit block 155 is fixedly connected to the inner end of the slide rod 154. A return spring 157 is provided between the sleeves 156 and the limit block 155. Its function is that, by opening the multiple upper control valves 152, liquid inside the arc-shaped shell 8 enters the interior of the inlet housing 151, causing the push rod 153 to slide outwards. 153 will cause the slide bar 154 to slide outward, thereby causing the limiting inclined block 155 to slide outward and squeeze the reset spring 157. Subsequently, the limiting inclined block 155 will no longer limit the partition 10, and the compression spring 20 will push the T-shaped rod 11 to move upward, thereby pushing the liquid to move the partition 10 upward, thus completing the rapid unloading. Observe the water on the left side of the surrounding rock passing through the surrounding rock and being collected inside the measuring cylinder 4. By observing the change in the amount of water inside the measuring cylinder 4, the permeability characteristics of the surrounding rock after rapid unloading can be obtained, thereby solving the problem of water seepage in the surrounding rock after tunnel unloading under different stress states.

[0032] Among them, the connecting column 7 is fixedly connected to the box body 1, the compression spring 20 is fixedly connected to the arc shell 8 and the T-shaped rod 11, the two liquid channels 21 are connected to the arc shell 8, and the T-shaped rod 11 is slidably connected to the arc shell 8.

[0033] The water pressure sensor 17 is fixedly connected to the housing 1, and the air supply pipe 19 is connected to the space below the sealing cover 16.

[0034] The liquid storage chamber 141 and the sliding chamber 143 are both located inside the housing 1. The suction pipe 144 extends into the liquid storage chamber 141. The liquid pump 142 is fixedly connected to the housing 1. The left end of the front connecting pipe 145 is connected to the outlet of the liquid pump 142, and the left end of the rear connecting pipe 145 is connected to the liquid storage chamber 141. The right ends of both connecting pipes 145 are connected to the liquid channel 21 on the same side. Their function is to supply the liquid inside the liquid storage chamber 141 to the interior of the arc-shaped shell 8 through the connecting pipes 145 and the liquid channel 21 via the operation of the liquid pump 142. With the control valve 146 closed and the baffle 10 limited by multiple limiting blocks 155, as liquid is continuously supplied to the interior of the arc-shaped shell 8, the two T-shaped rods 11 move downward and compress the spring 20. The downward movement of the T-shaped rods 11 will drive the compression plate 12 and the pressure sensor 13 to move downward. The compression plate 12 will compress the surrounding rock directly below, and the pressure sensor 13 will record the magnitude of the pressure applied by the compression plate 12. When the applied pressure is the target value, the target depth of the stone is simulated, thereby conducting water seepage tests on stones of different depths.

[0035] The liquid inlet shell 151 and the two sleeves 156 are fixedly connected to the arc-shaped shell 8. When the upper control valve 152 is in the open state, the liquid inlet shell 151 is connected to the arc-shaped shell 8, and the slide rod 154 is slidably connected to the sleeve 156.

[0036] The inner sides of the two rectangular columns 6 are provided with sliding grooves that are adapted to the multi-stage telescopic plate 148. The function of these grooves is as follows: when the front lower control valve 146 is in the state where the liquid pump 142 is connected to the sliding chamber 143 and the rear lower control valve 146 is in the closed state, the liquid pump 142 works, and the liquid enters the sliding chamber 143. As the liquid enters the interior of the sliding chamber 143, the multi-stage telescopic plate 148 is in the extended state, and the top of the multi-stage telescopic plate 148 contacts the sealing cover plate 16 with good sealing performance. When the front lower control valve 146 is in the closed state and the rear lower control valve 146 is in the state where the sliding chamber 143 is connected to the liquid storage chamber 141, the multi-stage telescopic plate 148 will squeeze the liquid inside the sliding chamber 143 back into the liquid storage chamber 141 due to its own weight.

[0037] Working principle: The surrounding rock to be tested for seepage is cut to a suitable size and placed on the right side of the rectangular column 6. Then, the lower control valve 146 on the front side is in the state of connecting the liquid pump 142 with the liquid channel 21. The liquid pump 142 works, supplying the liquid inside the storage chamber 141 to the inside of the arc-shaped shell 8 through the connecting pipe 145 and the liquid channel 21. Since the lower control valve 146 on the rear side is in the closed state, and the partition 10 is limited by multiple limiting inclined blocks 155, as the liquid is continuously supplied to the inside of the arc-shaped shell 8, the two T-shaped rods 11 will move downward and squeeze the compression spring 20. The downward movement of the T-shaped rods 11 will drive the compression plate 12 and the pressure sensor 13 to move downward. The compression plate 12 will squeeze the surrounding rock directly below. Simultaneously, pressure sensor 13 records the magnitude of the pressure applied by extrusion plate 12. When the applied pressure reaches the target value, simulating a stone at the target depth, liquid pump 142 stops working, and the lower control valve 146 on the front side is closed. The sealing cover 16 is opened, and the multi-stage telescopic plate 148 is extended, injecting an appropriate amount of water into the left space of the multi-stage telescopic plate 148. Then, the sealing cover 16 is closed, and air pump 18 operates, supplying gas to the upper space of the water. When water pressure sensor 17 detects that the water pressure reaches the target value, simulating water pressure at different depths, air pump 18 stops supplying gas. Subsequently, the lower control valve 146 on the rear side is in a state that connects the sliding chamber 143 to the liquid storage chamber 141. At this time, the multi-stage telescopic plate... Due to its own weight, plate 148 will press down to squeeze the liquid inside sliding cavity 143 back into the liquid storage cavity 141. Under the action of limiting block 147, the top of multi-stage telescopic plate 148 will be flush with the lower surface of rectangular column 6. At this time, water will come into contact with the surrounding rock on the right and begin to slowly seep in, thus starting the seepage test. During the process, air pump 18 will pump gas into the space above the liquid surface, so that the water pressure detected by water pressure sensor 17 is always at the preset value. The water seeping from the surrounding rock will flow into the water collection tank 2, be filtered by filter plate 3, and be collected in the measuring cylinder 4. Based on the seepage time and seepage volume, the permeability characteristics of the surrounding rock can be obtained. During the seepage test of the surrounding rock under rapid unloading, the liquid level of the water on the left side of multi-stage telescopic plate 148... When the position is lower than the height of the surrounding rock, multiple upper control valves 152 will open, and the liquid inside the arc-shaped shell 8 will enter the interior of the liquid inlet shell 151. Since the push rod 153 is slidably connected to the liquid inlet shell 151, as the liquid continuously enters the interior of the liquid inlet shell 151, the push rod 153 will slide outward. The push rod 153 will drive the slide rod 154 to slide outward, thereby driving the limiting inclined block 155 to slide outward and squeeze the reset spring 157. Subsequently, the limiting inclined block 155 will no longer limit the partition 10, and the compression spring 20 will push the T-shaped rod 11 to move upward, thereby pushing the liquid to move the partition 10 upward, thus completing the rapid unloading. Observe the amount of water inside the measuring cylinder 4 to obtain the permeability characteristics of the surrounding rock after rapid unloading.After unloading, the liquid inside the arc-shaped shell 8 flows back into the liquid storage chamber 141, and the partition 10, due to its own weight, passes through the limiting wedge 155, thus completing its reset. It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A tunnel excavation surrounding rock water permeation test device, comprising a box body (1), a water collecting groove (2) is opened in the bottom of the box body (1), characterized in that, The middle part of the water collecting tank (2) is fixedly connected with a filter plate (3), the bottom of the water collecting tank (2) is clamped with a measuring cylinder (4), the right side of the box (1) is provided with a cylinder taking port (5), and the inside of the box (1) is fixedly connected with two rectangular columns (6). Two connecting columns (7) are provided, the inside of the connecting column (7) is provided with a liquid channel (21), two connecting columns (7) are fixedly connected with an arc-shaped shell (8), two liquid channels (21) are in communication with the arc-shaped shell (8), the inside of the arc-shaped shell (8) is fixedly installed with a rectangular ring (9), the upper side of the rectangular ring (9) is provided with a partition plate (10), the bottom of the arc-shaped shell (8) is slidably connected with two T-shaped rods (11), the bottom of the two T-shaped rods (11) is fixedly connected with an extrusion plate (12), the lower surface of the extrusion plate (12) is fixedly installed with a pressure sensor (13), and the arc-shaped shell (8) and the T-shaped rod (11) are provided with a compression spring (20). A feeding mechanism (14) is arranged at the bottom of the box (1); Two telescopic mechanisms (15) are arranged on the left and right sides of the arc-shaped shell (8). The feeding mechanism (14) comprises a liquid storage cavity (141), a liquid pump (142), and a sliding cavity (143), the rear part of the liquid pump (142) is fixedly connected with a liquid suction pipe (144), the front and rear parts of the sliding cavity (143) are in communication with connecting pipes (145), the middle part of the connecting pipe (145) is fixedly connected with a lower control valve (146), the inside of the sliding cavity (143) is fixedly connected with a limiting block (147), and the top of the sliding cavity (143) is slidably connected with a multi-stage telescopic plate (148).

2. The tunnel excavation surrounding rock water permeation test device according to claim 1, characterized in that, The upper surface of the box (1) is movably installed with a sealing cover plate (16), the lower side of the sealing cover plate (16) is provided with a water pressure sensor (17), the left side of the box (1) is fixedly installed with an air pump (18), and the upper side of the air pump (18) is in communication with a gas supply pipe (19).

3. The tunnel excavation surrounding rock water permeation test device according to claim 2, characterized in that, The telescopic mechanism (15) comprises an inlet shell (151) and two cylinder sleeves (156), the inner side of the inlet shell (151) is provided with an upper control valve (152), the outer side of the inlet shell (151) is slidably connected with a push rod (153), the front and rear ends of the push rod (153) are fixedly connected with sliding rods (154), the inner end of the sliding rod (154) is fixedly connected with a limiting inclined block (155), and the cylinder sleeve (156) and the limiting inclined block (155) are provided with a reset spring (157).

4. The tunnel excavation surrounding rock water permeation test device according to claim 3, characterized in that, The connecting column (7) is fixedly connected with the box (1), the compression spring (20) is fixedly connected with the arc-shaped shell (8) and the T-shaped rod (11), and the T-shaped rod (11) is slidably connected with the arc-shaped shell (8).

5. The tunnel excavation surrounding rock water permeation test device according to claim 4, characterized in that, The water pressure sensor (17) is fixedly connected with the box (1), and the gas supply pipe (19) is in communication with the space below the sealing cover plate (16).

6. The tunnel excavation surrounding rock water permeation test device according to claim 5, characterized in that, The liquid storage cavity (141) and the sliding cavity (143) are arranged in the interior of the box (1), the liquid suction tube (144) is arranged in the interior of the liquid storage cavity (141), the liquid pump (142) is fixedly connected with the box (1), the left end of the front connecting pipe (145) is communicated with the liquid outlet of the liquid pump (142), the left end of the rear connecting pipe (145) is communicated with the liquid storage cavity (141), and the right ends of the two connecting pipes (145) are communicated with the liquid channels (21) on the same side.

7. The tunnel excavation surrounding rock water permeation test device according to claim 6, characterized by The liquid inlet shell (151) and the two sleeve sleeves (156) are fixedly connected with the arc-shaped shell (8), the liquid inlet shell (151) is communicated with the arc-shaped shell (8) when the upper control valve (152) is in the open state, and the sliding rod (154) is slidably connected with the sleeve sleeve (156).

8. The tunnel excavation surrounding rock water permeation test device according to claim 7, characterized in that, The inner sides of the two rectangular columns (6) are provided with sliding grooves matched with the multi-stage telescopic plates (148).

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