Adjustable rock mass fracture permeability testing device and testing method

Abstract

The application belongs to the technical field of rock mass crack permeability testing, and discloses an adjustable rock mass crack permeability testing device, which comprises a testing box, bolts, a rock mass sample and an elastic assembly. A gland is press-fitted on the top of the testing box through the bolts. The bottom of the gland is glued with a press-fitting plate. The inside of the testing box is fixedly installed with a supporting plate. The top of the supporting plate is glued with a buffer pad. The device adopts a brand-new testing method. The press-fitting plate and the supporting plate arranged above and below provide vertical sealing for the rock mass sample. The water permeated through the rock mass sample rapidly fills the space between the supporting plate and the sealing plate, and the resulting permeated water pressure pushes the reading plate and the reading scale downward. The reading scale is aligned with the scale, and the permeated water pressure value is obtained, thereby completing the crack permeability testing of the rock mass sample. The device realizes good sealing performance by pre-processing the rock mass sample and cooperating with the sealing block.

Description

Technical Field

[0001] This invention belongs to the field of rock mass fracture permeability testing technology, specifically an adjustable rock mass fracture permeability testing device and testing method. Background Technology

[0002] The rock mass fissure permeability coefficient is an important parameter reflecting the permeability of fractured rock masses, and it has a significant impact on the stability of dams, slopes, and underground caverns. Due to geological reasons and the continuous erosion of rock masses by groundwater with a certain pressure, some rock masses have been permeated and developed cracks. Water seeps into the cracks and generates a certain pressure, which is called permeation pressure. In order to avoid the influence of rock mass cracks during underground engineering excavation, it is necessary to test the rock mass. At present, the most common method is to use drill rods to drill into the rock mass in a designated area, add water, and apply high pressure feedback. However, this method is limited by the construction site conditions and cannot achieve a sufficient sealing effect, which will cause the pressure gauge reflecting the permeation pressure of the rock mass to not display a reading or to read an inaccurate reading. Therefore, this invention is dedicated to designing a sample-type testing device for experiments. Summary of the Invention

[0003] The purpose of this invention is to provide an adjustable rock mass fracture permeability testing device and method to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an adjustable rock mass fracture permeability testing device, comprising a test chamber, bolts, a rock mass sample, and an elastic component. A pressure cap is bolted to the top of the test chamber, and a pressure plate is glued to the bottom of the pressure cap. A support plate is fixedly installed inside the test chamber, and a buffer pad is glued to the top of the support plate. A limit ring is fixedly connected to the top of the buffer pad, and a rock mass sample is placed inside the limit ring. A water inlet pipe is fixedly installed inside the pressure cap, and sealing blocks are fixedly fitted at both ends of the outer surface of the water inlet pipe. A guide plate is fixedly connected to the inner side of the sealing block via a connecting piece. A water outlet hole is formed on the outer surface of the water inlet pipe. A sealing plate is fixedly connected to the top of the elastic component, and a sealing ring is fixedly fitted to the outer surface of the sealing plate. A reading plate is fixedly connected to the bottom of the sealing plate, and a scale is formed on the outer surface of the test chamber.

[0005] Preferably, the elastic component includes a receiving column, a spring, and a telescopic column. The receiving column is movably fitted with the spring and the telescopic column. The telescopic column is elastically supported inside the receiving column by the spring. The top end of the telescopic column is fixedly connected to the sealing plate.

[0006] Preferably, a slot is provided at the bottom of the inner wall of the test chamber, and a reading ruler is fixedly connected to the outer side of the reading plate, the reading ruler being adapted to be snapped into the inside of the slot.

[0007] Preferably, the limiting ring is made of rubber block, and an airbag is fixedly connected to the left side of the outer surface of the limiting ring through a connecting tube. The airbag is a hollow ring shape and fills the space between the limiting ring and the buffer pad.

[0008] Preferably, the buffer pad is made of rubber block, the support plate and the buffer pad have the same horizontal cross-sectional shape and size, and the support plate and the buffer pad are provided with through-holes in the middle. An adapter post is fixedly connected to the bottom of the sealing block on the lower side, and the adapter post is adapted to fit through the interior of the adapter hole.

[0009] Preferably, both the sealing block and the limiting ring are made of rubber blocks. The outer surface of the rock mass sample is in contact with the limiting ring by compression. An inner groove is provided inside the rock mass sample, and the upper and lower sealing blocks are in contact with the upper and lower sides of the inner wall of the inner groove by compression in sequence.

[0010] Preferably, there are sixteen water outlet holes, which are divided into four groups and distributed at equal intervals along the axis of the water inlet pipe. Each group of water outlet holes is opened at equal angles on the outer surface of the water inlet pipe. The horizontal cross-sectional shape of the guide plate is arc-shaped, and the water outlet holes face the convex surface of the guide plate.

[0011] Preferably, there are two connecting pieces, which are fixedly connected to the opposite surfaces of the two sealing blocks, and the upper and lower ends of the guide plate are fixedly connected to the upper and lower connecting pieces respectively.

[0012] A testing method for an adjustable rock mass fracture permeability testing device includes the following steps:

[0013] S1: Take a rock mass sample and open and grind an inner groove in the middle of it. Open the pressure cap and move the water inlet pipe, sealing block, connecting piece, and guide plate upward to release the opening restriction at the top of the test box. Put the rock mass sample into the interior of the test box and fix the pressure cap and water inlet pipe to the initial installation position.

[0014] S2: The sealing block drives the adapter column to move downward and penetrates the inside of the support plate and buffer pad. The sealing block is pressed against the inner wall of the inner groove and produces a sealing effect.

[0015] S3: High-pressure water is introduced through the inlet pipe and sprayed out through the outlet hole. It contacts and collides with the guide plate, and the water flow is dispersed to reduce the excessive erosion of the rock sample. The high-pressure water flow quickly fills the cracks inside the rock sample and enters the airbag through the connecting pipe, filling the space between the support plate and the sealing plate.

[0016] S4: The sealing plate moves vertically downward under the water pressure from above, which drives the telescopic column to move down and compress the spring, causing the reading plate and reading scale to move down, so that the reading scale is relative to a certain value of the scale, thus obtaining the permeable water pressure of the rock mass sample, and then obtaining the fracture permeability of the rock mass sample.

[0017] S5: High-pressure water flows into the airbag and inflates it, causing the inflated airbag to exert pressure on the inner limiting ring, generating uniform and continuous pressure on the rock sample from the outside in, simulating a real geological scene.

[0018] S6: The inflated air bladder fills the space between the test chamber and the limiting ring, maintaining the fracture permeability of the rock sample when it encounters high-pressure water flow impact and seepage.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. This device employs a novel testing method. A rock sample is taken, and an inner groove is created and ground in its center. The rock sample is then enclosed by a test chamber, support plate, buffer pad, and limiting ring. A high-pressure water flow is connected to an inlet pipe to provide the testing conditions. A sealing block is formed by pressing against the upper and lower sides of the inner wall of the inner groove, allowing the high-pressure water jet from the outlet to directly penetrate into the internal cracks of the rock sample. The upper and lower pressure plates and support plate provide a vertical seal for the rock sample. The water that seeps through the rock sample quickly fills the space between the support plate and the sealing plate. The resulting seepage water pressure pushes the reading plate and reading scale downwards. By aligning the reading scale with the scale, the seepage water pressure value is obtained, thus completing the test of the crack permeability performance of the rock sample. This device achieves excellent sealing performance through pre-processing of the rock sample and the use of sealing blocks.

[0021] 2. Simultaneously, by setting up a limiting ring connection, connecting pipe, and airbag, the water that has permeated through the rock mass sample enters the airbag through the connecting pipe and quickly fills the airbag. The high-pressure water flow enters the airbag and inflates it, causing the inflated airbag to exert pressure on the limiting ring located on the inside, generating uniform and continuous pressure on the rock mass sample from the outside in, simulating a real geological scenario. On the one hand, the inflated airbag fills the space between the test chamber and the limiting ring, maintaining the crack permeability of the rock mass sample when it encounters high-pressure water flow impact and permeation. On the other hand, it also ensures that the rock mass sample is minimized from possible destructive loss during testing.

[0022] 3. Finally, when the high-pressure water flow from the inlet pipe is ejected through the outlet hole, it is fixedly connected to the guide plate and the upper and lower connecting plates. This causes the high-pressure water flow ejected from the outlet hole to collide with the guide plate. This structure can prevent the high-pressure water flow from directly impacting and damaging the rock sample. At the same time, due to the arc-shaped design of the guide plate, it will deform rapidly when it is impacted by the high-pressure water flow, and then apply pressure to the connecting plates and sealing blocks, thereby maintaining the sealing stability of the sealing blocks. Attached Figure Description

[0023] Figure 1 This is a front view diagram of the overall structure of the present invention;

[0024] Figure 2 This is a front sectional view of the overall structure of the present invention;

[0025] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A;

[0026] Figure 4 For the present invention Figure 2 Enlarged schematic diagram of the structure at point B;

[0027] Figure 5 This is a schematic diagram showing the separation of the sealing plate, sealing ring, elastic component, reading plate, and reading ruler of the present invention.

[0028] Figure 6 This is a schematic diagram showing the separation of the pressure cap, bolts, water inlet pipe, rock mass sample, support plate, buffer pad, limiting ring, connecting pipe and airbag of the present invention;

[0029] Figure 7 This is a schematic diagram showing the separation of the water inlet pipe, water outlet, sealing block, connecting piece, guide plate and adapter column of the present invention;

[0030] Figure 8 This is a cross-sectional schematic diagram of the structure of the present invention;

[0031] Figure 9 This is a top view of a partial structure of the present invention.

[0032] In the diagram: 1. Test box; 2. Scale; 3. Cover; 31. Press plate; 4. Bolt; 5. Water inlet pipe; 6. Water outlet; 7. Sealing block; 8. Connecting piece; 9. Guide plate; 10. Rock mass sample; 11. Inner groove; 12. Adaptor column; 13. Support plate; 14. Buffer pad; 15. Limiting ring; 16. Connecting pipe; 17. Airbag; 18. Sealing plate; 19. Sealing ring; 20. Elastic component; 201. Receiving column; 202. Spring; 203. Telescopic column; 21. Reading plate; 22. Reading scale; 23. Adaptor hole; 24. Slot. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figures 1 to 9 As shown, this embodiment of the invention provides an adjustable rock mass fracture permeability testing device, including a test box 1, bolts 4, a rock mass sample 10, and an elastic component 20. A pressure cover 3 is installed on the top of the test box 1 by bolts 4, and a pressure plate 31 is glued to the bottom of the pressure cover 3. A support plate 13 is fixedly installed inside the test box 1, and a buffer pad 14 is glued to the top of the support plate 13. A limit ring 15 is fixedly connected to the top of the buffer pad 14, and the rock mass sample 10 is placed inside the limit ring 15. A water inlet pipe 5 is fixedly installed inside the pressure cover 3. Sealing blocks 7 are fixedly sleeved at both ends of the outer surface of the water inlet pipe 5. A guide plate 9 is fixedly connected to the inner side of the sealing block 7 by a connecting piece 8. A water outlet hole 6 is opened on the outer surface of the water inlet pipe 5. A sealing plate 18 is fixedly connected to the top of the elastic component 20, and a sealing ring 19 is fixedly sleeved on the outer surface of the sealing plate 18. A reading plate 21 is fixedly connected to the bottom of the sealing plate 18. A scale 2 is opened on the outer surface of the test box 1.

[0035] This device employs a novel testing method. A rock sample 10 is taken, and an inner groove 11 is opened and ground in its center. The rock sample 10 is enclosed by a test box 1, a support plate 13, a buffer pad 14, and a limiting ring 15. A high-pressure water flow is connected to an inlet pipe 5 to provide testing conditions. A sealing condition is formed by the upper and lower sides of the inner wall of the inner groove 11 through the sealing block 7. This allows the high-pressure water flow sprayed from the outlet hole 6 of the inlet pipe 5 to directly penetrate into the internal cracks of the rock sample 10. The upper and lower pressure plates 31 and the support plate 13 provide a vertical seal for the rock sample 10. The water that seeps out of the rock sample 10 quickly fills the space between the support plate 13 and the sealing plate 18. The resulting seepage water pressure pushes the reading plate 21 and the reading scale 22 downwards. By aligning the reading scale 22 with the scale 2, the seepage water pressure value is obtained, thus completing the test of the crack permeability performance of the rock sample 10. This device achieves good sealing performance by pre-processing the rock sample 10 and using the sealing block 7.

[0036] Meanwhile, by setting up a limiting ring 15, a connecting pipe 16, and an air bladder 17, the water that has permeated through the rock sample 10 enters the air bladder 17 along the connecting pipe 16 and quickly fills the air bladder 17. The high-pressure water flow enters the air bladder 17 and inflates it, causing the inflated air bladder 17 to exert pressure on the limiting ring 15 located on the inner side, generating a uniform and continuous pressure on the rock sample 10 from the outside to the inside, simulating a real geological scene. On the one hand, the inflated air bladder 17 fills the space between the test chamber 1 and the limiting ring 15, maintaining the crack permeability of the rock sample 10 when it encounters the impact of high-pressure water flow. On the other hand, it also ensures that the rock sample 10 is tested with minimal potential destructive damage.

[0037] Finally, when the high-pressure water flow from the inlet pipe 5 is ejected through the outlet hole 6, it is fixedly connected to the upper and lower connecting plates 8 by the guide plate 9, so that the high-pressure water flow ejected from the outlet hole 6 impacts the guide plate 9. This structure can prevent the high-pressure water flow from directly impacting and damaging the rock sample 10. At the same time, due to the arc-shaped design of the guide plate 9, it will deform rapidly when it is impacted by the high-pressure water flow, and then apply pressure to the connecting plate 8 and the sealing block 7, thereby maintaining the sealing stability of the sealing block 7.

[0038] The elastic component 20 includes a receiving column 201, a spring 202, and a telescopic column 203. The receiving column 201 is movably sleeved with the spring 202 and the telescopic column 203. The telescopic column 203 is elastically supported inside the receiving column 201 by the spring 202. The top end of the telescopic column 203 is fixedly connected to the sealing plate 18.

[0039] The elastic component 20 is responsible for generating linear rebound pressure. Under the action of the permeation water pressure, the sealing plate 18 and sealing ring 19 move downward, pushing the reading plate 21, reading scale 22 and telescopic column 203 downward, and continuously compressing the spring 202, so as to realize the visual adjustment of the permeation water pressure. The reading scale 22 moves down along the inside of the slot 24 and stops at a certain scale on the scale 2, so as to obtain the reading of the permeation water pressure.

[0040] Among them, the bottom of the inner wall of the test box 1 is provided with a slot 24, and the outer side of the reading plate 21 is fixedly connected with a reading ruler 22, which is adapted to be snapped into the inside of the slot 24.

[0041] The slots 24 are located on both sides of the scale 2, providing a stable vertical movement channel and space for the vertical movement of the reading scale 22. The reading scale 22 is fixedly connected to the reading plate 21 and is used to display the permeable water pressure reading of the rock sample 10.

[0042] Among them, the limiting ring 15 is made of rubber block, and the left side of the outer surface of the limiting ring 15 is fixedly connected to the airbag 17 through the connecting pipe 16. The airbag 17 is a hollow ring shape that fills the space between the limiting ring 15 and the buffer pad 14.

[0043] The limiting ring 15 is made of rubber block and is responsible for wrapping the rock sample 10 from the outside when the rock sample 10 is placed into the inner cavity of the test box 1, maintaining the stability of the rock sample 10. Under the action of the seepage water pressure of the rock sample 10, the air bladder 17 wrapped outside applies pressure inward to maintain the constraint force on the outside of the rock sample 10.

[0044] Among them, the buffer pad 14 is made of rubber block, the support plate 13 and the buffer pad 14 have the same horizontal cross-sectional shape and size, and the support plate 13 and the buffer pad 14 are both provided with through-type adapter holes 23 in the middle. The bottom of the lower sealing block 7 is fixedly connected to the adapter post 12, and the adapter post 12 is adapted to fit through the interior of the adapter hole 23.

[0045] The buffer pad 14 provides upward cushioning for the rock sample 10, avoiding direct rigid contact between the rock sample 10 and the support plate 13, reducing the impact on the rock sample 10 and reducing environmental variables during the experiment. When the water inlet pipe 5 is installed into the test chamber 1, it is inserted and engaged by the adapter column 12 into the support plate 13 and the buffer pad 14, improving the installation stability of the water inlet pipe 5.

[0046] Among them, the sealing block 7 and the limiting ring 15 are both made of rubber blocks. The outer side of the rock sample 10 is in contact with the limiting ring 15. The rock sample 10 has an inner groove 11 inside. The upper and lower sealing blocks 7 are in contact with the upper and lower sides of the inner wall of the inner groove 11 in turn.

[0047] like Figure 7 As shown, the sealing block 7 is made of rubber block, which is squeezed into contact with the inside of the inner groove 11 to form a sealing condition, so that the high pressure water flow connected to the water inlet pipe 5 can penetrate into the interior of the rock sample 10. The limiting ring 15 provides corresponding constraint and protection functions for the rock sample 10.

[0048] There are sixteen water outlet holes 6. The sixteen water outlet holes 6 are divided into four groups and are distributed at equal intervals along the axis of the water inlet pipe 5. Each group of water outlet holes 6 is opened at equal angles on the outer surface of the water inlet pipe 5. The horizontal cross-sectional shape of the guide plate 9 is arc-shaped. The water outlet holes 6 and the convex surface of the guide plate 9 are facing each other.

[0049] The water outlet 6 connects the inside and outside of the water inlet pipe 5. The high-pressure water flow that enters the inner cavity of the test chamber 1 along the water inlet pipe 5 is sprayed out through the water outlet 6. The guide plate 9 is responsible for facing the water outlet 6 directly to prevent the high-pressure water flow sprayed out along the water outlet 6 from directly impacting the rock sample 10, thus providing an indirect buffering function for the rock sample 10.

[0050] There are two connecting pieces 8, which are fixedly connected to the opposite surfaces of the two sealing blocks 7 respectively. The upper and lower ends of the guide plate 9 are fixedly connected to the upper and lower connecting pieces 8 respectively.

[0051] The connecting piece 8 is glued to the sealing block 7. Its outer diameter is smaller than that of the sealing block 7, which can maintain the local rigidity of the sealing block 7 and increase the sealing pressure of the sealing block 7.

[0052] A testing method for an adjustable rock mass fracture permeability testing device includes the following steps:

[0053] S1: Take a rock sample 10 and open and grind an inner groove 11 in its middle. Open the pressure cap 3 and move the water inlet pipe 5, sealing block 7, connecting piece 8, and guide plate 9 upward to release the opening restriction at the top of the test box 1. Place the rock sample 10 into the interior of the test box 1 and fix the pressure cap 3 and water inlet pipe 5 to the initial installation position.

[0054] S2: The sealing block 7 drives the adapter column 12 to move downward and penetrates the support plate 13 and the buffer pad 14. The sealing block 7 is pressed against the inner wall of the inner groove 11 and produces a sealing effect.

[0055] S3: High-pressure water flow is connected through the inlet pipe 5 and sprayed out through the outlet hole 6. It contacts and collides with the guide plate 9. The water flow is dispersed to reduce the excessive erosion of the rock sample 10. The high-pressure water flow quickly fills the cracks inside the rock sample 10 and enters the airbag 17 through the connecting pipe 16, filling the space between the support plate 13 and the sealing plate 18.

[0056] S4: The sealing plate 18 moves vertically downward under the water pressure from above, which causes the telescopic column 203 to move down and compress the spring 202, causing the reading plate 21 and the reading ruler 22 to move down, so that the reading ruler 22 is relative to a certain value of the scale 2, thus obtaining the permeable water pressure of the rock mass sample 10, and then obtaining the fracture permeability of the rock mass sample 10.

[0057] S5: High-pressure water flow enters the airbag 17 and inflates it, causing the inflated airbag 17 to exert pressure on the inner limiting ring 15, generating uniform and continuous pressure from the outside to the inside on the rock sample 10, simulating a real geological scene.

[0058] S6: The inflated air bladder 17 fills the space between the test chamber 1 and the limiting ring 15, maintaining the fracture permeability of the rock sample 10 when it encounters high-pressure water flow impact and seepage.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A testing method for an adjustable rock mass fracture permeability testing device, characterized in that: The adjustable rock mass fracture permeability testing device includes a test box (1), bolts (4), a rock mass sample (10), and an elastic component (20). A pressure cap (3) is installed on the top of the test box (1) by bolts (4). A pressure plate (31) is glued to the bottom of the pressure cap (3). A support plate (13) is fixedly installed inside the test box (1). A buffer pad (14) is glued to the top of the support plate (13). A limit ring (15) is fixedly connected to the top of the buffer pad (14). The rock mass sample (10) is placed inside the limit ring (15). An inner groove (11) is opened inside the rock mass sample (10). A water inlet pipe (5) is fixedly installed inside the pressure cap (3). The upper and lower ends of the outer surface of the water inlet pipe (5) are fixedly fitted with sealing blocks (7). The sealing blocks (7) are pressed against the upper and lower sides of the inner wall of the inner groove (11) to form a seal. The inner side of the sealing blocks (7) is fixedly connected to a guide plate (9) through a connecting piece (8). The outer surface of the water inlet pipe (5) is provided with a water outlet hole (6). The water outlet hole (6) is opposite to the convex surface of the guide plate (9), so that the high-pressure water flow is sprayed through the water outlet hole (6) and impacted and dispersed by the guide plate (9). The top end of the elastic component (20) is fixedly connected with a sealing plate (18). The outer surface of the sealing plate (18) is fixedly fitted with a sealing ring (19). The bottom of the sealing plate (18) is fixedly connected with a reading plate (). 21), a reading scale (22) is fixedly connected to the outer side of the reading plate (21), a scale (2) is opened on the outer surface of the test box (1), and a slot (24) is opened at the bottom of the inner wall of the test box (1). The reading scale (22) is adapted to be snapped into the inside of the slot (24); the limiting ring (15) is made of rubber block, and an air bag (17) is fixedly connected to the left side of the outer surface of the limiting ring (15) through a connecting pipe (16). The air bag (17) is a hollow ring filled between the limiting ring (15) and the buffer pad (14). The air bag (17) is filled and expanded by the water flow after the rock sample (10) permeates, and applies a uniform pressure from the outside to the inside to the limiting ring (15). To simulate confining pressure; the elastic component (20) includes a receiving column (201), a spring (202) and a telescopic column (203), the receiving column (201) is movably sleeved with the spring (202) and the telescopic column (203), the telescopic column (203) is elastically supported inside the receiving column (201) by the spring (202), and the top of the telescopic column (203) is fixedly connected to the sealing plate (18); the middle of the support plate (13) and the buffer pad (14) are both provided with through-type adapter holes (23), the bottom of the sealing block (7) is fixedly connected with an adapter column (12), and the adapter column (12) is adapted downward to fit through the interior of the adapter hole (23); the test method includes the following steps: First, take a rock sample (10) and open and grind an inner groove (11) in the middle. Open the pressure cap (3) and move the water inlet pipe (5), sealing block (7), connecting piece (8), and guide plate (9) upward to release the opening restriction at the top of the test box (1). Place the rock sample (10) into the interior of the test box (1) and fix the pressure cap (3) and water inlet pipe (5) to the initial installation position. In the second step, the sealing block (7) drives the adapter column (12) to move downward and penetrate the support plate (13) and buffer pad (14). The sealing block (7) is pressed against the inner wall of the inner groove (11) and produces a sealing effect. The third step involves connecting high-pressure water through the inlet pipe (5) and spraying the high-pressure water out through the outlet hole (6), which contacts and collides with the guide plate (9). The water flow is dispersed to reduce excessive erosion of the rock sample (10). The high-pressure water fills the cracks inside the rock sample (10) and enters the airbag (17) through the connecting pipe (16) and fills the space between the support plate (13) and the sealing plate (18). In the fourth step, the sealing plate (18) is subjected to water pressure from above and moves vertically downward, causing the telescopic column (203) to move down and compress the spring (202), which in turn causes the reading plate (21) and the reading ruler (22) to move down, so that the reading ruler (22) is relative to a certain value of the scale (2), and the permeability pressure of the rock mass sample (10) is obtained, and then the crack permeability performance of the rock mass sample (10) is obtained. In the fifth step, high-pressure water flows into the airbag (17) and inflates it, causing the inflated airbag (17) to exert pressure on the inner limiting ring (15), generating uniform and continuous pressure from the outside to the inside on the rock sample (10), simulating a real geological scene.

2. The testing method of the adjustable rock mass fracture permeability testing device according to claim 1, characterized in that: The buffer pad (14) is made of rubber blocks, and the support plate (13) and the buffer pad (14) have the same horizontal cross-sectional shape and size.

3. The testing method of the adjustable rock mass fracture permeability testing device according to claim 1, characterized in that: The sealing block (7) and the limiting ring (15) are both made of rubber blocks. The outer side of the rock sample (10) is pressed against the limiting ring (15), and the upper and lower sealing blocks (7) are pressed against the upper and lower sides of the inner wall of the inner groove (11) in turn.

4. The testing method of the adjustable rock mass fracture permeability testing device according to claim 1, characterized in that: The number of water outlet holes (6) is sixteen. The sixteen water outlet holes (6) are divided into four groups and are distributed at equal intervals along the axis of the water inlet pipe (5). Each group of water outlet holes (6) is opened at equal angles on the outer surface of the water inlet pipe (5). The horizontal cross-sectional shape of the guide plate (9) is arc-shaped.

5. The testing method of the adjustable rock mass fracture permeability testing device according to claim 1, characterized in that: The number of connecting pieces (8) is two, and the two connecting pieces (8) are respectively fixedly connected to the opposite surfaces of the two sealing blocks (7). The upper and lower ends of the guide plate (9) are respectively fixedly connected to the upper and lower connecting pieces (8).

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