Rock fracture seepage simulation experiment device

Abstract

The utility model discloses a rock fracture seepage simulation experiment device which comprises a cylinder barrel, an upper cover plate and a lower cover plate are arranged at the top and the bottom of the cylinder barrel respectively, a butt joint ring is fixed to the position, close to the bottom, of the outer side of the cylinder barrel in a sleeved mode, a deviation rectifying block is contained in the cylinder barrel, an upper rock sample is arranged at the bottom of the deviation rectifying block, and an adjusting rod is inserted into the top of the upper cover plate in a threaded mode. The bottom of the adjusting rod extends into the cylinder barrel and is rotationally connected to the top of the deviation rectifying block. A lower rock sample right opposite to the upper rock sample is arranged at the bottom of the inner side of the cylinder barrel, and a crack is reserved between the bottom of the upper rock sample and the top of the lower rock sample. A water inlet pipe joint is inserted and fixed at the bottom of the lower cover plate; through holes through which the water inlet pipe joint sequentially penetrates are formed in the bottom of the cylinder barrel and a rock body of the lower rock sample. The butt joint ring and the lower cover plate are mutually sealed and fixed through the locking assembly, through the locking assembly arranged between the bottom of the cylinder barrel and the lower cover plate, rapid disassembly and assembly between the bottom of the cylinder barrel and the lower cover plate are conveniently and efficiently achieved, the sealing performance after installation can be ensured, and the disassembly and assembly efficiency is high.

Description

Technical Field

[0001] This utility model relates to an experimental device, and more particularly to an experimental device for simulating seepage in rock fissures. Background Technology

[0002] Chinese utility model patent CN2874496Y discloses a rock radial fracture seepage test device with adjustable gap, including an MTS815 or 816 series rock mechanics test system, a cylinder and a cover plate on it, a correction block inside the cylinder, a base plate at the bottom, an adjusting screw connected to the cover plate on the correction block, a gap between the correction block and the base plate for seepage of rock sample, a water passage hole for the lower sample on the base plate and a connector connected to the water inlet pipe, and a drain hole on the cylinder with a drain pipe connector. Under water pressure, the relative position of the joint surfaces can be automatically adjusted to achieve ideal parallelism; the parallelism of the fracture surfaces can be automatically adjusted, and the distance can be manually adjusted. It is suitable for testing rock mechanical properties, has a simple structure, reliable sealing, is easy to use, and has good results, making it widely applicable.

[0003] The aforementioned patented technology has certain defects, specifically:

[0004] The bottom of the cylinder and the top of the base plate in this patent are sealed and fixed by O-rings and bolts to improve the sealing performance of the cylinder bottom. However, this sealing and fixing method requires the sequential disassembly and assembly of multiple bolts, resulting in low disassembly and assembly efficiency and is very inconvenient. Utility Model Content

[0005] To address the technical problems mentioned in the background section, this invention provides a rock fracture seepage simulation experimental device.

[0006] This utility model is achieved using the following technical solution: a rock fracture seepage simulation experimental device, characterized in that it includes a cylinder, with an upper cover plate and a lower cover plate respectively provided at the top and bottom of the cylinder, and a connecting ring is sleeved and fixed on the outer side of the cylinder near the bottom.

[0007] The cylinder contains a correction block, the bottom of which is provided with an upper rock sample. An adjusting rod is threaded into the top of the upper cover plate, the bottom of which extends into the cylinder and is rotatably connected to the top of the correction block.

[0008] The bottom of the inner side of the cylinder is provided with a lower rock sample that is directly opposite the position of the upper rock sample, and a gap is left between the bottom of the upper rock sample and the top of the lower rock sample;

[0009] A water inlet pipe connector is inserted and fixed at the bottom of the lower cover plate, and through holes are opened on the bottom of the cylinder and the rock mass of the lower rock sample for the water inlet pipe connector to pass through in sequence.

[0010] The outer side of the correction block has an annular cylindrical space, and a drain pipe connector that communicates with the annular cylindrical space is inserted and fixed into the outer wall of the cylinder.

[0011] The docking ring and the lower cover plate are sealed and fixed to each other by a locking assembly.

[0012] As a further improvement to the above solution, a receiving groove is provided at the bottom of the inner side of the cylinder and at the bottom of the correction block. The upper rock sample is bonded and fixed in the receiving groove at the bottom of the correction block, and the lower rock sample is bonded and fixed in the receiving groove at the bottom of the inner side of the cylinder.

[0013] As a further improvement to the above solution, the locking assembly includes two insert rods that are fixed relative to each other on the top of the lower cover plate, and the bottom of the cylinder has an insertion hole that engages with the insert rods.

[0014] As a further improvement to the above solution, two centripetally curved first limiting grooves are formed on the annular surface of the docking ring. A rotating ring is rotatably sleeved on the outer side of the cylinder. Two radially extending second limiting grooves are formed on the annular surface of the rotating ring. Limiting rods are slidably engaged in both of the first limiting grooves. The top of the limiting rod is slidably engaged in the corresponding second limiting groove. A centripetally radially extending locking rod is vertically fixed on the outer wall of the limiting rod. A first locking hole is formed on the outer wall of the cylinder to engage with the locking rod.

[0015] As a further improvement to the above solution, a second locking hole is provided on the outer wall of the insertion rod to engage with the locking rod.

[0016] As a further improvement to the above solution, the cylinder wall has a radially formed groove for the insertion of a locking rod, and a piston that presses against the locking rod is disposed in the groove. The cylinder wall also has an axially formed flow channel communicating with the groove. An annular groove communicating with the flow channel is formed at the bottom of the cylinder. A bladder completely covering the opening of the annular groove is provided. Hydraulic oil is contained in the groove, flow channel, and annular groove. An annular locking groove is formed at the top of the lower cover plate.

[0017] When the lever presses against the piston, it squeezes the hydraulic oil in the flow channel, forcing the bladder to expand and deform to seal and engage with the slot.

[0018] As a further improvement to the above solution, a rotating rod parallel to the cylinder axis is rotatably inserted into the top of the docking ring, a gear is fixedly sleeved on the outside of the rotating rod, and a gear ring that cooperates with the gear is fixedly sleeved on the outside of the rotating ring.

[0019] As a further improvement to the above solution, a disc is fixed to the top of the rotating rod, a locking rod is axially inserted on the disc, and a locking hole is opened on the top of the docking ring to engage with the locking rod.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] The rock fissure seepage simulation experimental device of this utility model can quickly and efficiently disassemble and assemble the bottom of the cylinder and the lower cover plate by means of a locking component set between the bottom of the cylinder and the lower cover plate, and can ensure the sealing performance after installation, with high disassembly and assembly efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 for Figure 1 A schematic diagram of the overall cross-sectional structure of the middle section;

[0024] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0025] Figure 4 for Figure 2 Enlarged structural diagram at point B.

[0026] Explanation of key symbols:

[0027] 1. Cylinder; 2. Upper cover plate; 3. Connecting ring; 4. Lower cover plate; 5. Adjusting rod; 6. Correcting block; 7. Annular cylindrical space; 9. Upper rock sample; 11. Lower rock sample; 12. Water inlet pipe connector; 13. Drain pipe connector; 14. First limiting groove; 15. Rotating ring; 16. Second limiting groove; 17. Limiting rod; 18. Locking rod; 19. First locking hole; 20. Inserting rod; 21. Inserting hole; 22. Second locking hole; 23. Flow channel; 24. Plug groove; 25. Piston; 26. Blade; 27. Locking groove; 28. Rotating rod; 29. ​​Gear; 30. Gear ring; 31. Disc; 32. Locking rod; 33. Locking hole; 34. Annular groove. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] Please combine Figures 1 to 4 A rock fissure seepage simulation experimental device includes a cylinder 1, with an upper cover plate 2 and a lower cover plate 4 respectively installed at the top and bottom of the cylinder 1. A connecting ring 3 is fitted and fixed on the outer side of the cylinder 1 near the bottom.

[0030] The cylinder 1 contains a correction block 6, and the bottom of the correction block 6 is provided with an upper rock sample 9. The top of the upper cover plate 2 is threaded with an adjusting rod 5, the bottom of the adjusting rod 5 extends into the cylinder 1 and is rotatably connected to the top of the correction block 6.

[0031] A lower rock sample 11 is provided at the bottom of the inner side of the cylinder 1, which is directly opposite the position of the upper rock sample 9. A gap is left between the bottom of the upper rock sample 9 and the top of the lower rock sample 11.

[0032] The bottom of the lower cover plate 4 is fitted with a water inlet pipe connector 12. The bottom of the cylinder barrel 1 and the rock mass of the lower rock sample 11 are both provided with through holes for the water inlet pipe connector 12 to pass through in sequence.

[0033] The outer side of the correction block 6 has an annular cylindrical space 7, and a drain pipe connector 13 that connects to the annular cylindrical space 7 is inserted and fixed on the outer wall of the cylinder 1.

[0034] The docking ring 3 and the lower cover plate 4 are sealed and fixed to each other by a locking assembly.

[0035] The bottom of the inner side of the cylinder 1 and the bottom of the correction block 6 are both provided with receiving grooves. The upper rock sample 9 is bonded and fixed in the receiving groove at the bottom of the correction block 6, and the lower rock sample 11 is bonded and fixed in the receiving groove at the bottom of the inner side of the cylinder 1.

[0036] The locking assembly includes two insert rods 20 that are fixed to the top of the lower cover plate 4, and the bottom of the cylinder 1 has an insertion hole 21 that engages with the insert rods 20.

[0037] Two centripetally curved first limiting grooves 14 are opened opposite each other on the annular surface of the docking ring 3. A rotating ring 15 is rotatably sleeved on the outer side of the cylinder 1. Two radially extended second limiting grooves 16 are opened opposite each other on the annular surface of the rotating ring 15. A limiting rod 17 is slidably engaged in both of the first limiting grooves 14. The top of the limiting rod 17 is slidably engaged in the corresponding second limiting groove 16. A centripetally extended locking rod 18 is vertically fixed on the outer wall of the limiting rod 17. A first locking hole 19 is opened on the outer wall of the cylinder 1 to engage with the locking rod 18.

[0038] The outer wall of the insertion rod 20 is provided with a second locking hole 22 that engages with the locking rod 18.

[0039] The cylinder wall of cylinder 1 has a radially formed groove 24 for the insertion of a locking rod 18. A piston 25, which presses against the locking rod 18, is installed in the groove 24. The cylinder wall of cylinder 1 has an axially formed flow channel 23 that connects to the groove 24. The bottom of cylinder 1 has an annular groove 34 that connects to the flow channel 23. A bladder 26 that completely covers the opening of the annular groove 34 is provided. Hydraulic oil is contained in the groove 24, the flow channel 23, and the annular groove 34. The top of the lower cover plate 4 has an annular locking groove 27.

[0040] When the lever 18 presses against the piston 25, it squeezes the hydraulic oil in the flow channel 23, forcing the bladder 26 to expand and deform to seal and engage with the slot 27.

[0041] The top of the docking ring 3 is rotatably inserted with a rotating rod 28 parallel to the axis of the cylinder 1. A gear 29 is sleeved and fixed on the outside of the rotating rod 28. A toothed ring 30 that cooperates with the gear 29 is sleeved and fixed on the outside of the rotating ring 15.

[0042] A disc 31 is fixed to the top of the rotating rod 28. A locking rod 32 is axially inserted on the disc 31. A locking hole 33 is opened on the top of the docking ring 3 to engage with the locking rod 32.

[0043] The working principle of this embodiment:

[0044] During assembly, the bottom of the docking ring 3 is placed on the top of the lower cover plate 4, so that the insertion rod 20 is inserted into the insertion hole 21. Then, the rotating ring 15 is rotated to rub and squeeze the limiting rod 17 through the groove wall of the second limiting groove 16. Under the combined limiting action of the first limiting groove 14, the limiting rod 17 drives the locking rod 18 to move radially to be inserted into the first locking hole 19 of the cylinder 1, the second locking hole 22 of the insertion rod 20 and the plug groove 24 in sequence. The piston 25 is pressed in the plug groove 24, so that the piston 25 squeezes the hydraulic oil in the flow channel 23, thereby causing the bladder 26 at the groove opening of the annular groove 34 to expand and deform and be inserted into the locking groove 27 of the lower cover plate 4, so as to achieve a sealed and fixed connection between the cylinder 1 and the lower cover plate 4.

[0045] During the simulation experiment, two circular rock samples, upper sample 9 and lower sample 11, were cut from the fracture (joint) surface of the rock. A through hole was drilled in the center of the lower sample 11. The lower sample 11 was bonded to the receiving groove at the bottom of the inner side of the cylinder 1 with sealant, and the upper sample 9 was bonded to the receiving groove at the bottom of the correction block 6 with sealant. During bonding, it was ensured that the joint surface of the rock sample was perpendicular to the bottom wall of the cylinder and the axis of the correction block 6, respectively. Then, the correction block 6 and the upper sample 9 were placed into the cylinder 1, and the upper cover plate 2 was installed on the top of the cylinder 1. The distance between the rock samples could be precisely adjusted by rotating the adjusting rod 5 with a screwdriver (the height of the screw protruding from the upper cover plate 2 was measured with a height vernier caliper).

[0046] Water enters the gap between the upper and lower rock samples through the inlet pipe joint 12 and flows radially. It then passes through the gap between the straightening block 6 and the cylinder 1, entering the annular space 7 of the straightening block 6, and is discharged through the drain pipe joint 13. The torque applied by rotating the screwdriver allows one to feel the close contact between the joint surfaces of the two rock samples. The height of the adjusting rod 5 protruding from the upper cover plate 2 at this point is measured with calipers. During the seepage test, rotating the adjusting rod 5 changes the gap between the joint surfaces of the two rock samples. This allows for the acquisition of permeability characteristics corresponding to different gaps.

[0047] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A rock fracture seepage simulation experimental device, characterized in that, The cylinder includes a cylinder barrel, with an upper cover plate at the top and a lower cover plate at the bottom. A mating ring is fitted and fixed to the outer side of the cylinder barrel near the bottom. The cylinder contains a correction block, the bottom of which is provided with an upper rock sample. An adjusting rod is threaded into the top of the upper cover plate, the bottom of which extends into the cylinder and is rotatably connected to the top of the correction block. The bottom of the inner side of the cylinder is provided with a lower rock sample that is directly opposite the position of the upper rock sample, and a gap is left between the bottom of the upper rock sample and the top of the lower rock sample; A water inlet pipe connector is inserted and fixed at the bottom of the lower cover plate, and through holes are opened on the bottom of the cylinder and the rock mass of the lower rock sample for the water inlet pipe connector to pass through in sequence. The outer side of the correction block has an annular cylindrical space, and a drain pipe connector that communicates with the annular cylindrical space is inserted and fixed into the outer wall of the cylinder. The docking ring and the lower cover plate are sealed and fixed to each other by a locking assembly.

2. The rock fracture seepage simulation experimental apparatus as described in claim 1, characterized in that, The bottom of the inner side of the cylinder and the bottom of the correction block are both provided with receiving grooves. The upper rock sample is bonded and fixed in the receiving groove at the bottom of the correction block, and the lower rock sample is bonded and fixed in the receiving groove at the bottom of the inner side of the cylinder.

3. The rock fracture seepage simulation experimental apparatus as described in claim 1, characterized in that, The locking assembly includes two insert rods fixed relative to each other on the top of the lower cover plate, and the bottom of the cylinder has an insertion hole that engages with the insert rods.

4. The rock fracture seepage simulation experimental apparatus as described in claim 3, characterized in that, The docking ring has two centripetally curved first limiting grooves on its surface. A rotating ring is rotatably sleeved on the outer side of the cylinder. The rotating ring has two radially extended second limiting grooves on its surface. Limiting rods are slidably engaged in both of the first limiting grooves. The top of the limiting rods is slidably engaged in the corresponding second limiting grooves. A centripetally extended locking rod is vertically fixed on the outer wall of the limiting rod. A first locking hole is provided on the outer wall of the cylinder to engage with the locking rod.

5. The rock fracture seepage simulation experimental apparatus as described in claim 4, characterized in that, The outer wall of the insertion rod is provided with a second locking hole that engages with the locking rod.

6. The rock fracture seepage simulation experimental apparatus as described in claim 5, characterized in that, The cylinder wall has radially formed grooves for a locking rod to pass through. A piston that presses against the locking rod is installed in the grooves. The cylinder wall also has axially formed flow channels communicating with the grooves. An annular groove communicating with the flow channels is formed at the bottom of the cylinder. A bladder completely covering the opening of the annular groove is provided. Hydraulic oil is contained in the grooves, flow channels, and annular groove. An annular locking groove is formed at the top of the lower cover plate. When the lever presses against the piston, it squeezes the hydraulic oil in the flow channel, forcing the bladder to expand and deform to seal and engage with the slot.

7. The rock fracture seepage simulation experimental apparatus as described in claim 6, characterized in that, The top of the docking ring is rotatably inserted with a rotating rod parallel to the cylinder axis. A gear is fixedly sleeved on the outside of the rotating rod, and a toothed ring that meshes with the gear is fixedly sleeved on the outside of the rotating ring.

8. The rock fracture seepage simulation experimental apparatus as described in claim 7, characterized in that, A disc is fixed to the top of the rotating rod, and a locking rod is axially inserted into the disc. A locking hole is opened on the top of the docking ring to engage with the locking rod.

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