A fracture grouting filling simulation test device and test method with segmented sampling

Abstract

The invention discloses a fracture grouting filling simulation test device and test method for segmented sampling, belonging to the field of coal mine water prevention and control, including a long fracture assembly mother box, the long fracture assembly mother box including a long fracture assembly mother box side panel, the long fracture assembly mother box side panel is provided with a partition for dividing the long fracture assembly mother box into a plurality of prefabricated rough fracture test block filling chambers; the prefabricated rough fracture test block filling chamber is provided with a prefabricated rough fracture test block; the upper part of the long fracture assembly mother box is provided with a long fracture assembly mother box top plate, the long fracture assembly mother box top plate is connected with a slurry pump for injecting slurry; and also includes a long fracture assembly mother box front and rear panels, the long fracture assembly mother box front and rear panels correspond to the middle position of each layer of the partition and are provided with a circular hole, and the circular hole is closed by the long fracture assembly mother box front and rear panel opening sealing plug. The invention can realize the segmented acquisition of slurry-filled fracture test pieces, greatly reducing the damage to the test pieces during the extraction process.

Description

Technical Field

[0001] The invention relates to the field of supports, and in particular to a fracture grouting filling simulation test device and a test method for segmented sampling. Background Art

[0002] Long-cracked rock mass is one of the common geological problems in underground engineering construction. Due to the uneven distribution and properties of cracks, they seriously weaken the strength and integrity of the rock mass, which may lead to geological disasters such as engineering instability, landslides and sudden water inrush. In order to solve this problem, one of the most commonly used and effective prevention and control measures is grouting reinforcement. However, in actual construction, factors such as the unevenness of the geometric characteristics of the cracks and the segregation effect of the slurry under the action of gravity will cause significant differences in the grouting effect in the length direction of the cracks. Therefore, in order to better evaluate and guide grouting construction, it is necessary to conduct indoor tests to study the mechanical properties of long-crack grouting.

[0003] In existing long-crack grouting tests, tools such as cutters and coring drills are usually used to obtain fractured rock specimens. However, this method has some problems. First, the dimensional accuracy of the specimens is usually insufficient, which may lead to inaccurate test results. Second, during the cutting process, the specimens are often severely damaged, which will have a non-negligible impact on subsequent mechanical tests. Therefore, it is necessary to improve the test equipment and methods to improve the accuracy and reliability of the data.

[0004] Therefore, in order to improve the accuracy and reliability of data, it is necessary to consider the heterogeneity of fractures and the segregation effect of slurry. By adopting advanced technologies and methods such as non-destructive testing, high-precision coring, segmented sampling and mechanical testing, the changes in the mechanical properties of fractured rock mass can be more accurately evaluated, thereby effectively reducing the risk of geological disasters and ensuring the safe construction of underground projects. Summary of the invention

[0005] According to the above existing technologies, long crack grouting tests often use cutting machines, coring drills, etc. to obtain test specimens. The test specimens have insufficient dimensional accuracy and are often severely damaged during the cutting process, which has a significant impact on subsequent mechanical tests. A fracture grouting filling simulation test device and test method with segmented sampling are provided.

[0006] The present invention is achieved through the following technical solutions: a segmented sampling fracture grouting filling simulation test device, comprising a long fracture assembly mother box, the long fracture assembly mother box comprising a long fracture assembly mother box side panel, the long fracture assembly mother box side panel is provided with a partition that divides the long fracture assembly mother box into a plurality of prefabricated rough fracture test block filling chambers; the prefabricated rough fracture test block filling chamber is provided with a prefabricated rough fracture test block; the upper part of the long fracture assembly mother box is provided with a long fracture assembly mother box top plate, the long fracture assembly mother box top plate is connected to a slurry pump for injecting slurry; and also includes front and rear panels of the long fracture assembly mother box, the front and rear panels of the long fracture assembly mother box correspond to the middle position of each layer of partition and are provided with circular holes, and the circular holes are closed by sealing plugs of the openings of the front and rear panels of the long fracture assembly mother box.

[0007] As a further improvement of the above technical solution, two partitions are provided, and the two partitions are disconnected in the middle to form a crack channel.

[0008] As a further improvement of the above technical solution, it also includes a base, and the long crack assembly mother box is fixed on the base and supported laterally by a support plate.

[0009] As a further improvement of the above technical solution, a limit slot is provided on the base, and the lower part of the support plate is placed in the limit slot.

[0010] As a further improvement of the above technical solution, it also includes a slurry pump pipeline connection port, which is arranged on the top plate of the long crack assembly mother box and is connected to the slurry pump through a pipeline.

[0011] As a further improvement of the above technical solution, it also includes a connecting port valve, an exhaust port and an exhaust port valve; the connecting port valve is connected to the slurry pump pipeline connecting port, the exhaust port is connected to the connecting port valve, and the exhaust port valve is connected to the exhaust port.

[0012] As a further improvement of the above technical solution, it also includes a sewage outlet and a sewage outlet valve, wherein the sewage outlet is arranged at the bottom of the long crack assembly mother box, and the sewage outlet valve is arranged on the sewage outlet.

[0013] A test method for a fracture grouting filling simulation test device with segmented sampling comprises the following steps:

[0014] Adjust the support plate to make the side panels of the long crack assembly mother box stand upright, fill the prefabricated rough crack test blocks into the long crack assembly mother box and seal and fix them with the upper and lower partitions with foam glue, assemble the front and rear panels of the long crack assembly mother box, and seal the front and rear panels of the long crack assembly mother box with the sealing plugs of the openings of the front and rear panels of the long crack assembly mother box;

[0015] Install the top plate of the long crack assembly mother box, and adjust the support plate to make the long crack assembly mother box reach the test working condition position;

[0016] Connect the slurry pump to the top plate slurry pump pipeline connection port through the pipeline, open the exhaust port valve, close the sewage outlet valve, start the slurry pump to fill the long crack assembly mother box with clean water and check the sealing;

[0017] Open the sewage outlet valve to drain the clean water, and start the slurry pump to inject slurry;

[0018] After the bubbles of slurry discharged from the sewage outlet disappear, close the sewage outlet valve; after the slurry fills the fissure and long fissure assembly mother box, close the slurry pump and the exhaust port valve;

[0019] After the slurry is initially solidified, the sealing plugs of the openings of the front and rear panels of the long-crack assembly mother box on the long-crack assembly mother box are removed from top to bottom, and the rectangular cutting knives are inserted in sequence to cut off the slurry at the openings of each layer of partitions, and the rectangular cutting knives are not removed;

[0020] After the slurry has hardened for 24 hours, disassemble the front and rear panels and the top plate of the long crack assembly mother box, take out the slurry-filled crack specimens, and clean each component.

[0021] Compared with the prior art, the present invention has the following beneficial effects: while facilitating the construction of long crack models with different crack surface roughness, the present invention solves the problem of segmented acquisition of slurry-filled crack specimens, and reveals the changing law of the non-uniform reinforcement effect of slurry on long cracks; the present invention constructs long cracks in an assembling manner, which reduces the difficulty of constructing long cracks and realizes flexible adjustment of geometric features such as the roughness of each part of the long crack surface and the inclination angle of the long crack; the present invention can realize the segmented acquisition of slurry-filled crack specimens, greatly reducing the damage to the specimens during the extraction process; the technical solution of the present invention has the advantages of low cost, simple structure and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the overall assembly of an embodiment of the present invention.

[0023] Figure 2 Assemble the mother box section for the long crack.

[0024] Figure 3 Structural diagram of the front and rear panels of the mother box for long crack assembly.

[0025] Figure 4 Schematic diagram of a rectangular cutting knife.

[0026] The reference numerals in the figure are indicated as follows: 1. long crack assembly mother box; 2. base; 3. support plate; 4. slurry pump; 5. long crack assembly mother box top plate; 6. slurry pump pipeline connection port; 7. connection port valve; 8. exhaust port; 9. exhaust port valve; 10. sewage outlet; 11. sewage outlet valve; 12. limit slot; 13. long crack assembly mother box side panel; 14. partition; 15. prefabricated rough crack test block; 16. prefabricated rough crack test block filling chamber; 17. crack channel; 18. long crack assembly mother box front and rear panels; 19. long crack assembly mother box front and rear panel opening sealing plugs; 20. rectangular cutting knife. DETAILED DESCRIPTION

[0027] The present invention is further described below through specific embodiments in conjunction with the accompanying drawings, but the present invention is not limited thereto. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0028] refer to Figure 1-4 As shown, the present invention discloses a fracture grouting filling simulation test device for segmented sampling, comprising a long fracture assembly mother box 1, wherein the long fracture assembly mother box 1 comprises a long fracture assembly mother box side panel 13, and the long fracture assembly mother box side panel 13 is provided with a partition 14 for dividing the long fracture assembly mother box 1 into a plurality of prefabricated rough fracture test block filling chambers 16; wherein the partition 14 is provided with two, and the middle of the two partitions 14 is disconnected to form a fracture channel 17, and the fracture channel 17 here is a slurry injection chamber. Inlet and outlet; a prefabricated rough crack test block 15 is arranged in the prefabricated rough crack test block filling chamber 16; a long crack assembly mother box top plate 5 is arranged on the upper part of the long crack assembly mother box 1, and the long crack assembly mother box top plate 5 is connected to a slurry pump 4 for injecting slurry; it also includes front and rear panels 18 of the long crack assembly mother box, and the front and rear panels 18 of the long crack assembly mother box correspond to the middle position of each layer of partition 14 and are provided with a circular hole, which is closed by a detachable long crack assembly mother box front and rear panel opening sealing plug 19.

[0029] It also includes a base 2, and the long crack assembly mother box 1 is fixed on the base 2 and supported laterally by a support plate 3. The base 2 can facilitate the installation and use of the long crack assembly mother box 1; in the present embodiment, the bottom of the long crack assembly mother box 1 is connected to the base 2 by a hinge, so that the long crack assembly mother box 1 can rotate freely laterally; at the same time, a limiting slot 12 is provided on the base 2, and the lower part of the support plate 3 is placed in the limiting slot 12. By adjusting the position of the support plate 3 in the limiting slot 12, the lateral angle adjustment of the long crack assembly mother box 1 can be achieved.

[0030] It also includes a slurry pump pipeline connection port 6, which is arranged on the top plate 5 of the long crack assembly mother box and is connected to the slurry pump 4 through a pipeline.

[0031] It also includes a connecting port valve 7, an exhaust port 8 and an exhaust port valve 9; the connecting port valve 7 is connected to the slurry pump pipeline connecting port 6, the exhaust port 8 is connected to the connecting port valve 7, and the exhaust port valve 9 is connected to the exhaust port 8.

[0032] It also includes a sewage outlet 10 and a sewage outlet valve 11. The sewage outlet 10 is arranged at the bottom of the long crack assembly mother box 1. The sewage outlet valve 11 is arranged on the sewage outlet 10. The sewage outlet valve 11 can control the opening and closing of the sewage outlet 10.

[0033] Another aspect of the present invention is combined with the above-mentioned segmented sampling fracture grouting filling simulation test device, and its use test method includes the following steps, specifically,

[0034] (1) Before the test begins, the side panels 13 of the long crack assembly mother box are made upright by adjusting the support plate 3, the prefabricated rough crack test block 15 is loaded into the long crack assembly mother box 1 and sealed and fixed with the upper and lower partitions 14 by foam glue, the front and rear panels 18 of the long crack assembly mother box are assembled, and the openings on the front and rear panels 18 of the long crack assembly mother box are sealed with the front and rear panel opening sealing plugs 19 of the long crack assembly mother box;

[0035] (2) Install the top plate 5 of the long crack assembly mother box, and adjust the support plate 3 to make the long crack assembly mother box 1 to the test working condition position;

[0036] (3) Connect the slurry pump 4 to the top plate slurry pump pipeline connection port 6 through a pipeline, open the exhaust port valve 9, close the sewage outlet valve 11, start the slurry pump 4 to fill the long crack assembly mother box 1 with clean water and check the sealing performance;

[0037] (4) After ensuring that the device is well sealed, open the sewage outlet valve 11 to discharge clean water, and start the slurry pump 4 to inject slurry;

[0038] (5) After the bubbles of slurry discharged from the sewage outlet 10 disappear, gradually close the sewage outlet valve 11, and after the slurry fills the crack long crack assembly mother box 1, close the slurry pump 4 and the exhaust valve 9;

[0039] (6) After the slurry is initially solidified, the sealing plugs 19 of the openings of the front and rear panels of the long-crack assembly mother box 1 are removed from top to bottom, and the rectangular cutting knives 20 are inserted in sequence to cut off the slurry at the openings of each layer of the partition 14, and the rectangular cutting knives 20 are not removed;

[0040] (7) After the slurry has hardened for 24 hours, the front and rear panels 18 and the top plate 5 of the long crack assembly mother box are disassembled, the slurry-filled crack test piece is taken out, and each component is cleaned.

[0041] It can be seen from the above embodiments that the present invention has the following effects:

[0042] (1) The present invention adopts an assembly method to construct a long crack, which reduces the difficulty of constructing the long crack and can realize the flexible adjustment of geometric features such as the roughness of each part of the long crack surface and the inclination angle of the long crack;

[0043] (2) The present invention can realize the segmented acquisition of slurry-filled fracture specimens, greatly reducing the damage to the specimens during the extraction process;

[0044] (3) The technical solution of the present invention has the advantages of low cost, simple structure and easy operation.

[0045] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A fracture grouting filling simulation test device with segmented sampling, characterized in that: The invention comprises a long crack assembly mother box (1), wherein the long crack assembly mother box (1) comprises a long crack assembly mother box side panel (13), wherein the long crack assembly mother box side panel (13) is provided with a partition (14) for dividing the long crack assembly mother box (1) into a prefabricated rough crack test block filling chamber (16); a prefabricated rough crack test block (15) is arranged in the prefabricated rough crack test block filling chamber (16); a long crack assembly mother box top panel (5) is arranged on the upper part of the long crack assembly mother box (1), wherein the long crack assembly mother box top panel (5) is connected to a slurry pump (4) for injecting slurry; and further comprises front and rear panels (18) of the long crack assembly mother box, wherein the front and rear panels (18) of the long crack assembly mother box correspond to the middle position of each layer of the partition (14) and are provided with a circular hole, and the circular hole is sealed by a sealing plug (19) for opening a hole in the front and rear panels of the long crack assembly mother box; Two partitions (14) are provided, and the two partitions (14) are disconnected in the middle to form a crack channel (17); It also comprises a base (2), the long crack assembly mother box (1) being fixed on the base (2) and supported laterally by a support plate (3); The base (2) is provided with a limit slot (12), and the lower part of the support plate (3) is placed in the limit slot (12); It also includes a slurry pump pipeline connection port (6), wherein the slurry pump pipeline connection port (6) is arranged on the top plate (5) of the long crack assembly mother box and is connected to the slurry pump (4) through a pipeline; It also comprises a connecting port valve (7), an exhaust port (8) and an exhaust port valve (9); the connecting port valve (7) is connected to the slurry pump pipeline connecting port (6), the exhaust port (8) is connected to the connecting port valve (7), and the exhaust port valve (9) is connected to the exhaust port (8); It also comprises a sewage outlet (10) and a sewage outlet valve (11); the sewage outlet (10) is arranged at the bottom of the long crack assembly mother box (1); and the sewage outlet valve (11) is arranged on the sewage outlet (10).

2. A method for conducting a test using the segmented sampling fracture grouting filling simulation test device according to claim 1, characterized in that: The following steps are included: S1: adjusting the support plate (3) to make the side panel (13) of the long crack assembly mother box stand upright, loading the prefabricated rough crack test block (15) into the long crack assembly mother box (1) and sealing and fixing it with the upper and lower partitions (14) with foam glue, assembling the front and rear panels (18) of the long crack assembly mother box, and sealing the openings on the front and rear panels (18) of the long crack assembly mother box with the front and rear panel opening sealing plugs (19) of the long crack assembly mother box; S2: Install the top plate (5) of the long crack assembly mother box, and adjust the support plate (3) to move the long crack assembly mother box (1) to the test working condition position; S3: Connect the slurry pump (4) to the top plate slurry pump pipeline connection port (6) through a pipeline, open the exhaust port valve (9), close the sewage outlet valve (11), start the slurry pump (4), fill the long crack assembly mother box (1) with clean water, and check the sealing performance; S4: Open the sewage outlet valve (11) to discharge the clean water, and start the slurry pump (4) to inject the slurry; S5: After the bubbles of the slurry discharged from the sewage outlet (10) disappear, the sewage outlet valve (11) is gradually closed, and after the slurry fills the fracture long fracture assembly mother box (1), the slurry pump (4) and the exhaust port valve (9) are closed; S6: After the slurry is initially solidified, the sealing plugs (19) of the openings of the front and rear panels of the long-crack assembly mother box (1) are removed from top to bottom, and the rectangular cutting knives (20) are inserted in sequence to cut off the slurry at the openings of each layer of the partition (14), and the rectangular cutting knives (20) are not removed; S7: After the slurry has hardened for 24 hours, the front and rear panels (18) of the long crack assembly mother box and the top plate (5) of the long crack assembly mother box are disassembled, the slurry-filled crack test piece is taken out, and each component is cleaned.

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