Rock core testing device based on expanding agent

Abstract

The utility model provides a rock core testing device based on an expanding agent. The rock core testing device comprises a filling body, an adjusting flow guide structure, a sleeving assembly and a pressure sensor. The filling body is arranged in a drill hole of the rock core and is used for filling the expanding agent; the adjusting flow guide structure communicates with the filling body and is used for adjusting the position of the filling body in the drill hole and conducting flow guide on the expanding agent; the sleeving assembly is arranged on the periphery of the rock core, and the sleeving assembly comprises an acoustic emission sensor used for monitoring sound production of the rock core; the multiple pressure sensors are arranged on the pouring body at intervals around the central axis of the pouring body and used for monitoring the expansion cracking stress of the rock core. The utility model provides a rock core testing device based on an expanding agent, and aims to solve the problem that in the prior art, a triaxial test is adopted to carry out a stress test on rock in a laboratory, and the state of a rock sample is changed, so that an experimental result is inaccurate.

Description

Technical Field

[0001] The utility model belongs to the technical field of rock stress measurement, and particularly relates to a core test device based on an expansive agent. Background Art

[0002] Measuring the mechanical parameters of rock samples is an essential part of underground production work, which is of great significance for understanding the underground stress characteristics and formation stress distribution. The rock triaxial test is a test for measuring and studying the deformation and strength characteristics of rocks under triaxial stress conditions and needs to be carried out in a laboratory.

[0003] In the prior art, for the rock triaxial test, after on-site sampling, the rock samples need to be sent to an indoor laboratory for triaxial test experiments to obtain data such as the maximum principal stress and Kaiser point of the rock. Since the rock samples need to be sent to the laboratory for experiments, the state of the rock samples changes compared with the state when they are just taken out from the ground, which may lead to inaccurate experimental results. Moreover, the test takes a long time, the test efficiency is low, and the practicability is poor. Summary of the Utility Model

[0004] The utility model provides a core test device based on an expansive agent, aiming to solve the problem that in the prior art, when stress testing of rocks is carried out by triaxial test in a laboratory, the state of the rock samples changes, resulting in inaccurate experimental results.

[0005] To achieve the above object, the technical solution adopted by the utility model is: to provide a core test device based on an expansive agent, including:

[0006] A perfusion body, which is arranged in the drill hole of the core and is used for pouring the expansive agent;

[0007] An adjustment and diversion structure, which is communicated with the perfusion body and is used for adjusting the position of the perfusion body in the drill hole and guiding the flow of the expansive agent;

[0008] A sleeving component, which is arranged on the outer periphery of the core, and the sleeving component includes an acoustic emission sensor for monitoring the sound of the core;

[0009] A plurality of pressure sensors, each of the pressure sensors is arranged on the perfusion body at intervals around the central axis of the perfusion body and is used for monitoring the stress of the core during expansion and cracking.

[0010] In a possible implementation manner, the perfusion body is a rubber sleeve.

[0011] In a possible implementation manner, the adjustment and diversion structure includes:

[0012] A telescopic adjuster, which has a fixed end and a telescopic end, and the fixed end is connected to the perfusion body;

[0013] A flow guide member, which is connected to the telescopic end and communicates with the perfusion body, is used to guide the expander to the perfusion body.

[0014] In a possible implementation manner, the telescopic regulator includes a sleeve rod and an adjusting rod. The sleeve rod is connected to the core. The adjusting rod is threadedly connected to the sleeve rod. The upper end of the adjusting rod communicates with the flow guide member, and the lower end communicates with the perfusion body. The sleeve rod is provided with internal threads and an avoidance hole. The adjusting rod is provided with external threads adapted to the internal threads, and the adjusting rod has a through hole.

[0015] In a possible implementation manner, the flow guide member includes a flow guiding portion and a connecting portion. The connecting portion is a conical structure. The connecting portion has a feed end and a discharge end. The size of the feed end is larger than that of the discharge end. The flow guiding portion is connected to the feed end of the connecting portion.

[0016] In a possible implementation manner, a plurality of card slots are provided on the flow guiding portion. Each of the card slots is arranged at intervals around the central axis of the flow guide member on the flow guiding portion.

[0017] In a possible implementation manner, the sleeving assembly includes a surrounding plate. The surrounding plate is sleeved around the outer periphery of the core. A plurality of acoustic emission sensors are provided. Each of the acoustic emission sensors is arranged at intervals around the central axis of the core on the surrounding plate.

[0018] In a possible implementation manner, the core testing device based on the expander further includes a data acquisition system and an information analysis and display system. The data acquisition system is electrically connected to each of the acoustic emission sensors and each of the pressure sensors. The information analysis and display system is electrically connected to the data acquisition system.

[0019] The beneficial effects of the core testing device based on an expansive agent provided by the present utility model are as follows: Compared with the prior art, by setting a drill hole in the core and arranging a perfusion body in the drill hole, an expansive agent is injected into the drill hole through the perfusion body. At the same time, an adjustment and diversion structure communicated with the perfusion body is also provided, and the position of the perfusion body in the drill hole is adjusted through the adjustment and diversion structure, so that the expansive agent can be evenly perfused in the drill hole, making the expansion pressure more uniform and reducing the interference of factors such as bedding joints and weak plane joints on expansion cracking. A plurality of pressure sensors are arranged on the perfusion body, and the stress of core expansion cracking can be monitored through each pressure sensor. At the same time, acoustic emission sensors are arranged on the outer periphery of the core to monitor the sound of the core, so that core acoustic emission information and corresponding pressure information can be obtained. Then, by observing the cracking direction of the core cracks, the maximum principal stress is obtained from the Kaiser point obtained by the acoustic emission sensor, the maximum horizontal principal stress direction is obtained from the macroscopic cracking direction of the core, and the compressive strength of the rock sample is obtained from the pressure information when the core cracks. This application directly conducts test experiments on-site during sampling to obtain the maximum principal stress and compressive strength of the rock sample, improving the accuracy of the test results, saving the time for transferring the rock sample, and improving work efficiency, with good practicability. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the core testing device based on an expansive agent provided by an embodiment of the present utility model;

[0021] Figure 2 It is a schematic diagram of the cooperation structure of the perfusion body, the sleeving assembly and the core of the core testing device based on an expansive agent provided by an embodiment of the present utility model;

[0022] Figure 3 It is a schematic structural diagram of the diversion member of the core testing device based on an expansive agent provided by an embodiment of the present utility model;

[0023] Figure 4 It is a schematic diagram of the unfolded structure of the enclosing plate of the core testing device based on an expansive agent provided by an embodiment of the present utility model.

[0024] Description of the Reference Numerals:

[0025] 10. Perfusion body; 20. Adjustment and diversion structure; 21. Diversion member; 211. Diversion part; 212. Connection part; 213. Card slot; 22. Sleeve rod; 23. Adjusting rod; 30. Sleeving assembly; 31. Enclosing plate; 32. Acoustic emission sensor; 40. Pressure sensor; 50. Core; 51. Drill hole. Detailed Embodiments

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0027] It should be noted that the orientation or positional relationship indicated by the terms "length", "width", "height", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0028] It should also be noted that unless otherwise clearly specified and defined, terms such as "installation", "connection", "fixation", "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In addition, the meanings of "multiple" and "several" are two or more, unless otherwise clearly and specifically defined.

[0030] Please refer to Figures 1 to 4 , and now the core testing device based on an expanding agent provided by the present utility model will be described. The core testing device based on an expanding agent includes a perfusion body 10, an adjusting and guiding structure 20, a sleeving assembly 30, and a pressure sensor 40. The perfusion body 10 is arranged in the drill hole 51 of the core 50 for pouring the expanding agent. The adjusting and guiding structure 20 is communicated with the perfusion body 10 for adjusting the position of the perfusion body 10 in the drill hole 51 and guiding the expanding agent. The sleeving assembly 30 is arranged on the outer periphery of the core 50. The sleeving assembly 30 includes an acoustic emission sensor 32 for monitoring the sound emitted by the core 50. The number of the pressure sensors 40 is multiple, and each pressure sensor 40 is arranged on the perfusion body 10 at intervals around the central axis of the perfusion body 10 for monitoring the stress of the core expansion and cracking.

[0031] In this embodiment, the core 50 can be directly tested on-site at the sampling site. A borehole 51 is provided on the core 50, and the aperture of the borehole does not affect the strength of the core 50. A perfusion body 10 is arranged in the borehole 51 of the core 50, so that the expansive agent can be injected into the borehole 51 of the core 50 through the perfusion body 10. An adjustable diversion structure 20 is provided in communication with the perfusion body 10, and the adjustable diversion structure 20 can adjust the position of the perfusion body 10 in the borehole 51 to facilitate the diversion of the expansive agent into the core borehole 51. At the same time, a sleeving assembly 30 is provided on the outer periphery of the core 50, and the sleeving assembly 30 includes an acoustic emission sensor 32 for monitoring the sound emitted by the core 50. A plurality of pressure sensors 40 are arranged on the perfusion body 10, and the pressure sensors 40 are arranged on the perfusion body 10 at intervals around the central axis of the perfusion body 10, and the stress of the core expansion and cracking in each direction can be measured evenly. When the expansive agent reacts with water, heat is released and volume expansion occurs, thereby generating a volume expansion force. Through the perfusion body 10, the expansive agent can be applied more evenly, controllably and observably. The maximum principal stress direction of the core 50 underground is judged by the cracking pattern of the core 50 due to the expansive agent. The Kaiser point and the fracture stress are obtained by using the pressure sensor 40 on the perfusion body 10 close to the borehole 51, and mechanical parameters such as the compressive strength and the maximum horizontal principal stress are obtained by using the acoustic emission sensor 32.

[0032] The core testing device based on the expansive agent provided by the embodiment of the present invention, compared with the prior art, sets a borehole 51 on the core 50, and arranges a perfusion body 10 in the borehole 51, and injects the expansive agent into the borehole 51 through the perfusion body 10. At the same time, an adjustable diversion structure 20 in communication with the perfusion body 10 is also provided, and the position of the perfusion body 10 in the borehole 51 is adjusted through the adjustable diversion structure 20, so that the expansive agent can be evenly injected into the borehole 51, making the expansion pressure more uniform and reducing the interference of factors such as bedding joints and weak surface joints on the expansion and cracking. A plurality of pressure sensors 40 are arranged on the perfusion body 10, and the stress of the core expansion and cracking can be monitored through each pressure sensor 40. At the same time, an acoustic emission sensor 32 is arranged on the outer periphery of the core 50 to monitor the sound emitted by the core 50, so that the acoustic emission information and the corresponding pressure information of the core 50 can be obtained. Then, by observing the cracking direction of the core 50, the maximum principal stress is obtained from the Kaiser point obtained by the acoustic emission sensor 32, the maximum horizontal principal stress direction is obtained from the macroscopic cracking direction, and the compressive strength of the rock sample is obtained from the pressure information when the core cracks. This application directly conducts the test on-site at the sampling site to obtain the maximum principal stress and compressive strength of the rock sample, improves the accuracy of the test results, saves the time for transferring the rock sample, improves the work efficiency, and has good practicability.

[0033] The Kaiser point is the turning point from very few acoustic emissions to a large number of acoustic emissions under the action of material stress, and the corresponding stress is the maximum stress that the material has previously experienced. In rock mechanics, by measuring the Kaiser point, the maximum stress that a rock sample has experienced before can be inferred, and thus the geological stress state of the rock can be understood. For example, through a loading acoustic emission test on a rock sample, when the stress exceeds its historical maximum stress value, the number of acoustic emission events will increase significantly, and this turning point is the Kaiser point.

[0034] In some embodiments, the perfusion body 10 is a rubber sleeve. The rubber sleeve can make the expansion pressure more uniform, reduce the interference of factors such as bedding joints and weak surface joints on expansion cracking, and can better handle the rock samples after the test, replace the equipment and observe the cracks.

[0035] In some embodiments, please refer to Figure 1 , the adjusting and guiding structure 20 includes a telescopic adjuster and a guiding member 21. The telescopic adjuster has a fixed end and a telescopic end, and the fixed end is connected to the perfusion body 10. The guiding member 21 is connected to the telescopic end and is in communication with the perfusion body 10 for guiding the expander into the perfusion body 10. In this embodiment, by connecting the guiding member 21 with the perfusion body 10, the expander is drained into the perfusion body 10 through the guiding member 21, which is convenient for injecting the expander into the perfusion body 10 and avoiding the leakage of the expander. At the same time, the guiding member 21 is also connected to the telescopic end of the telescopic adjuster, so that the position of the perfusion body 10 in the drill hole 51 can be adjusted through the telescopic adjuster, and thus the expander can be uniformly perfused in the drill hole 51.

[0036] In some embodiments, please refer to Figure 1 , the telescopic adjuster includes a sleeve rod 22 and an adjusting rod 23. The sleeve rod 22 is connected to the rock core 50. The adjusting rod 23 is threadedly connected to the sleeve rod 22. The upper end of the adjusting rod 23 is in communication with the guiding member 21, and the lower end is in communication with the perfusion body 10. The sleeve rod 22 is provided with internal threads and an avoidance hole. The adjusting rod 23 is provided with external threads adapted to the internal threads, and the adjusting rod 23 has a through hole. In this embodiment, the sleeve rod 22 is provided with internal threads and the adjusting rod 23 is provided with external threads, so that the combined length of the adjusting rod 23 and the sleeve rod 22 can be adjusted by adjusting the position of the adjusting rod 23. The lower end of the adjusting rod 23 is in communication with the perfusion body 10, and the sleeve rod 22 is provided with an avoidance hole. The perfusion body 10 can pass through the avoidance hole, and then the adjusting rod 23 drives the perfusion body 10 to move to adjust the position of the perfusion body 10 in the drill hole 51. The adjusting rod 23 is in communication with the guiding member 21 and has a through hole, so that the expander can pass through the guiding member 21, the adjusting rod 23 and then enter the perfusion body 10.

[0037] In some embodiments, please refer to Figure 1 and Figure 3, the flow guiding member 21 includes a flow guiding portion 211 and a connecting portion 212. The connecting portion 212 is of a conical structure. The connecting portion 212 has a feed end and a discharge end, and the size of the feed end is larger than that of the discharge end. The flow guiding portion 211 is connected to the feed end of the connecting portion 212. In this embodiment, the flow guiding member 21 is of a funnel-shaped structure. The connecting portion 212 is of a conical structure, and the size of the feed end of the connecting portion 212 is larger than that of the discharge end, so as to facilitate the injection of the expansive agent into the perfusion body 10 and avoid the leakage of the expansive agent.

[0038] In some embodiments, please refer to Figure 1 and Figure 3 , a plurality of card slots 213 are provided on the flow guiding portion 211, and the card slots 213 are arranged on the flow guiding portion 211 at intervals around the central axis of the flow guiding member 21. In this embodiment, the number of the pressure sensors 40 is multiple, and the pressure signal cables of the pressure sensors 40 are bundled through the card slots 213 on the flow guiding portion 211, improving the safety.

[0039] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 4 , the sleeving assembly 30 includes a surrounding plate 31, and the surrounding plate 31 is sleeved around the outer periphery of the core 50. A plurality of acoustic emission sensors 32 are provided, and the acoustic emission sensors 32 are arranged on the surrounding plate 31 at intervals around the central axis of the core 50. In this embodiment, since the expansion and cracking part usually occurs first in the middle and lower part of the drilling hole 51, the surrounding plate 31 is sleeved on the middle and lower part of the core 50 and closely attached to the core 50. A plurality of acoustic emission sensors 32 are provided, and the acoustic emission sensors 32 are arranged on the surrounding plate 31 at intervals around the central axis of the core 50. A coupling agent is smeared on the surface where the acoustic emission sensors 32 contact the core 50, and the information of the expansion and cracking process is monitored through the acoustic emission sensors 32.

[0040] In some embodiments, the core testing device based on the expansive agent provided by the embodiment of the present invention further includes a data acquisition system (not shown in the figure) and an information analysis and display system (not shown in the figure). The data acquisition system is electrically connected to each acoustic emission sensor 32 and each pressure sensor 40. The information analysis and display system is electrically connected to the data acquisition system. In this embodiment, the data acquisition system is electrically connected to each acoustic emission sensor 32 and the pressure sensor 40. The acoustic emission information and the cracking stress information inside the core during the test period are collected through the data acquisition system, and then the measured acoustic emission information and the cracking stress information are analyzed through the information analysis and display system to obtain the maximum principal stress and the compressive strength of the rock sample.

[0041] Specifically, the data acquisition system and the information analysis and display system can adopt the existing technologies.

[0042] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A core testing device based on an expansion agent, characterized in that: include: A pouring body, arranged in the drill hole of the core, for pouring the expansion agent; An adjusting and guiding structure is communicated with the perfusion body and is used to adjust the position of the perfusion body in the borehole and guide the expansion agent; A casing assembly is arranged on the periphery of the core, and the casing assembly includes an acoustic emission sensor for monitoring the sound of the core; There are multiple pressure sensors, each of which is arranged on the injection body at intervals around the central axis of the injection body to monitor the stress of core expansion and cracking.

2. The core testing device based on expansion agent according to claim 1, characterized in that: The injection body is a rubber sleeve.

3. The core testing device based on expansion agent according to claim 1, characterized in that: The regulating and guiding structure comprises: A telescopic adjuster having a fixed end and a telescopic end, wherein the fixed end is connected to the perfusion body; The guide piece is connected with the telescopic end and communicated with the perfusion body, and is used for guiding the expansion agent into the perfusion body.

4. The core testing device based on expansion agent according to claim 3, characterized in that: The telescopic adjuster includes a sleeve rod and an adjusting rod, the sleeve rod is connected to the rock core; the adjusting rod is threadedly connected to the sleeve rod, the upper end of the adjusting rod is connected to the guide member, and the lower end is connected to the injection body; the sleeve rod is provided with an internal thread, and the sleeve rod is provided with an avoidance hole; the adjusting rod is provided with an external thread adapted to the internal thread, and the adjusting rod has a through hole.

5. The core testing device based on expansion agent according to claim 3, characterized in that: The flow guide comprises a flow guide portion and a connecting portion, wherein the connecting portion is a conical structure, and the connecting portion has a feed end and a discharge end, the size of the feed end is larger than the size of the discharge end, and the flow guide portion is connected to the feed end of the connecting portion.

6. The expansion agent-based core testing device according to claim 5, characterized in that: The guide portion is provided with a plurality of slots, and the slots are arranged on the guide portion at intervals around the central axis of the guide member.

7. The expansion agent-based core testing device according to claim 1, characterized in that: The sleeve assembly includes a surrounding plate, which is sleeved around the outer periphery of the rock core; a plurality of acoustic emission sensors are provided, and each of the acoustic emission sensors is arranged on the surrounding plate at intervals around the central axis of the rock core.

8. The expansion agent-based core testing device according to claim 7, characterized in that: The expansion agent-based core testing device also includes a data acquisition system and an information analysis and display system. The data acquisition system is electrically connected to each of the acoustic emission sensors and each of the pressure sensors; the information analysis and display system is electrically connected to the data acquisition system.

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