Simulation test equipment for relieving stress of primary rock

Abstract

The invention provides protolith stress relief simulation test equipment, which can be used for carrying out simulation operation on a stress relief measurement technology used by field crustal stress in a laboratory. Comprising a stress simulation device which can perform real three-dimensional crustal stress environment simulation on a test rock mass as much as possible; and the drilling releasing device is provided with a hollow drill bit used for drilling strain measurement equipment installed in the test rock mass, and the drilling hole and the hollow drill bit are coaxially arranged. Therefore, the test equipment can calibrate a series of parameters of the strain measurement equipment required by stress relief, and more accurate crustal stress data can be obtained in field application.

Description

Technical Field

[0001] The invention relates to the technical field of rock mass mechanics test equipment, and in particular to original rock stress relief simulation test equipment. Background Art

[0002] At present, my country's shallow mineral resources are gradually mined and are heading towards deep resource mining. In deep engineering, the geostress environment is more complex and changeable than that in shallow engineering. The dynamic disasters caused by geostress seriously threaten the safety of life and property of mining enterprises. Therefore, the measurement of geostress has become an important research content in the fields of geotechnical engineering and mining. With the continuous development of geostress measurement technology, stress relief method is currently a more common measurement method. In field operations, more accurate geostress-related values ​​can be obtained through stress relief method. However, due to the strain measurement equipment, the data still has errors. Therefore, parameter calibration and research are required in the laboratory. In related technologies, most of them are biaxial loading, simulation in a two-dimensional stress environment, and drilling and drilling for stress relief cannot continuously simulate the real three-dimensional geostress environment. This will undoubtedly lead to errors in the relevant values ​​of geostress. This error may affect the safety of engineering design and construction, as well as the stability of geotechnical engineering. It is urgent to design a test equipment to make up for the defects of current research. Summary of the invention

[0003] In view of this, an object of the present invention is to provide an in-situ rock stress relief simulation test equipment for improving the accuracy of relevant data obtained by measurement, so as to at least partially solve the problems in the related technology.

[0004] Based on the above purpose, the present invention provides an in-situ rock stress relief simulation test equipment, comprising:

[0005] A stress simulation device, comprising a bearing platform and a reaction force component mounted on the bearing platform, wherein the bearing platform is provided with a placement position for placing a test rock mass, both ends of the reaction force component arranged opposite to each other along a first direction are provided with openings for a hydraulic loading column to pass through, an end of the reaction force component away from the placement position is provided with the opening for the hydraulic loading column to pass through, and both ends of the reaction force component arranged opposite to each other along a second direction are provided with a drilling hole and the opening for the hydraulic loading column to pass through respectively;

[0006] The release drilling device has a hollow drill bit for drilling the strain measuring device installed in the test rock body, and the drilling hole is coaxially arranged with the hollow drill bit.

[0007] Optionally, the reaction force assembly includes a reaction force frame and a reaction force plate;

[0008] One end of the reaction frame is connected to the upper surface of the bearing platform, and the other end is connected to the reaction plate. One end of the reaction plate away from the reaction frame is connected to the bearing platform. The drilling hole is provided on the reaction plate, and the opening is provided on the end surface of the reaction frame away from the drilling hole.

[0009] Optionally, the reaction frame includes a fixing plate provided with the opening and a connecting beam for connecting the fixing plate and the reaction plate. The bearing platform is provided with a first insertion groove for inserting the fixing plate and a second insertion groove for inserting the reaction plate. The two ends of the bearing platform opposite to each other along the second direction are respectively provided with a first threaded hole and a second threaded hole. The fixing plate is provided with a first through hole corresponding to the first threaded hole, and the reaction plate is provided with a second through hole corresponding to the second threaded hole.

[0010] Optionally, the connecting beam includes a connecting rod and mounting parts fixed at both ends of the connecting rod;

[0011] The mounting part is provided with a clamping groove and a first through hole for a screw to pass through. The fixing plate and the reaction plate are both provided with second through holes corresponding to the first through hole.

[0012] The number of the connecting beams is two. The two connecting beams are arranged opposite to each other along the first direction and are both arranged between the fixing plate and the reaction plate.

[0013] Optionally, the placement position is configured as an open groove recessed in the upper surface of the bearing platform;

[0014] The two ends of the open groove opposite to each other along the second direction are respectively a channel port and a positioning side wall surface.

[0015] Optionally, it further includes a first force equalizing plate. The number of the first force equalizing plates is two, and the two first force equalizing plates are respectively arranged at the two ends of the open groove opposite to each other along the first direction.

[0016] Optionally, a support plate is fixedly connected to one end of the first force equalizing plate close to the open groove. The storage grooves for storing the support plate are provided on both side wall surfaces of the open groove opposite to each other along the first direction;

[0017] A second force equalizing plate is further provided between the positioning side wall surface and the test rock mass. A third force equalizing plate is placed on the upper surface of the test rock mass.

[0018] Optionally, it further includes a moving component;

[0019] The moving component includes a sliding table and a base. The sliding table is slidably connected to the base, and the release drilling device is installed on the upper surface of the sliding table.

[0020] Optionally, the drilling release device includes a mounting frame, a driving motor, a first transmission assembly, a driving rod, a second transmission assembly, a transmission rod, a diameter-changing joint, a core sleeve, and the hollow drill bit;

[0021] The output shaft of the driving motor is connected to the driving rod through the first transmission assembly, the driving rod is connected to the transmission rod through the second transmission assembly, a diameter-changing joint is connected to one end of the transmission rod away from the second transmission assembly, the diameter-changing joint is used to connect the core sleeve, and a hollow drill bit is connected to one end of the core sleeve away from the diameter-changing joint;

[0022] Bearing seats for fixing the driving rod and the transmission rod are provided on the mounting frame, an extension sleeve for supporting the core sleeve is also fixedly connected to the mounting frame, a ring sleeve is provided on the inner wall surface of the extension sleeve, the core sleeve passes through the ring sleeve, and a bearing is provided at the connection part between the core sleeve and the ring sleeve.

[0023] Optionally, the first transmission assembly includes a first pulley connected to the output shaft of the driving motor and a second pulley mounted on the driving rod, the first pulley and the second pulley are connected by a belt, and the second transmission assembly is configured as a CVT stepless speed change mechanism.

[0024] Through the above technical solutions, multiple hydraulic loading columns extend from multiple directions through the openings provided on the reaction force assembly to the inside of the reaction force assembly, and then abut against the test rock mass, so as to simulate the real three-dimensional in-situ stress environment as much as possible, making the data measured by the strain measurement device installed in the test rock mass closer to the real data. That is, after installing the strain measurement device in the test rock mass to ensure that it can obtain the strain on the hole wall, record the strain data as the initial strain data, and then continuously advance the drill bit at a slow speed or at equal intervals, and record the strain data in real time. After the strain data is relatively stable, record the data, and this strain data is the released strain data. At this time, the stress release operation is completed. Then, according to the measurement principle of the strain measurement device and relevant calculation methods, the relevant values of the preset three-dimensional stress level can be solved. This device well simulates the stress release technology of in-situ stress testing at the engineering site in the laboratory, improves the accuracy of the strain measurement device, and can provide a more accurate basis for on-site geotechnical engineering design according to the simulation calculation results in the laboratory, which helps personnel evaluate and predict the risks that may be caused by changes in in-situ stress and improves the safety of construction personnel.

[0025] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of the in-situ stress relief simulation test equipment provided in an exemplary embodiment of the present disclosure;

[0028] Figure 2 It is a front view structural schematic diagram of the stress simulation device provided in an exemplary embodiment of the present disclosure, where the connecting beam is not shown;

[0029] Figure 3 It is a side view structural schematic diagram of the stress simulation device provided in an exemplary embodiment of the present disclosure, where the connecting beam is not shown;

[0030] Figure 4 It is a structural schematic diagram of the reaction force component and the bearing platform provided in an exemplary embodiment of the present disclosure;

[0031] Figure 5 It is a structural schematic diagram of the bearing platform installed with the fixing plate and the reaction force plate provided in an exemplary embodiment of the present disclosure;

[0032] Figure 6 It is a structural schematic diagram of the bearing platform at one angle provided in an exemplary embodiment of the present disclosure;

[0033] Figure 7 It is a structural schematic diagram of the bearing platform installed with the first force equalizing plate provided in an exemplary embodiment of the present disclosure;

[0034] Figure 8 It is a structural schematic diagram of the first force equalizing plate provided in an exemplary embodiment of the present disclosure;

[0035] Figure 9 It is a structural schematic diagram of the connecting beam provided in an exemplary embodiment of the present disclosure;

[0036] Figure 10 It is a structural schematic diagram of the bearing platform at another angle provided in an exemplary embodiment of the present disclosure;

[0037] Figure 11 It is a structural schematic diagram of the fixing plate provided in an exemplary embodiment of the present disclosure;

[0038] Figure 12 It is a structural schematic diagram of the reaction force plate provided in an exemplary embodiment of the present disclosure.

[0039] Description of Reference Numerals

[0040] 1-carrying platform; 101-first plug-in slot; 102-second plug-in slot; 103-first threaded hole; 104-second threaded hole; 105-open slot; 1051-channel opening; 1052-positioning side wall; 1053-storage slot; 2-reaction frame; 201-fixing plate; 2011-first through hole; 202-connecting beam; 2021-connecting rod; 2022-mounting piece; 20221-clamping slot; 20222-first through hole; 3-reaction plate; 301-drilling hole; 302-second through hole; 4-drilling device release; 401-mounting frame; 40 2-driving motor; 403-first transmission assembly; 4031-first pulley; 4032-second pulley; 404-driving rod; 405-second transmission assembly; 406-transmission rod; 407-reducing joint; 408-core sleeve; 409-hollow drill bit; 410-extension sleeve; 411-ring; 5-second perforation; 6-first force equalizing plate; 601-support plate; 7-second force equalizing plate; 8-third force equalizing plate; 9-moving assembly; 901-slide; 902-base; 10-test rock mass; 11-hydraulic loading column; 12-strain measurement equipment. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0042] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] In the specific embodiment provided in the present disclosure, a rock stress relief simulation test equipment is provided, referring to Figures 1 to 10As shown in the figure, the original rock stress relief simulation test equipment includes a stress simulation device and a relief drilling device 4. Among them, the stress simulation device can simulate a more realistic three-dimensional in-situ stress environment for the test rock mass 10. That is, the stress simulation device includes a bearing platform 1 and a reaction force component installed on the bearing platform 1. The bearing platform 1 is provided with a placement position for placing the test rock mass 10. Both ends of the reaction force component arranged oppositely in the first direction are provided with openings through which the hydraulic loading columns 11 pass. The two hydraulic loading columns 11 extend from the opposite sides in the first direction through the openings to the inside of the reaction force component and apply pressure to the test rock mass 10. One end of the reaction force component facing away from the placement position is provided with an opening through which the hydraulic loading column 11 passes. That is, there is a hydraulic loading column 11 above the placement position. The hydraulic loading column 11 extends through the opening to the inside of the reaction force component and applies pressure to the test rock mass 10 from above the test rock mass 10 towards the placement position. And at this time, the placement position will give the test rock mass 10 a reaction force upwards. Both ends of the reaction force component arranged oppositely in the second direction are respectively provided with a drilling hole 301 and an opening through which the hydraulic loading column 11 passes. That is, one end of the reaction force component facing the relief drilling device 4 should be provided with a drilling hole 301 through which the hollow drill bit 409 extends to the inside of the reaction force component, so as to ensure that the hollow drill bit 409 can drill out the strain measurement device 12 installed in the test rock mass 10. Therefore, at the end of the reaction force component provided with the drilling hole 301, a hydraulic loading column 11 for applying pressure to the test rock mass 10 cannot be provided, and a travel path needs to be reserved for the movement of the hollow drill bit 409. At the same time, an opening through which the hydraulic loading column 11 passes can be provided at the end of the reaction force component facing away from the drilling hole 301. Refer to Figure 1 , the hydraulic loading column 11 can be understood as applying pressure to the test rock mass 10 from its back. At the same time, when the hydraulic loading column 11 located at the back of the test rock mass 10 applies pressure to it, the reaction force component can give the test rock mass 10 an opposite reaction force. Based on this, refer to Figure 1 and Figure 2As shown, four hydraulic loading columns 11 apply pressure to the test rock mass 10 from above, left, right, and rear of the test rock mass 10 respectively, and a reaction force is applied to the test rock mass 10 through the bearing platform 1 and the reaction force assembly, so as to achieve the purpose of more realistically simulating the three-dimensional in-situ stress environment, improve the accuracy of the relevant data obtained by measurement, reduce the data error as much as possible, and provide a more accurate basis for geotechnical engineering design. At the same time, the relief drilling device 4 has a hollow drill bit 409 for drilling the strain measurement device 12 installed in the test rock mass 10, that is, the strain measurement device 12 is installed inside the test rock mass 10. The strain measurement device 12 includes a hollow inclusion strain gauge or a piezomagnetic sensor. The relevant strain data is measured by the strain measurement device 12. Based on the relevant strain data, and then through the measurement principle of the strain measurement device 12 and relevant calculation methods, the relevant values of the in-situ stress are solved, so that researchers and engineers can more accurately understand and predict the behavior of rocks and soils underground, thereby providing an important scientific basis for the design and construction of geotechnical engineering.

[0044] Through the above technical solution, multiple hydraulic loading columns 11 extend from multiple directions through the openings provided on the reaction force assembly to the inside of the reaction force assembly, and then abut against the test rock mass 10, so as to simulate the real three-dimensional in-situ stress environment as much as possible, making the data measured by the strain measurement device 12 installed in the test rock mass 10 closer to the real data. That is, before the strain measurement device 12 installed in the test rock mass 10 is drilled out by the relief drilling device 4, the strain data needs to be recorded. The strain data recorded at this time is the initial strain data. After the relief operation is completed and the strain data is relatively stable, the data is recorded. This strain data is the relief strain data. Then, according to the measurement principle of the strain measurement device 12 and relevant calculation methods, the relevant values of the in-situ stress can be solved. The relevant values of the in-situ stress can provide a more accurate basis for geotechnical engineering design, help personnel evaluate and predict the risks that may be caused by changes in in-situ stress, and improve the safety of construction personnel.

[0045] In the present disclosure, the first direction can refer to Figure 4 the X direction in Figure 4 and the second direction can refer to the Y direction in

[0046] Figures 4 to 10As shown, the reaction force assembly includes a reaction frame 2 and a reaction plate 3, wherein one end of the reaction frame 2 is connected to the upper surface of the bearing platform 1, and the other end is connected to the reaction plate 3, the end of the reaction plate 3 away from the reaction frame 2 is connected to the bearing platform 1, a drilling hole 301 is provided on the reaction plate 3, and an opening is provided on the end surface of the reaction frame 2 away from the drilling hole 301, that is, when the hydraulic loading column 11 located on the back of the test rock mass 10 applies pressure to the test rock mass 10, the hydraulic loading column 11 extends to the inner side of the reaction frame 2 through the opening provided on the reaction frame 2 and then abuts against the test rock mass 10, so that the reaction plate 3 and the test rock mass 10 abut against each other and apply a reaction force to them.

[0047] In some embodiments, reference Figures 4 to 10 As shown, the reaction frame 2 includes two parts, namely, a fixed plate 201 with an opening and a connecting beam 202 for connecting the fixed plate 201 and the reaction plate 3. The fixed plate 201 and the connecting beam 202 are detachably connected, which is convenient for personnel to classify and store the fixed plate 201 and the connecting beam 202. When there is no need to perform measurement operations, the reaction frame 2 can be removed from the supporting platform 1 and the fixed plate 201 can be separated from the connecting beam 202, which can significantly save storage space, especially when the laboratory space is limited;

[0048] In some embodiments, reference Figures 4 to 10 As shown, the support platform 1 is provided with a first plugging slot 101 for the fixing plate 201 to be plugged in and a second plugging slot 102 for the reaction plate 3 to be plugged in. The fixing plate 201 and the reaction plate 3 are installed on the support platform 1 by plugging. In order to ensure that the fixing plate 201 and the reaction plate 3 can be firmly installed on the support platform 1, a first threaded hole 103 and a second threaded hole 104 are respectively provided at two ends of the support platform 1 that are arranged opposite to each other along the second direction. The fixing plate 201 is provided with a first through hole 2011 corresponding to the first threaded hole 103, and the reaction plate 3 is provided with a The second through hole 302 corresponding to the second threaded hole 104, that is, when the fixing plate 201 is plugged into the first plug-in slot 101, the first through hole 2011 provided on the fixing plate 201 is coaxial with the first threaded hole 103, and at this time, it is fixed by bolts so that the fixing plate 201 is firmly connected to the supporting platform 1; when the reaction plate 3 is plugged into the second plug-in slot 102, the second through hole 302 provided on the reaction plate 3 is coaxial with the second threaded hole 104, and at this time, it is fixed by bolts so that the reaction plate 3 is firmly connected to the supporting platform 1.

[0049] In some embodiments not shown, the connecting beam 202 includes a connecting column, an external thread for threadedly connecting a nut is provided on the outer wall surface of the connecting column, the connecting column is arranged between the fixing plate 201 and the reaction plate 3, and through holes for the connecting column to pass through are provided on both the fixing plate 201 and the reaction plate 3. Four nuts are connected to each connecting column, and two nuts are in a group to clamp and fix the fixing plate 201 and the reaction plate 3. At the same time, in order to ensure the stable connection of the nuts, washers can be sleeved on the connecting column, and at least one washer corresponds to each nut.

[0050] In some embodiments, referring to Figures 4 to 12 As shown, the connecting beam 202 includes a connecting rod 2021 and mounting members 2022 fixedly connected to both ends of the connecting rod 2021. A clamping groove 20221 and a first through hole 20222 for a screw rod to pass through are provided on the mounting member 2022. Second through holes 5 corresponding to the first through hole 20222 are provided on both the fixing plate 201 and the reaction plate 3. That is, during installation, the two mounting members 2022 located at both ends of the connecting rod 2021 should be respectively aligned with the fixing plate 201 and the reaction plate 3 first, so that the clamping groove 20221 on the mounting member 2022 can be inserted into the fixing plate 201 and the reaction plate 3. After the insertion is completed, the second through holes 5 on the fixing plate 201 and the second through holes 5 on the reaction plate 3 are respectively coaxial with the first through hole 20222 of the corresponding mounting member 2022, and then they are fixedly connected by passing a screw rod through and using nuts.

[0051] In some embodiments, the clamping groove 20221 can effectively increase the contact area between the mounting member 2022 and the fixing plate 201 and the reaction plate 3, and thus effectively increase the connection strength between the connecting beam 202 and the fixing plate 201 and the reaction plate 3, so that the reaction plate 3 can better give a reaction force to the test rock mass 10, ensuring that a more realistic three-dimensional stress environment simulation can be given to the test rock mass 10.

[0052] In some embodiments, the number of the connecting beams 202 is two. The two connecting beams 202 are arranged oppositely along the first direction and both are arranged between the fixing plate 201 and the reaction plate 3. The fixing plate 201, the reaction plate 3 and the two connecting beams 202 enclose an opening, so that the hydraulic loading column 11 located above the test rock mass 10 can extend from the opening to the inside of the reaction assembly to apply pressure to the test rock mass 10.

[0053] In some embodiments, referring to Figure 6 and Figure 10As shown, the placement position is configured as an open slot 105 recessed in the upper surface of the bearing table 1. Among them, the two ends of the open slot 105 opposite to each other along the second direction are respectively a channel opening 1051 and a positioning side wall surface 1052. The setting of the channel opening 1051 facilitates the operator to move the test rock mass 10 into the open slot 105. In order to ensure that the test rock mass 10 can be more effectively pressed by multiple hydraulic loading columns 11, it is necessary to place the test rock mass 10 placed on the upper surface of the open slot 105 in a proper position. Considering improving the working efficiency and placement accuracy when placing the test rock mass 10, the positioning side wall surface 1052 is used to position the test rock mass 10. That is, during the process of moving the test rock mass 10, the test rock mass 10 can be directly abutted against the positioning side wall surface 1052. And in order to further improve the placement accuracy, two marking lines can be marked on the positioning side wall surface 1052 according to the size of the test rock mass 10 itself. When placing, the test rock mass 10 should be located between the two marking lines.

[0054] In some embodiments, referring to Figure 7 and Figure 8 As shown, in order to enable the hydraulic loading columns 11 to apply pressure to the test rock mass 10 more evenly, it can be implemented through the first force equalizing plate 6. That is, the number of the first force equalizing plates 6 is two, and the two first force equalizing plates 6 are respectively arranged at the two ends of the open slot 105 opposite to each other along the first direction. The two hydraulic loading columns 11 opposite to each other along the first direction of the test rock mass 10 respectively abut against the test rock mass 10 through the corresponding first force equalizing plates 6. The first force equalizing plate 6 can evenly transfer the force applied from the hydraulic loading column 11 to the entire contact surface of the test rock mass 10, thus avoiding local stress concentration.

[0055] In some embodiments, referring to Figure 7 and Figure 8As shown, the first force equalizing plate 6 can effectively transfer the force applied by the hydraulic loading column 11 uniformly to the entire contact surface of the test rock mass 10, thereby improving the accuracy of the data measured by the strain measuring device 12 and making the test results more reliable. At the same time, the first force equalizing plate 6 can also protect the test rock mass 10 from direct high-pressure impacts and reduce the damage of the rock mass caused by uneven pressure. Therefore, before simulating the three-dimensional in-situ stress environment through the hydraulic loading column 11, the first force equalizing plate 6 needs to be in a proper position to ensure that it can uniformly transfer the force applied by the hydraulic loading column 11 to the entire contact surface of the test rock mass 10 and avoid affecting the accuracy of the test results. Based on this, considering labor saving and improving operation safety, a support plate 601 is fixedly connected to one end of the first force equalizing plate 6 close to the open slot 105, and the included angle between the connection part of the support plate 601 and the first force equalizing plate 6 is 90°. Through the support plate 601, the first force equalizing plate 6 can be erected on the upper surface of the open slot 105. Before the hydraulic loading column 11 applies pressure to the test rock mass 10, by adjusting the placement position of the support plate 601, the position of the first force equalizing plate 6 can be adjusted. The correct placement position can ensure that the pressure applied to the test rock mass 10 is evenly distributed, making the measured data more reliable and facilitating subsequent data interpretation and analysis, and improving the accuracy of the test results.

[0056] In some embodiments, referring to Figures 6 to 8 As shown, receiving grooves 1053 for receiving the support plate 601 are provided on both side walls of the open slot 105 oppositely arranged in the first direction. That is, before simulating the three-dimensional in-situ stress environment through the hydraulic loading column 11, the first force equalizing plate 6 can be first arranged on the upper surface of the open slot 105. Among them, in order to enable the first force equalizing plate 6 to be stably placed in the open slot 105, the support plate 601 fixedly connected to the first force equalizing plate 6 can be inserted into the receiving groove 1053, and the receiving groove 1053 is used to limit the support plate 601, so that the first force equalizing plate 6 is erected on the upper surface of the open slot 105.

[0057] In some embodiments, referring to Figure 2 and Figure 3 As shown, in the present application, a second force equalizing plate 7 and a third force equalizing plate 8 are also provided. Among them, the second force equalizing plate 7 is arranged between the positioning side wall surface 1052 and the test rock mass 10, and the second force equalizing plate 7 corresponds to the hydraulic loading column 11 located at the back of the test rock mass 10. The second force equalizing plate 7 enables the hydraulic loading column 11 located at the back of the test rock mass 10 to apply pressure to the test rock mass 10 more evenly; the third force equalizing plate 8 is placed on the upper surface of the test rock mass 10 and thus corresponds to the hydraulic loading column 11 located above the test rock mass 10. The third force equalizing plate 8 enables the hydraulic loading column 11 located above the test rock mass 10 to apply pressure to the test rock mass 10 more evenly.

[0058] In some embodiments, referring to Figure 1 as shown, it further includes a moving component 9. The moving component 9 includes a sliding table 901 and a base 902. The sliding table 901 is slidably connected to the base 902. The releasing drilling device 4 is mounted on the upper surface of the sliding table 901. That is, the sliding table 901 can drive the releasing drilling device 4 to move along the length direction of the base 902, so that the hollow drill bit 409 can extend to the inside of the reaction force component through the drilling hole 301 and then contact the test rock mass 10, thereby drilling and extracting the strain measurement device 12 installed in the test rock mass 10.

[0059] In some embodiments not shown, a slide rail is fixedly connected to the base 902. A slider matching the slide rail is provided at the bottom of the sliding table 901. A driving device for driving the movement of the base 902 is mounted on the base 902. The driving device can be a cylinder or a hydraulic cylinder. The output end of the driving device is connected to the sliding table 901.

[0060] In some embodiments not shown, the sliding table 901 and the base 902 can be selected as a ball screw sliding table 901. That is, two support shaft seats are mounted on the base 902. The screw shaft is installed between the support shaft seats. One end of the screw shaft is connected to the output shaft of the motor through a coupling. A screw nut is mounted on the screw shaft. The sliding table 901 is detachably connected to the screw nut. A guide rail is further provided on the base 902. A guide rail block matching the guide rail is provided on the lower surface of the sliding table 901. By driving the screw shaft to rotate by the driving motor 402, the screw nut can linearly move along the length direction of the screw shaft. By controlling the positive and negative rotation of the output shaft of the motor, the screw nut can reciprocally move along the length direction of the screw shaft. When the screw nut moves, it can synchronously drive the sliding table 901 to move, thereby realizing the movement of the releasing drilling device 4, and thus drilling and extracting the strain measurement device 12 installed in the test rock mass 10.

[0061] In some embodiments, referring to Figure 1As shown, the core removal drilling device 4 includes a mounting frame 401, a drive motor 402, a first transmission assembly 403, a drive rod 404, a second transmission assembly 405, a transmission rod 406, a variable diameter joint 407, a core barrel 408, and a hollow drill bit 409. Among them, the output shaft of the drive motor 402 is connected to the drive rod 404 through the first transmission assembly 403, and the drive rod 404 is connected to the transmission rod 406 through the second transmission assembly 405. One end of the transmission rod 406 away from the second transmission assembly 405 is connected to the variable diameter joint 407, and the variable diameter joint 407 is used to connect the core barrel 408. One end of the core barrel 408 away from the variable diameter joint 407 is connected to the hollow drill bit 409. That is, the rotation of the output shaft of the drive motor 402 can make the drive rod 404 rotate through the transmission of the first transmission assembly 403. When the drive rod 404 rotates, the drive rod 404 can make the transmission rod 406 rotate through the second transmission assembly 405. One end of the transmission rod is connected to the core barrel 408 and the hollow drill bit 409 through the variable diameter joint 407. Therefore, the transmission rod 406 can drive the core barrel 408 and the hollow drill bit 409 to rotate. When it is necessary to remove the strain measurement device 12 installed in the test rock mass 10, the moving assembly 9 can be started, so that the sliding table 901 drives the entire core removal drilling device 4 to move, so that the hollow drill bit 409 can contact the test rock mass 10 through the drilling hole 301 and start the drilling operation. The removed strain measurement device 12 and a part of the rock mass wrapped outside the strain measurement device 12 are located in the core barrel 408.

[0062] In some embodiments, a control panel can be provided on the mounting frame 401. Among them, the control panel is provided with an on / off key for controlling the start or stop of the core removal drilling device 4 or a control button for controlling the rotation speed of the hollow drill bit 409 and other control buttons for related components.

[0063] In some embodiments, referring to Figure 1 As shown, in order to enable the drive rod 404 and the transmission rod 406 to rotate stably, bearing seats for fixing the drive rod 404 and the transmission rod 406 can be provided on the mounting frame 401. At the same time, in order to enable the core barrel 408 to rotate stably, an extension sleeve 410 for supporting the core barrel 408 is fixedly connected to the mounting frame 401. A ring sleeve 411 is provided on the inner wall surface of the extension sleeve 410. The core barrel 408 passes through the ring sleeve 411 and a bearing is provided at the connection part between the core barrel 408 and the ring sleeve 411. That is, the extension sleeve 410 and the ring sleeve 411 play a supporting role for the core barrel 408, and the bearing provided at the connection part between the core barrel 408 and the ring sleeve 411 can reduce the friction between the ring sleeve and the core barrel 408, so that the core barrel 408 can rotate more smoothly.

[0064] In some embodiments, referring to Figure 1As shown, the first transmission assembly 403 includes a first pulley 4031 connected to the output shaft of the drive motor 402 and a second pulley 4032 mounted on the drive rod 404, and the first pulley 4031 and the second pulley 4032 are connected by a belt.

[0065] In some embodiments not shown, the first transmission assembly 403 includes a first sprocket connected to the output shaft of the drive motor 402 and a second sprocket mounted on the drive rod 404, and the first sprocket and the second sprocket are connected by a chain.

[0066] Similarly, the second transmission assembly 405 can also be a belt drive or a chain drive.

[0067] In some embodiments, referring to Figure 1 As shown, the second transmission assembly 405 is configured as a CVT stepless speed change mechanism. That is, when truly reproducing the downhole in-situ stress test work in the laboratory, many factors such as the drilling speed when the hollow drill bit 409 drills the strain measurement device 12 and the rotation speed of the hollow drill bit 409 may cause errors in the measured relevant values compared with the true values. In order to reduce the error value, the CVT stepless speed change mechanism can be used to overcome the problem that the rotation speed of the hollow drill bit 409 decreases due to resistance when the hollow drill bit 409 contacts the test rock mass 10, and ensure that the entire drilling process is more stable as much as possible. Among them, variable diameter gears are provided on both the drive rod 404 and the transmission rod 406, and the two variable diameter gears are connected by a steel belt drive. At the same time, a hydraulic component (the hydraulic component includes a hydraulic pump, a hydraulic cylinder and a control valve. Among them, the hydraulic pump provides hydraulic power and transports hydraulic oil into the hydraulic cylinder of the variable diameter gear; the hydraulic cylinder is connected to the variable diameter gear and pushes or pulls the gear through the pressure of the hydraulic oil to change its diameter; the control valve is used to adjust the flow direction and pressure of the hydraulic oil to precisely control the diameter change of the variable diameter gear.) can be installed on the upper surface of the slide table 901 to facilitate the control and adjustment of the variable diameter gear.

[0068] In some embodiments, when the hollow drill bit 409 drills the strain measurement device 12, in order to prevent the surrounding rock from cracking due to excessive temperature during drilling, a water spraying and cooling device can be provided. Among them, the water spray pipe of the water spraying and cooling device is aligned with the drilling part to reduce the temperature during drilling.

[0069] Device Usage Instructions: Before the test, the test rock mass 10 needs to be placed on the upper surface of the open trough 105, and the first force equalizing plate 6, the second force equalizing plate 7, and the third force equalizing plate 8 are placed in appropriate positions in sequence. Then, the reaction force assembly is installed. That is, after the fixing plate 201 and the reaction force plate 3 are respectively inserted into the first insertion slot 101 and the second insertion slot 102, the fixing plate 201 and the reaction force plate 3 are fixed by bolts. Then, the connecting beam 202 is installed between the fixing plate 201 and the reaction force plate 3. The fixing plate 201 and the reaction force plate 3 partially overlap through the clamping slot 20221 and the mounting member 2022 to increase the connection strength. Before the drilling operation, it is necessary to ensure that the hollow drill bit 409 can contact the test rock mass 10 through the drilling hole 301 on the reaction force plate 3, and then perform the drilling operation on the strain measurement device 12 installed inside it.

[0070] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. There are many other variations in different aspects of the present invention as described above, and they are not provided in detail for the sake of brevity.

[0071] Embodiments of the present invention are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An in-situ rock stress relief simulation test equipment, characterized in that: include: A stress simulation device comprises a bearing platform (1) and a reaction force component mounted on the bearing platform (1), wherein a placement position for placing a test rock mass (10) is provided on the bearing platform (1), openings for a hydraulic loading column (11) to pass through are provided at two opposite ends of the reaction force component arranged along a first direction, the opening for the hydraulic loading column (11) to pass through is provided at one end of the reaction force component away from the placement position, and a drilling hole (301) and the opening for the hydraulic loading column (11) to pass through are provided at two opposite ends of the reaction force component arranged along a second direction; The release drilling device (4) has a hollow drill bit (409) for drilling a strain measuring device (12) installed in the test rock mass (10), and the drilling hole (301) is coaxially arranged with the hollow drill bit (409).

2. The in-situ rock stress relief simulation test equipment according to claim 1, characterized in that: The reaction force assembly comprises a reaction force frame (2) and a reaction force plate (3); One end of the reaction frame (2) is connected to the upper surface of the bearing platform (1), and the other end is connected to the reaction plate (3); the end of the reaction plate (3) facing away from the reaction frame (2) is connected to the bearing platform (1); the reaction plate (3) is provided with the drilling hole (301); and the end surface of the reaction frame (2) facing away from the drilling hole (301) is provided with the opening.

3. The in-situ rock stress relief simulation test equipment according to claim 2, characterized in that: The reaction frame (2) comprises a fixing plate (201) provided with the opening and a connecting beam (202) for connecting the fixing plate (201) and the reaction plate (3); the bearing platform (1) is provided with a first plug-in slot (101) for plugging the fixing plate (201) and a second plug-in slot (102) for plugging the reaction plate (3); two ends of the bearing platform (1) arranged opposite to each other along the second direction are respectively provided with a first threaded hole (103) and a second threaded hole (104); the fixing plate (201) is provided with a first through hole (2011) corresponding to the first threaded hole (103); and the reaction plate (3) is provided with a second through hole (302) corresponding to the second threaded hole (104).

4. The in-situ rock stress relief simulation test equipment according to claim 3, characterized in that: The connecting beam (202) comprises a connecting rod (2021) and mounting parts (2022) fixedly connected to both ends of the connecting rod (2021); The mounting member (2022) is provided with a snap-fitting groove (20221) and a first through hole (20222) for the screw to pass through, and the fixing plate (201) and the reaction plate (3) are both provided with a second through hole (5) corresponding to the first through hole (20222); The number of the connecting beams (202) is two, the two connecting beams (202) are arranged opposite to each other along a first direction, and the two connecting beams (202) are both arranged between the fixing plate (201) and the reaction plate (3).

5. The in-situ rock stress relief simulation test equipment according to claim 1, characterized in that: The placement position is structured as an open groove (105) sunken into the upper surface of the support platform (1); Two opposite ends of the open groove (105) arranged along the second direction are respectively a channel opening (1051) and a positioning side wall surface (1052).

6. The in-situ rock stress relief simulation test equipment according to claim 5, characterized in that: It also includes a first force equalizing plate (6), the number of the first force equalizing plates (6) is two, and the two first force equalizing plates (6) are respectively arranged at two ends of the open groove (105) that are arranged opposite to each other along the first direction.

7. The in-situ rock stress relief simulation test equipment according to claim 6, characterized in that: A support plate (601) is fixedly connected to one end of the first force equalizing plate (6) close to the open groove (105), and receiving grooves (1053) for receiving the support plate (601) are provided on two side walls of the open groove (105) arranged opposite to each other along the first direction; A second force equalizing plate (7) is also provided between the positioning side wall surface (1052) and the test rock mass (10), and a third force equalizing plate (8) is placed on the upper surface of the test rock mass (10).

8. The in-situ rock stress relief simulation test equipment according to claim 1, characterized in that: Also includes a moving component (9); The moving assembly (9) comprises a slide (901) and a base (902), wherein the slide (901) is slidably connected to the base (902), and the release drilling device (4) is installed on the upper surface of the slide (901).

9. The in-situ rock stress relief simulation test equipment according to claim 8, characterized in that: The release drilling device (4) comprises a mounting frame (401), a drive motor (402), a first transmission assembly (403), a drive rod (404), a second transmission assembly (405), a transmission rod (406), a reducer (407), a core sleeve (408) and the hollow drill bit (409); The output shaft of the driving motor (402) is connected to the driving rod (404) via the first transmission assembly (403), the driving rod (404) is connected to the transmission rod (406) via the second transmission assembly (405), the end of the transmission rod (406) away from the second transmission assembly (405) is connected to the reducer (407), the reducer (407) is used to connect to the core sleeve (408), and the end of the core sleeve (408) away from the reducer (407) is connected to the hollow drill bit (409); The mounting frame (401) is provided with a bearing seat for fixing the driving rod (404) and the transmission rod (406); the mounting frame (401) is also fixedly connected with an extension sleeve (410) for supporting the core sleeve (408); a ring sleeve (411) is provided on the inner wall surface of the extension sleeve (410); the core sleeve (408) is penetrated by the ring sleeve (411), and a bearing is provided at the connection portion between the core sleeve (408) and the ring sleeve (411).

10. The in-situ rock stress relief simulation test equipment according to claim 9, characterized in that: The first transmission assembly (403) includes a first pulley (4031) connected to the output shaft of the driving motor (402) and a second pulley (4032) installed on the driving rod (404), the first pulley (4031) and the second pulley (4032) are connected by a belt, and the second transmission assembly (405) is constructed as a CVT continuously variable transmission mechanism.

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