Rock dynamic and static tension and compression multi-field coupling test device

Abstract

The invention discloses a rock dynamic and static tension and compression multi-field coupling test device, and relates to the technical field of rock dynamic load, static load, tension and compression, shearing, rheology, temperature, seepage, chemistry, ultrasonic wave, acoustic emission, resistivity and other multi-field coupling tests. The device comprises a counter-force frame, a dynamic / static force loading system and a sample base, the dynamic / static loading system comprises an axial dynamic / static loading oil cylinder fixed on the inner wall of the top plate of the counter-force frame, an axial dowel bar, a dowel bar sealing barrel and a confining pressure chamber structure; the sample is arranged at the top of the sample base; the confining pressure chamber structure comprises a confining pressure chamber lifting rod groove and a confining pressure chamber lifting rod. In the triaxial tensile test process, the end part of the test sample does not need to be glued, the test sample adopts a dumbbell-shaped test sample shape design, the axial tensile force is provided by using a confining pressure loading system and adopting confining pressure, and the axial tensile test of the rock under different confining pressure conditions can be realized.

Description

Technical Field

[0001] This invention relates to the field of multi-field coupling test technology for rocks, including dynamic load, static load, tension and compression, shear, rheology, temperature, seepage, chemical, ultrasonic, acoustic emission, resistivity and other fields. More specifically, it is a multi-field coupling test device for rocks under dynamic and static tension and compression. Background Technology

[0002] Triaxial rock testing is an important tool for studying rock mechanics. Triaxial rock test data is an important parameter in rock mechanics, which can simulate the mechanical properties of soil and rock under original in-situ stress conditions relatively completely and is an important basis for engineering design. With the increasing number of deep rock mass engineering projects in my country, the engineering geological problems faced are becoming more and more complex, including challenges such as high in-situ stress, high ground temperature, and high groundwater levels. Therefore, how to simulate mechanical tests under different environmental conditions in the laboratory is a key scientific issue in rock mechanics.

[0003] Existing triaxial rock testing equipment can mainly perform uniaxial compression, conventional triaxial compression, dynamic impact, and rheological tests, but lacks tensile testing under confining pressure, and especially lacks triaxial testing devices and methods that simultaneously consider multiple fields such as dynamic load, static load, tension and compression, shear, rheology, temperature, seepage, chemical, ultrasonic, acoustic emission, and resistivity.

[0004] Therefore, it is necessary to develop a multi-functional, multi-field coupled rock mechanics test system that is highly integrated, multifunctional, widely applicable, easy to operate, occupies little space, has low cost, and whose test methods are more in line with engineering. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and to provide a multi-field coupled test device for dynamic and static tension and compression of rocks.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a multi-field coupled test device for dynamic and static tension and compression of rocks, characterized in that: it includes a reaction frame, a dynamic / static loading system, and a sample base; both the dynamic / static loading system and the sample base are located within the reaction frame, the dynamic / static loading system is located above the sample base, and the dynamic / static loading system includes an axial dynamic / static loading cylinder fixed to the inner wall of the top plate of the reaction frame, an axial force transmission rod fixedly connected to the output end of the axial dynamic / static loading cylinder, a force transmission rod sealing barrel enclosing the axial force transmission rod, and a confining pressure chamber structure;

[0007] The sample base is stepped, and the sample is placed on top of the sample base.

[0008] The confining pressure chamber structure comprises a confining pressure chamber lifting rod slot arranged on the inner wall of the side plate of the counterforce frame, and a confining pressure chamber lifting rod having one end slidably connected to the confining pressure chamber lifting rod slot and the other end fixedly connected to the confining pressure cavity.

[0009] In the above technical solution, the confining pressure chamber structure further comprises a signal line box arranged inside the counterforce frame and below the sample base.

[0010] In the above technical solution, the sample has a dumbbell shape with the diameters of the upper and lower ends greater than the diameter of the middle part.

[0011] In the above technical solution, a temperature testing system is further included, which comprises a heating and insulation device and a temperature control system. When the confining pressure chamber lifting rod slides down along the confining pressure chamber lifting rod slot and falls on the step of the sample base, the heating and insulation device is arranged outside the confining pressure cavity and the force transmission rod sealing barrel. The temperature control system is arranged outside the counterforce frame, and the temperature control system is connected to the heating and insulation device through a first lead wire.

[0012] In the above technical solution, an ultrasonic testing system is further arranged outside the counterforce frame. An ultrasonic wave emission probe signal line slot is formed in the axial force transmission rod, and an ultrasonic wave emission probe slot is arranged at the top of the ultrasonic wave emission probe signal line slot. An ultrasonic wave receiving probe signal line slot is formed in the sample base, and an ultrasonic wave receiving probe slot is arranged at the top of the ultrasonic wave receiving probe signal line slot.

[0013] The ultrasonic testing system is connected to the ultrasonic wave emission probe arranged in the ultrasonic wave emission probe slot through the ultrasonic wave emission probe signal line slot, and connected to the ultrasonic wave receiving probe arranged in the ultrasonic wave receiving probe slot through the ultrasonic wave receiving probe signal line slot.

[0014] In the above technical solution, an acoustic emission testing system is further arranged outside the counterforce frame. The acoustic emission testing system is connected to a plurality of acoustic emission probes arranged on the side of the sample through acoustic emission signal lead wires.

[0015] In the above technical solution, a resistivity testing system is further arranged outside the counterforce frame. Lead wire slots are formed in both sides of the sample base. The resistivity testing system is connected to an upper electrode arranged at the upper end of the sample through a second lead wire passing through the lead wire slot, and connected to a lower electrode arranged at the lower end of the sample through the second lead wire passing through the lead wire slot.

[0016] In the above technical solution, a seepage measurement system is further included, the seepage measurement system includes a gas seepage system and a liquid seepage system, and the sample base is provided with a gas / liquid seepage outlet on one side and a gas / liquid seepage inlet on the other side.

[0017] The gas seepage system includes a gas seepage control system, a gas inlet pipe connected to the gas seepage control system at one end and connected to the lower end of the sample through the gas / liquid seepage inlet at the other end, and an exhaust pipe connected to the upper end of the sample at one end and extending out of the dynamic / static force loading system through the gas / liquid seepage outlet at the other end; the gas inlet pipe is provided with a gas inlet cutoff valve; the exhaust pipe is provided with a gas outlet cutoff valve, a gas pressure gauge and a gas flow gauge;

[0018] The liquid seepage system includes a liquid seepage control system, a liquid inlet pipe connected to the liquid seepage control system at one end and connected to the lower end of the sample through the gas / liquid seepage inlet at the other end, and a liquid outlet pipe connected to the upper end of the sample at one end and connected to a liquid collection container through the gas / liquid seepage outlet at the other end; the liquid inlet pipe is provided with an upstream liquid pressure gauge, an upstream liquid flow gauge and an upstream liquid cutoff valve; the liquid outlet pipe is provided with a downstream liquid cutoff valve, a downstream liquid pressure gauge and a downstream liquid flow gauge.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] 1) In the triaxial tensile test process, the sample end does not need to be coated with glue, the sample adopts a dumbbell-shaped sample shape design, the confining pressure loading system is used, the confining pressure provides axial tension, and axial tensile test of rock under different confining pressures can be realized.

[0021] 2) The present application innovatively designs a heat-shrinkable sleeve self-adaptive fitting method, which is particularly used in triaxial tensile test. The sample and the end face of the pressure head are automatically lifted to realize glue-free sealing, and the hydraulic oil is effectively blocked. This technology breaks through the limitation of traditional triaxial tensile test that the end face needs to be coated with glue, significantly improves the experimental efficiency and operation convenience, and is especially suitable for axial tensile test under complex stress state. The traditional glue coating process needs a long time for solidification of the glue layer in a single test, while the confining pressure cavity of the present application realizes rapid clamping through mechanical linkage, and the sample preparation time is shortened to a few minutes, which significantly improves the test efficiency.

[0022] 3) The present application uses the dynamic / static force loading system on the reaction frame to realize axial tensile and compressive dynamic loading test of rock under confining pressure.

[0023] 4) The present application uses a dynamic / static force loading system, temperature, seepage, ultrasonic wave, acoustic emission and resistivity testing system to realize temperature-seepage-mechanics-chemistry (THMC) multi-field coupling tensile test and axial dynamic loading test, and meanwhile, high temperature and high pressure shear seepage test, ultrasonic wave test, acoustic emission test, resistivity test, rheological test can be carried out, and the functionality of the equipment is improved;

[0024] 5) The present application is a rock mechanics multifunctional multi-field coupling test system with wider applicability, more functions, simpler operation and more engineering-compliant test mode. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a sample loading schematic diagram of the present application.

[0026] Figure 2 It is a working state schematic diagram of the present application.

[0027] Figure 3 It is a temperature testing system schematic diagram of the present application.

[0028] Figure 4 It is a gas permeation testing system schematic diagram of the present application.

[0029] Figure 5 It is a liquid seepage testing system schematic diagram of the present application.

[0030] Figure 6 It is an ultrasonic wave testing system schematic diagram of the present application.

[0031] Figure 7 It is a resistivity testing system schematic diagram of the present application.

[0032] Figure 8 It is an acoustic emission testing system schematic diagram of the present application.

[0033] Figure 9 It is a sample schematic diagram of the present application.

[0034] Figure 10 It is a top view schematic diagram of the sample.

[0035] Figure 11 It is a triaxial tensile test axial deviatoric stress result graph under different confining pressures in Example 1.

[0036] Figure 12 It is a triaxial tensile test axial stress result graph under different confining pressures in Example 1.

[0037] Figure 13 It is a schematic diagram of loading confining pressure on the sample to generate upward and downward tensile stress.

[0038] 100-Counterforce frame, 200-Dynamic / static loading system, 210-Axial dynamic / static loading cylinder, 220-Axial force transmission rod, 230-Force transmission rod sealing barrel, 240-Confined pressure chamber structure, 241-Confined pressure chamber lifting rod groove, 242-Confined pressure chamber lifting rod, 243-Confined pressure cavity, 244-Signal line box, 300-Sample base, 310-Sample, 311-Sample thermoplastic sleeve, 312-Sample upper end fastening ring, 313-Sample lower end fastening ring, 314-Sample upper end seepage port, 315-Sample lower end seepage port, 316-Top semicircular rubber pad, 317-Top pad, 318-Bottom pad, 319-Bottom semicircular rubber pad, 400-Temperature testing system, 410-Heating and insulation device, 420-Temperature control system, 421-First wire, 500-Ultrasonic testing system, 510-Ultrasonic wave transmitting probe signal line groove, 511-Ultrasonic wave transmitting probe groove, 520-Ultrasonic wave receiving probe signal line groove, 521-Ultrasonic wave receiving probe groove, 530-Ultrasonic wave transmitting probe, 540-Ultrasonic wave receiving probe, 600-Acoustic emission testing system, 610-Acoustic emission signal wire, 620-Acoustic emission probe, 700-Resistivity testing system, 710-Wire groove, 720-Second wire, 730-Upper electrode, 740-Lower electrode, 800-Seepage measurement system, 810-Gas seepage system, 811-Gas seepage control system, 812-Gas inlet pipe, 813-Gas outlet pipe, 814-Gas inlet cutoff valve, 815-Gas outlet cutoff valve, 816-Gas pressure gauge, 817-Gas flow gauge, 820-Liquid seepage system, 821-Liquid seepage control system, 822-Liquid inlet pipe, 823-Liquid collection container, 824-Liquid outlet pipe, 825-Upstream liquid pressure gauge, 826-Upstream liquid flow gauge, 827-Upstream liquid cutoff valve, 828-Downstream liquid cutoff valve, 829-Downstream liquid pressure gauge, 8210-Downstream liquid flow gauge, 830-Gas / liquid seepage outlet, 840-Gas / liquid seepage inlet. DETAILED DESCRIPTION

[0039] The embodiments of the present application will be described in detail with reference to the drawings, but they are not intended to limit the present application, and are only examples. At the same time, the advantages of the present application will become more apparent and easy to understand through the description.

[0040] Referring to the accompanying drawings, the rock dynamic and static tension-compression multi-field coupling test device is characterized by comprising a reaction frame 100, a dynamic / static loading system 200, and a sample base 300. Both the dynamic / static loading system 200 and the sample base 300 are located within the reaction frame 100, with the dynamic / static loading system 200 positioned above the sample base 300. The dynamic / static loading system 200 includes an axial dynamic / static loading cylinder 210 fixed to the inner wall of the top plate of the reaction frame 100, an axial force transmission rod 220 fixedly connected to the output end of the axial dynamic / static loading cylinder 210, a force transmission rod sealing barrel 230 enclosing the axial force transmission rod 220, and a confining pressure chamber structure 240.

[0041] The sample base 300 is stepped, and the sample 310 is placed on top of the sample base 300.

[0042] The confining pressure chamber structure 240 includes a confining pressure chamber lifting rod groove 241 disposed on the inner wall of the side plate of the reaction frame 100, and a confining pressure chamber lifting rod 242, one end of which is slidably connected to the confining pressure chamber lifting rod groove 241 and the other end of which is fixedly connected to the confining pressure cavity 243. When the confining pressure chamber lifting rod 242 slides down along the confining pressure chamber lifting rod groove 241 and falls on the step of the sample base 300, a confining pressure chamber is formed between the inner side of the confining pressure cavity 243, the top of the sample base 300, and the bottom of the force transmission rod sealing barrel 230.

[0043] The confining pressure chamber structure 240 also includes a signal cable box 244, which is located inside the reaction frame 100 and below the sample base 300.

[0044] like Figure 13 As shown, the sample 310 is a dumbbell-shaped structure with the diameters at the top and bottom ends being larger than the diameter at the middle. Using the confining pressure chamber structure 240, the confining pressure provides axial tensile force, enabling axial tensile tests of rocks under different confining pressure conditions. The loading of the confining pressure σ in the figure generates tensile stresses Pt at the top and bottom.

[0045] The specimen 310 is covered by a thermoplastic sleeve 311, which, together with the pressure chamber structure 240 that can slide up and down, achieves a glue-free seal between the specimen 310 and the end face of the indenter through the automatic lifting of the pressure chamber 243, effectively preventing hydraulic oil from seeping in. This invention breaks through the limitation of traditional triaxial tensile testing requiring end face adhesive application, significantly improving experimental efficiency and ease of operation, and is especially suitable for axial tensile testing under complex stress conditions. Traditional adhesive application processes require a long time for the adhesive layer to cure in a single test, while the pressure chamber 243 of this invention achieves rapid clamping through mechanical linkage, shortening the preparation time of the specimen 310 to within a few minutes, significantly improving experimental efficiency.

[0046] The temperature test system 400 is further included, which comprises a heating and insulation device 410 arranged outside the force transmission rod sealed barrel 230 and the surrounding pressure cavity 243 when the surrounding pressure chamber lifting rod 242 slides down along the surrounding pressure chamber lifting rod groove 241 and falls on the step of the sample base 300, and a temperature control system 420 arranged outside the counterforce frame 100, which is connected with the heating and insulation device 410 through a first lead wire 421.

[0047] The ultrasonic test system 500 arranged outside the counterforce frame 100 is further included; an ultrasonic emission probe signal line groove 510 is opened inside the axial force transmission rod 220, and an ultrasonic emission probe groove 511 is arranged at the top of the ultrasonic emission probe signal line groove 510; an ultrasonic reception probe signal line groove 520 is opened inside the sample base 300, and an ultrasonic reception probe groove 521 is arranged at the top of the ultrasonic reception probe signal line groove 520.

[0048] The ultrasonic test system 500 is connected with the ultrasonic emission probe 530 arranged in the ultrasonic emission probe groove 511 through the ultrasonic emission probe signal line groove 510, and connected with the ultrasonic reception probe 540 arranged in the ultrasonic reception probe groove 521 through the ultrasonic reception probe signal line groove 520.

[0049] The acoustic emission test system 600 arranged outside the counterforce frame 100 is further included, which is connected with a plurality of acoustic emission probes 620 arranged on the side of the sample 310 through acoustic emission signal lead wires 610.

[0050] The resistivity test system 700 arranged outside the counterforce frame 100 is further included; wire grooves 710 are opened on both sides inside the sample base 300; one side wire groove 710 is used for the second lead wire 720 connected with the upper electrode 730 to pass through, and the other side wire groove 710 is used for the second lead wire 720 connected with the lower electrode 740 to pass through; the resistivity test system 700 is connected with the upper electrode 730 arranged on the upper end of the sample 310 through the second lead wire 720 passing through the wire groove 710, and connected with the lower electrode 740 arranged on the lower end of the sample 310 through the second lead wire 720 passing through the wire groove 710.

[0051] Also included is a seepage measurement system 800, which includes a gas seepage system 810 and a liquid seepage system 820, the test sample base 300 is provided with a gas / liquid seepage outlet 830 on one side and a gas / liquid seepage inlet 840 on the other side; the test sample 310 is provided with an upper end seepage port 314 at the upper end and a lower end seepage port 315 at the lower end; a top semicircular rubber pad 316 is installed on one side of the top of the test sample 310, and a top pad 317 is installed on the other side; a bottom pad 318 is installed on one side of the bottom of the test sample 310, and a bottom semicircular rubber pad 319 is installed on the other side;

[0052] The gas seepage system 810 includes a gas seepage control system 811, a gas inlet pipe 812 connected to the gas seepage control system 811 at one end and connected to the lower end of the test sample 310 through the gas / liquid seepage inlet 840 at the other end, and an exhaust pipe 813 connected to the upper end of the test sample 310 at one end and extending out of the dynamic / static force loading system 200 through the gas / liquid seepage outlet 830 at the other end; the gas inlet pipe 812 is provided with an inlet port shut-off valve 814; the exhaust pipe 813 is provided with an exhaust port shut-off valve 815, a gas pressure gauge 816, and a gas flow gauge 817;

[0053] The liquid seepage system 820 includes a liquid seepage control system 821, a liquid inlet pipe 822 connected to the liquid seepage control system 821 at one end and connected to the lower end of the test sample 310 through the gas / liquid seepage inlet 840 at the other end, and a liquid outlet pipe 824 connected to the upper end of the test sample 310 at one end and connected to a liquid collection container 823 through the gas / liquid seepage outlet 830 at the other end; the liquid inlet pipe 822 is provided with an upstream liquid pressure gauge 825, an upstream liquid flow gauge 826, and an upstream liquid shut-off valve 827; the liquid outlet pipe 824 is provided with a downstream liquid shut-off valve 828, a downstream liquid pressure gauge 829, and a downstream liquid flow gauge 8210.

[0054] The steps of the gas seepage test are as follows: connect the gas inlet pipe 812 to the lower end of the test sample 310, connect the gas inlet pipe 812 to the gas seepage control system 811, and set the inlet port shut-off valve 814 on the gas inlet pipe 812; connect the exhaust pipe 813 to the upper end of the test sample 310, and set the exhaust port shut-off valve 815, the gas pressure gauge 816, and the gas flow gauge 817 on the exhaust pipe 813;

[0055] The steps of the liquid seepage test are as follows: connect the liquid inlet pipe 822 to the lower end of the test sample 310, connect the liquid inlet pipe 822 to the liquid seepage control system 821, and set the upstream liquid pressure gauge 825, the upstream liquid flow gauge 826, and the upstream liquid shut-off valve 827 on the liquid inlet pipe 822; connect the liquid outlet pipe 824 to the upper end of the test sample 310, connect the liquid outlet pipe 824 to the liquid collection container 823, and set the downstream liquid shut-off valve 828, the downstream liquid pressure gauge 829, and the downstream liquid flow gauge 8210 on the liquid outlet pipe 824.

[0056] Embodiment 1

[0057] The test method of the rock dynamic-static tensile and compressive multi-field coupling test device is characterized in that:

[0058] When the triaxial axial tension test is performed, the steps are as follows:

[0059] Step A1: The confining pressure cavity 243 is lifted, the sample 310 is placed on the sample base 300, the sample thermoplastic sleeve 311 is sleeved outside the sample 310, the sample upper end fastening ring 312 is installed on the upper end of the sample thermoplastic sleeve 311, and the sample lower end fastening ring 313 is installed on the lower end.

[0060] Step A2: The confining pressure cavity 243 is slid downward to the step of the sample base 300 through the confining pressure chamber lifting rod 242, the confining pressure chamber is filled with oil, and the confining pressure loading is realized.

[0061] Step A3: The axial force transmission rod 220 is moved downward and tightly attached to the sample 310 through the axial dynamic / static loading oil cylinder 210.

[0062] Step A4: The confining pressure is increased to the required level, the axial stress is gradually reduced through stress or displacement control, until the sample 310 is pulled off, and the test is ended; the specific test can be freely set according to the requirements.

[0063] As shown in Figure 11 and 12 , the triaxial tension test of granite under different confining pressures is performed by using the above test method, and the calculation formula is:

[0064]

[0065] In the formula, σ t is the tensile deviatoric stress, P t is the tensile load, and A is the cross-sectional area of the sample. Due to too many influencing factors of the triaxial tension test, relatively complete data are selected from a large number of test samples, the relationship curve between the tensile deviatoric stress and the displacement is drawn, the axial deviatoric stress result graph of the triaxial tension test under different confining pressures ( Figure 11 ) and the axial stress result graph of the triaxial tension test under different confining pressures ( Figure 12 ) are drawn in combination with the calculation formula of the direct tensile deviatoric stress.

[0066] In actual test, the traditional triaxial tensile test needs end face glue coating, cooperates with the conventional surrounding pressure cavity without mechanical linkage, can cause sample 310 end part to seep oil, causes axial transmission force rod 220 to be unable to stick to sample 310, makes sample 310 unable to be pulled off, causes test failure;The self-adaptive fitting method of heat shrink sleeve is innovatively designed, the glue-free sealing of sample 310 and the end face of axial transmission force rod 220 is realized by the automatic lifting of surrounding pressure cavity 243, and the seepage of hydraulic oil is effectively blocked;The technology breaks through the limitation of traditional triaxial tensile test needing end face glue coating, significantly improves experimental efficiency and operation convenience, and is especially suitable for axial tensile test under complex stress state;And the surrounding pressure cavity 243 of the application realizes quick clamping by mechanical linkage, shortens the sample preparation time to a few minutes, and significantly improves the test efficiency.

[0067] Example 2

[0068] When triaxial compression test is carried out, the steps are as follows:

[0069] Step B1: the surrounding pressure cavity 243 is lifted, the sample 310 is placed on the sample base 300, the sample thermoplastic sleeve 311 is sleeved outside the sample 310, the sample upper end fastening ring 312 is installed on the upper end of the sample thermoplastic sleeve 311, and the sample lower end fastening ring 313 is installed on the lower end of the sample thermoplastic sleeve 311;

[0070] Step B2: the surrounding pressure cavity 243 is slid downward on the step of sample base 300 by surrounding pressure chamber lifting rod 242, the surrounding pressure chamber is filled with oil, and surrounding pressure loading is realized;

[0071] Step B3: the axial transmission force rod 220 is moved downward and closely attached to the sample 310 by the axial dynamic / static loading oil cylinder 210;

[0072] Step B4: triaxial compression test is realized by axial static force loading, and the specific test can be freely set according to requirements;

[0073] Example 3

[0074] When triaxial dynamic impact test is carried out, the steps are as follows:

[0075] Step C1: the surrounding pressure cavity 243 is lifted, the sample 310 is placed on the sample base 300, the sample thermoplastic sleeve 311 is sleeved outside the sample 310, the sample upper end fastening ring 312 is installed on the upper end of the sample thermoplastic sleeve 311, and the sample lower end fastening ring 313 is installed on the lower end of the sample thermoplastic sleeve 311;

[0076] Step C2: the surrounding pressure cavity 243 is slid downward on the step of sample base 300 by surrounding pressure chamber lifting rod 242, the surrounding pressure chamber is filled with oil, and surrounding pressure loading is realized;

[0077] Step C3: the axial transmission force rod 220 is moved downward and closely attached to the sample 310 by the axial dynamic / static loading oil cylinder 210.

[0078] Step C4: Apply dynamic load by axial dynamic / static loading oil cylinder 210, dynamic load is 0-500kN, frequency is 0-10Hz, amplitude is 0.5mm;

[0079] Step C5: Complete triaxial dynamic impact test according to test requirements;

[0080] Example 4

[0081] When performing dynamic and static triaxial multi-field coupling test at different temperatures, the steps are as follows:

[0082] Step D1: Lift the confining pressure chamber 243, place the sample 310 on the sample base 300, and wrap the sample thermoplastic sleeve 311 outside the sample 310. Install the sample upper end fastening ring 312 on the upper end of the sample thermoplastic sleeve 311, and install the sample lower end fastening ring 313 on the lower end of the sample thermoplastic sleeve 311;

[0083] Step D2: Slide the confining pressure chamber 243 down on the step of the sample base 300 by the confining pressure chamber lifting rod 242, fill the confining pressure chamber with oil, and realize confining pressure loading;

[0084] Step D3: Move the axial force transmission rod 220 down and tightly against the sample 310 by the axial dynamic / static loading oil cylinder 210;

[0085] Step D4: Place the heating and insulation device 410 outside the force transmission rod sealing barrel 230 and the confining pressure chamber 243, connect the temperature control system 420 through the first lead wire 421, and realize different temperature control through the temperature control system 420;

[0086] Step D5: Combine step A4 or step B4 to realize dynamic and static triaxial multi-field coupling test at different temperatures.

[0087] The steps of acoustic emission test, ultrasonic test, resistivity test, gas permeation test, and liquid seepage test are used as pre-step alone or in combination with triaxial axial tensile test, triaxial compression test, triaxial dynamic impact test, and dynamic and static triaxial multi-field coupling test at different temperatures to realize multi-field coupling test. The specific steps are as follows:

[0088] Example 5: True triaxial shear seepage coupling test

[0089] When performing true triaxial shear seepage coupling test, the steps are as follows:

[0090] Step 1: Install the upper half-round rubber pad 316 and the lower half-round rubber pad 319 on the upper end of the sample 310. Connect the seepage measurement system 800 through the gas / liquid seepage outlet 830 and the gas / liquid seepage inlet 840 on the other side;

[0091] Step 2: When doing gas permeation test, open the gas permeation control system 811 switch valve, observe the gas pressure gauge 816 and gas flow meter 817, record the values, through the gas inlet valve 814 to the test target pressure; axial pressure and confining pressure loading process is consistent with steps A1-A4, record the stress, displacement, permeation test data in the loading process, complete the conventional triaxial shear gas permeation coupling test;

[0092] When doing liquid permeation test, open the upstream liquid cutoff valve 827 and downstream liquid cutoff valve 828, adjust the permeation pressure and flow through the liquid permeation control system 821, and display the values on the upstream liquid pressure gauge 825, upstream liquid flow meter 826, downstream liquid pressure gauge 829, and downstream liquid flow meter 8210. The excluded liquid is collected through the liquid collection container 823. The liquid can be water or other chemical solutions (such as hydrochloric acid solution, sulfuric acid solution, sodium chloride solution, etc.). The axial pressure and confining pressure loading process is consistent with steps A1-A4, and the stress, displacement, and permeation test data in the loading process are recorded to realize the conventional triaxial shear liquid permeation or chemical corrosion multi-field coupling test.

[0093] Example 6

[0094] The steps of acoustic emission testing during the dynamic-static triaxial tension-compression multi-field coupling test are as follows: 8 acoustic emission probes 620 are arranged on both sides of the sample 310, and the acoustic emission signal leads 610 are connected to the acoustic emission testing system 600.

[0095] In combination with examples 1-5, acoustic emission testing during the dynamic-static triaxial shear rheological THMC multi-field coupling test is completed.

[0096] Example 7

[0097] The steps of ultrasonic testing during the dynamic-static triaxial tension-compression multi-field coupling test are as follows:

[0098] The ultrasonic emission probe 530 is arranged in the ultrasonic emission probe slot 511, and the ultrasonic emission probe 530 is connected to the ultrasonic testing system 500 through the ultrasonic emission probe signal line slot 511. The ultrasonic receiving probe 540 is arranged in the ultrasonic receiving probe slot 521, and the ultrasonic receiving probe 540 is connected to the ultrasonic testing system 500 through the ultrasonic receiving probe signal line slot 520.

[0099] In combination with examples 1-6, ultrasonic testing during the dynamic-static triaxial tension-compression multi-field coupling test is completed.

[0100] Example 8

[0101] The steps of the resistivity test in the triaxial tensile and compressive multi-field coupling test are as follows: the upper electrode 730 is arranged at the upper end of the sample 310, and the resistivity test system 700 is connected through the second lead wire 720; the lower electrode 740 is arranged at the lower end of the sample 310, and the resistivity test system 700 is connected through the second lead wire 720;

[0102] In combination with examples 1-7, the ultrasonic test in the triaxial tensile and compressive multi-field coupling test is completed.

[0103] In summary, the present application can perform conventional triaxial tensile test, conventional triaxial compression test, conventional triaxial dynamic impact test, gas permeation test, liquid seepage test, chemical corrosion test, temperature test, ultrasonic test, acoustic emission test and resistivity test, etc. multi-field coupling test; any one of examples 1-8 can be completed alone, and multiple free combinations can be performed, which is a multifunctional multi-field coupling test device.

[0104] Other unexplained parts belong to the prior art.

Claims

1. A multi-field coupled test apparatus for dynamic and static tension and compression of rocks, characterized in that: It includes a reaction frame (100), a dynamic / static loading system (200), and a sample base (300); the dynamic / static loading system (200) and the sample base (300) are both located inside the reaction frame (100), and the dynamic / static loading system (200) is located above the sample base (300). The dynamic / static loading system (200) includes an axial dynamic / static loading cylinder (210) fixed to the inner wall of the top plate of the reaction frame (100), an axial force transmission rod (220) fixedly connected to the output end of the axial dynamic / static loading cylinder (210), a force transmission rod sealing barrel (230) that wraps the axial force transmission rod (220), and a confining pressure chamber structure (240). The sample base (300) is stepped, and the sample (310) is placed on top of the sample base (300); The confining pressure chamber structure (240) includes a confining pressure chamber lifting rod groove (241) set on the inner wall of the side plate of the reaction frame (100), a confining pressure chamber lifting rod (242) with one end slidably connected to the confining pressure chamber lifting rod groove (241) and the other end fixedly connected to the confining pressure cavity (243); when the confining pressure chamber lifting rod (242) slides down along the confining pressure chamber lifting rod groove (241) and lands on the step of the sample base (300), a confining pressure chamber is formed between the inner side of the confining pressure cavity (243), the top of the sample base (300), and the bottom of the force transmission rod sealing barrel (230).

2. The multi-field coupled rock dynamic and static tension-compression test device according to claim 1, characterized in that: The confining pressure chamber structure (240) also includes a signal cable box (244), which is located inside the reaction frame (100) and below the sample base (300).

3. The multi-field coupled rock dynamic and static tension-compression test device according to claim 1, characterized in that: The sample (310) is a dumbbell-shaped structure with the diameters at the top and bottom ends being larger than the diameter at the middle.

4. The multi-field coupled rock dynamic and static tension-compression test device according to claim 1, characterized in that: It also includes a temperature testing system (400), which includes a heating and heat preservation device (410) and a temperature control system (420); when the confining pressure chamber lifting rod (242) slides down along the confining pressure chamber lifting rod groove (241) and lands on the step of the sample base (300), the heating and heat preservation device (410) is arranged on the outer wall of the force transmission rod sealing barrel (230) and the confining pressure chamber (243); the temperature control system (420) is arranged outside the reaction frame (100), and the temperature control system (420) is connected to the heating and heat preservation device (410) through the first wire (421).

5. The multi-field coupled rock dynamic and static tension-compression test device according to claim 1, characterized in that: It also includes an ultrasonic testing system (500) disposed outside the reaction frame (100); the axial force transmission rod (220) has an ultrasonic transmitting probe signal wire groove (510) inside, and an ultrasonic transmitting probe groove (511) is disposed on the top of the ultrasonic transmitting probe signal wire groove (510); the sample base (300) has an ultrasonic receiving probe signal wire groove (520) inside, and an ultrasonic receiving probe groove (521) is disposed on the top of the ultrasonic receiving probe signal wire groove (520). The ultrasonic testing system (500) is connected to the ultrasonic transmitting probe (530) located in the ultrasonic transmitting probe slot (511) via the ultrasonic transmitting probe signal cable slot (510), and to the ultrasonic receiving probe (540) located in the ultrasonic receiving probe slot (521) via the ultrasonic receiving probe signal cable slot (520).

6. The multi-field coupled rock dynamic and static tension-compression test device according to claim 1, characterized in that: It also includes an acoustic emission testing system (600) disposed outside the reaction frame (100), the acoustic emission testing system (600) being connected to a plurality of acoustic emission probes (620) disposed on the side of the sample (310) via acoustic emission signal wires (610).

7. The multi-field coupled rock dynamic and static tension-compression test device according to claim 1, characterized in that: It also includes a resistivity testing system (700) disposed outside the reaction frame (100); the sample base (300) has wire grooves (710) on both sides inside; the resistivity testing system (700) is connected to the upper electrode (730) arranged on the upper end of the sample (310) through the second wire (720) passing through the wire groove (710), and is connected to the lower electrode (740) arranged on the lower end of the sample (310) through the second wire (720) passing through the wire groove (710).

8. The multi-field coupled rock dynamic and static tension-compression test device according to claim 1, characterized in that: It also includes a seepage measurement system (800), which includes a gas permeation system (810) and a liquid permeation system (820). The sample base (300) has a gas / liquid permeation outlet (830) on one side and a gas / liquid permeation inlet (840) on the other side. The gas permeation system (810) includes a gas permeation control system (811), an inlet pipe (812) connected at one end to the gas permeation control system (811) and at the other end to the lower end of the sample (310) through a gas / liquid permeation inlet (840), and an exhaust pipe (813) connected at one end to the upper end of the sample (310) and at the other end to extend out of the dynamic / static loading system (200) through a gas / liquid permeation outlet (830); an inlet shut-off valve (814) is provided on the inlet pipe (812); and an exhaust shut-off valve (815), a gas pressure gauge (816), and a gas flow meter (817) are provided on the exhaust pipe (813). The liquid permeation system (820) includes a liquid permeation control system (821), an inlet pipe (822) connected at one end to the liquid permeation control system (821) and at the other end to the lower end of the sample (310) via a gas / liquid permeation inlet (840), and a drain pipe (824) connected at one end to the upper end of the sample (310) and at the other end to a liquid collection container (823) via a gas / liquid permeation outlet (830). The inlet pipe (822) is equipped with an upstream liquid pressure gauge (825), an upstream liquid flow meter (826), and an upstream liquid shut-off valve (827). The drain pipe (824) is equipped with a downstream liquid shut-off valve (828), a downstream liquid pressure gauge (829), and a downstream liquid flow meter (8210).

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