Triaxial seepage test device for simulating excavation disturbance

Abstract

The utility model discloses a triaxial seepage test device for simulating excavation disturbance, which comprises a host system, a triaxial pressure chamber, a rock triaxial test system test module and a measurement module, and the rock triaxial test system test module comprises an axial dynamic load loading system and a temperature control system. The axial dynamic load loading system enables the triaxial pressure chamber to be disturbed by a vibration field, the temperature control system enables the triaxial pressure chamber to be disturbed by temperature change, and the seepage and rheological test under the action of different physical fields (a mechanical field, a temperature field and the like) of different sizes can be carried out. The utility model discloses a triaxial seepage experiment device for simulating excavation disturbance under various working conditions.

Description

[Technical field]

[0001] The invention relates to the field of seepage mechanics test devices, and in particular to a triaxial seepage test device for simulating mining disturbance. [Background technology]

[0002] my country is a major producer of coal resources. Coal has always been an important basic energy source and has an important strategic position in the national economy. However, the large amount of gas poses a great threat to the safe mining of coal. Deep geodynamic disasters such as coal and gas outbursts and rock bursts are mostly caused by external medium and low strain rate dynamic disturbances of coal rock mass under high stress conditions. Affected by complex deep geological conditions and complex mechanical conditions such as high ground stress, high and low temperatures, high osmotic pressure, and strong engineering disturbances, the coal body is actually in a combined superposition stress state of dynamic load disturbance under static load and gas adsorption. Therefore, further understanding the law of coal seam gas seepage under complex environments is of great forward-looking significance for improving gas seepage theory and gas extraction technology and equipment. [Contents of the utility model]

[0003] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and to provide a triaxial seepage experimental device that can carry out seepage and rheological tests of different sizes under the action of different physical fields (mechanical fields, temperature fields, etc.) and simulate mining disturbances under various working conditions.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A triaxial seepage test device for simulating mining disturbance, comprising:

[0006] Host system, used to receive, process and output signals and control the operation of the test device;

[0007] A triaxial pressure chamber, which tests the coal and rock samples placed therein by receiving and processing the signals from the host system;

[0008] A rock triaxial test system test module generates mechanical conditions for simulating mining disturbances and applies test conditions to coal and rock samples in the triaxial pressure chamber;

[0009] A measuring module is used to measure various parameters of the coal and rock samples in the triaxial pressure chamber;

[0010] The rock triaxial test system test module includes an axial dynamic load loading system and a temperature control system. The axial dynamic load loading system allows the triaxial pressure chamber to be disturbed by a vibration field, and the temperature control system allows the triaxial pressure chamber to be disturbed by temperature changes.

[0011] For example, a triaxial seepage test device simulating mining disturbance is described above.

[0012] The triaxial pressure chamber comprises a test chamber, an upper seepage pressure head is connected above the test chamber, and a lower seepage pressure head is connected below the test chamber.

[0013] For example, a triaxial seepage test device simulating mining disturbance is described above.

[0014] The upper part of the triaxial pressure chamber is connected to an axial pressure chamber, the lower part of the triaxial pressure chamber is connected to a confining pressure chamber, and a high-pressure three-way valve for oil filling and oil discharge is installed at the side end of the triaxial pressure chamber.

[0015] For example, a triaxial seepage test device simulating mining disturbance is described above.

[0016] The axial dynamic load loading system includes a servo cylinder installed above the three-axis pressure chamber. The servo cylinder is connected to a hydraulic source. The servo cylinder is controlled by a signal input from the host system to vibrate downward, thereby applying a vibration field disturbance to the three-axis pressure chamber below the servo cylinder.

[0017] For example, a triaxial seepage test device simulating mining disturbance is described above.

[0018] The temperature control system comprises a low-temperature coolant storage ring pump, which is connected to the confining pressure chamber and controls the temperature change of the triaxial pressure chamber through the signal input by the host system.

[0019] For example, a triaxial seepage test device simulating mining disturbance is described above.

[0020] The rock triaxial test system test module also includes a triaxial stress loading system, which controls the axial pressure chamber and the confining pressure chamber through the signal input by the host system to apply stress field disturbance to the triaxial pressure chamber.

[0021] For example, a triaxial seepage test device simulating mining disturbance is described above.

[0022] The rock triaxial test system test module also includes a seepage system, which determines the permeability of the coal rock sample by simulating the process of fluid passing through the coal rock sample through the axial pressure chamber and the confining pressure chamber.

[0023] For example, a triaxial seepage test device simulating mining disturbance is described above.

[0024] The rock triaxial test system test module also includes a bulk material compaction system, which compacts the bulk material through the axial pressure chamber and the confining pressure chamber.

[0025] For example, a triaxial seepage test device simulating mining disturbance is described above.

[0026] The measurement module includes an automatic control and measurement system, which controls the axial pressure chamber and the confining pressure chamber to adjust the pressure of the fluid according to the needs of the test through the signal input from the host system, and collects data through the sensors in the axial pressure chamber and the confining pressure chamber.

[0027] For example, a triaxial seepage test device simulating mining disturbance is described above.

[0028] The measurement module also includes an acoustic wave and resistance measurement system, which detects changes in the internal structure of the coal and rock samples, the development of cracks, and the electrical properties of the materials through sensors in the triaxial pressure chamber.

[0029] Compared with the existing technology, this device has the following advantages and technical effects:

[0030] 1. The test system can not only carry out triaxial static and dynamic loading tests on standard parts and bulk parts, but also carry out seepage and rheological tests of different size tests under different physical fields (mechanical field, temperature field, electromagnetic field, etc.), and obtain data parameters such as gas flow, acoustic emission, sound wave velocity, and coal body resistance.

[0031] 2. The test instrument is fully functional and can simultaneously test the mechanical properties and seepage characteristics of coal and rock under various working conditions;

[0032] 3. Static load can be preloaded on the test under gas-solid coupling conditions and disturbance loads such as vibration loads can be applied to truly simulate the stress environment of the disturbed coal rock mass;

[0033] 4. It can simultaneously measure the axial and circumferential deformation of coal and rock under triaxial conditions with high precision, and the measurement accuracy can reach micron level.

Brief Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

[0035] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0036] Figure 2 It is a schematic diagram of the internal structure of the triaxial pressure chamber;

[0037] Figure 3 It is a structural diagram of the test system of the utility model;

[0038] Figure 4 The device of the utility model is shown in FIG. Figure 1 ;

[0039] Figure 5 The device of the utility model is shown in FIG. Figure 2;

[0040] Figure 6 The device of the utility model is shown in FIG. Figure 3 . [Specific implementation method]

[0041] A triaxial seepage test device for simulating mining disturbance, comprising: a host system 1, for receiving, processing and outputting signals, and controlling the operation of the test device; a triaxial pressure chamber 2, for testing coal and rock samples placed therein by receiving and processing signals from the host system 1; a rock triaxial test system test module 3, for generating mechanical conditions for simulating mining disturbance, and applying multi-dimensional test conditions to the coal and rock samples in the triaxial pressure chamber 2; a measurement module 4, for measuring multiple parameters of the coal and rock samples in the triaxial pressure chamber 2; the rock triaxial test system test module 3 comprises an axial dynamic load loading system 31 and a temperature control system 32, wherein the axial dynamic load loading system 31 enables the triaxial pressure chamber 2 to be disturbed by a vibration field, and the temperature control system 32 enables the triaxial pressure chamber 2 to be disturbed by temperature changes.

[0042] Furthermore, the test device includes a host system 1, a hydraulic servo universal testing machine controller 501, and an electrical control cabinet 502, and these three devices are respectively connected to other experimental devices.

[0043] Furthermore, the test device also includes a three-axis experimental host 503, which is a hollow device of a rectangular parallelepiped as a whole. The upper end of the host is connected to a hand control box 504, and the upper end of the hollow interior is a servo cylinder 210. A sensor is arranged in the servo cylinder 210. A cylindrical structure that can slide up and down between the servo cylinder 210 and the sensor, and the distance between the two is the axial displacement, and the lower end of the hollow part has a device similar to a trolley, including a slide rail 505, and a base 506 is arranged on the slide rail 505. The entire device on the base 506 is a three-axis pressure chamber. 2. A high-pressure three-way valve 209 is provided on the side of the triaxial pressure chamber 2. The high-pressure three-way valve 209 is next to the axial pressure chamber 204. The upper end of the triaxial pressure chamber 2 is a loading piston rod 507. There is a lifting device 508 on the upper end of the entire main machine. The triaxial pressure chamber 2 is lifted by pressing the up and down buttons of the hand control box 504, leaving the base 506 and the confining pressure chamber 205. The confining pressure chamber 205 has a sensor to transmit data for the convenience of result analysis. The outer circle of the base 506 has many holes, such as the pore pressure outlet 208, the pore pressure inlet 207, the confining pressure hole 206, etc. The base 506 is provided with a test chamber 201. After the test piece is placed in the test chamber 201, the gas in the test chamber 201 needs to be exhausted by an oil-free air compressor 509 to maintain a vacuum state, and then the gas is filled in through the gas cylinder 510. The lower end of the test chamber 201 is a seepage lower pressure head 203 , and the upper end is a seepage upper pressure head 202 . The test chamber 201 is fixed by a sealing sleeve 511 , and a fastening bolt 512 is disposed on the sealing sleeve 511 .

[0044] Furthermore, the test device also includes a confining pressure cabinet 513, and a bore pressure cabinet 514 is connected to the hydraulic source 211. The confining pressure cabinet 513 and the bore pressure cabinet 514 are provided with an oil outlet valve 515 and an oil suction valve 516. The hydraulic source 211 is provided with a pressure gauge 517. A confining pressure regulating valve 518 and a bore pressure regulating valve 519 are connected to the pressure gauge 517. The device also has an auxiliary main motor 520 and an auxiliary small motor 521. Next to the small motor is an oil barrel 522 connected to the pressure chamber. Next to the oil barrel 522 is a heat exchanger 523, and the heat exchanger 523 is connected to a water tank 524. Before turning on the main motor, the water pump must be turned on first to discharge the heat through water to the cooling fan of the water tank 524.

[0045] When doing high and low temperature experiments, a low temperature coolant storage ring pump 212 is required. The device is connected to the confining pressure chamber, and the refrigeration can be turned on. The temperature can be increased by adjusting the electrical control cabinet 502. The temperature range of the system is -30℃—110℃.

[0046] Furthermore, the triaxial pressure chamber 2 includes a test chamber 201 , an upper seepage pressure head 202 is connected to the upper side of the test chamber 201 , and a lower seepage pressure head 203 is connected to the lower side of the test chamber 201 .

[0047] Furthermore, the upper part of the triaxial pressure chamber 2 is connected to the axial pressure chamber 204, and the lower part of the triaxial pressure chamber 2 is connected to the confining pressure chamber 205. The base 506 of the pressure chamber is provided with a confining pressure hole 206, a hole pressure inlet 207 and a hole pressure outlet 208 connected to the confining pressure chamber 205, and the side end of the triaxial pressure chamber 2 is installed with a high-pressure three-way valve 209 for oil injection and oil discharge.

[0048] Furthermore, the axial dynamic load loading system 31 includes a servo cylinder 210 installed above the triaxial pressure chamber 2, and the servo cylinder 210 is connected to a hydraulic source 211. The signal input by the host system 1 causes the servo cylinder 210 to vibrate, thereby applying a vibration field disturbance to the triaxial pressure chamber 2 below the servo cylinder 210.

[0049] Furthermore, the temperature control system 32 includes a low-temperature coolant storage ring pump 212 , which is connected to the confining pressure chamber 205 , and causes the triaxial pressure chamber 2 to produce a temperature change through a signal input by the host system 1 .

[0050] Furthermore, the rock triaxial test system test module 3 also includes a triaxial stress loading system 33 , which enables the axial pressure chamber 204 and the confining pressure chamber 205 to apply stress field disturbance to the triaxial pressure chamber 2 through the signal input by the host system 1 .

[0051] Furthermore, the rock triaxial test system test module 3 also includes a seepage system 34 , and the seepage system 34 simulates the process of fluid passing through the coal rock sample through the axial pressure chamber 204 and the confining pressure chamber 205 to determine the permeability of the coal rock sample.

[0052] Furthermore, the seepage system 34 is associated with the triaxial pressure chamber 2. By pressing the up and down keys of the hand control box 504, the sleeve of the triaxial pressure chamber 2 is lifted, and the inside of the triaxial pressure chamber 2 is left. The upper end of the internal base 506 is the test chamber 201 fastened by the sealing sleeve 511. The experimental specimen is placed in the test chamber 201. The lower end of the test chamber 201 is the seepage lower pressure head 203, and the upper end of the test chamber 201 is the seepage upper pressure head 202. There are fastening bolts 512 on the sealing sleeve 511. The pressure chamber is connected to an oil-free air compressor 509 and a gas cylinder 510. After the test is placed in the test chamber 201, the gas in the test chamber 201 is exhausted by the oil-free air compressor 509, the vacuum state is maintained, and then the gas is filled.

[0053] Furthermore, the rock triaxial test system test module 3 also includes a bulk material compaction system 35, which compacts the bulk material through the axial pressure chamber 204 and the confining pressure chamber 205 so as to perform a seepage test.

[0054] Furthermore, the automatic control and measurement system 41 includes an electrical control cabinet 502, a computer and an electro-hydraulic servo universal testing machine controller 501. The electrical control cabinet 502 needs to start the oil pump, then reduce the pressure, and switch to high pressure before controlling the oil cylinder. After the experiment is completed, the oil pump is stopped after reducing the pressure. The software required for the experiment is installed in the computer to set the variables. The controller is mainly responsible for data collection, processing and analysis.

[0055] Furthermore, the measurement module 4 includes an automatic control and measurement system 41, which inputs the signal from the host system 1 so that the axial pressure chamber 204 and the confining pressure chamber 205 adjust the pressure of the fluid according to the needs of the test and collect, process and analyze data through the sensors in the axial pressure chamber 204 and the confining pressure chamber 205.

[0056] Furthermore, the measurement module 4 also includes an acoustic wave and resistance measurement system 42, which detects changes in the internal structure of the coal and rock samples, the development of cracks, and the electrical properties of the materials through sensors in the triaxial pressure chamber 2.

[0057] The specific steps are:

[0058] Step 1: First, turn on the auxiliary main motor 520, use the manual control box 504, press down, screw the lifting screw on the lifting device 508 into the pressure chamber pressure rod, lift the pressure chamber cover through the manual control box 504 lifting button, place the sample on the pressure chamber, wrap the sample with heat shrink tube, wrap the upper and lower ends with electrical tape for several turns, first fix the lower end of the axial extensometer, install the axial extensometer, and finally adjust the upper and lower ends of the axial extensometer to keep them horizontal. After adjustment, tighten the fixing screws. Connect the deformation line to the socket, drop the pressure chamber cover through the manual control box 504, and match them, remove the lifting screws, and raise the lifting cylinder through the manual control box 504, install the three clamps on the base 506 and tighten the screws, screw the exhaust joint on the pressure chamber, and connect the exhaust pipe to the pressure chamber and the oil return pipe of the oil barrel 522.

[0059] Step 2: Close the oil return valve of the oil barrel 522, start the oil filling pump of the oil barrel 522 on the control module board, and start the oil outlet valve on the confining pressure cabinet 513, then open the oil suction valve, wait for oil to come out from the top of the pressure chamber, turn off the oil filling pump, close the three-way valve on the cylinder to fill the pressure chamber with oil, and the excess oil flows back to the oil tank from the air hole through the air pipe, and then close the exhaust valve.

[0060] Step 3: According to the test requirements, click closed-loop control on the test computer software, set the rate, set the target value, and click load.

[0061] Step 4: After the test is completed, unload the pressure in the pressure chamber to zero, stop the confining pressure motor, open the three-way valve on the pressure regulating cylinder, open the oil return valve on the oil barrel 522, connect the joint on the pressure chamber, and connect the air compressor to the joint on the pressure chamber with the air pipe, start the air compressor, fill the pressure chamber with air, and drain the oil in the pressure chamber. If you hear the sound of air being discharged from the oil barrel 522, you can turn off the air compressor and remove the air pipe. Push the pressure chamber out of the center of the main machine, remove the multiple clamps, screw the lifting cylinder screws on the pressure chamber, press the cylinder up button on the manual control box 504 to lift the upper cover of the pressure chamber, loosen the deformation sensor, and take out the test piece. Clean the pressure chamber base 506. If you continue to do the triaxial test, follow the above steps. If you terminate the triaxial test, lower the upper pressure cylinder by lowering the lifting cylinder.

[0062] The above is an implementation method provided in combination with specific content, and it is not considered that the specific implementation of the utility model is limited to these descriptions. At the same time, due to different industry names, it is not limited to the above names, nor is it limited to English names. Any method, structure, etc. similar to or identical to the method, structure, etc. of the utility model, or a number of technical deductions or replacements made on the premise of the concept of the utility model, shall be regarded as the protection scope of the utility model.

Claims

1. A triaxial seepage test device for simulating mining disturbance, characterized in that: include, A host system (1), used for receiving, processing and outputting signals and controlling the operation of the test device; A triaxial pressure chamber (2) is used to test the coal and rock samples placed therein by receiving and processing the signals from the host system (1); A rock triaxial test system test module (3) generates mechanical conditions for simulating mining disturbances and applies test conditions to the coal and rock samples in the triaxial pressure chamber (2); A measuring module (4) for measuring various parameters of the coal and rock samples in the triaxial pressure chamber (2); The rock triaxial test system test module (3) comprises an axial dynamic load loading system (31) and a temperature control system (32). The axial dynamic load loading system (31) enables the triaxial pressure chamber (2) to be disturbed by a vibration field, and the temperature control system (32) enables the triaxial pressure chamber (2) to be disturbed by temperature changes.

2. A triaxial seepage test device for simulating mining disturbance according to claim 1, characterized in that: The triaxial pressure chamber (2) comprises a test chamber (201), the upper part of the test chamber (201) is connected to a seepage upper pressure head (202), and the lower part of the test chamber (201) is connected to a seepage lower pressure head (203).

3. A triaxial seepage test device for simulating mining disturbance as claimed in claim 2, characterized in that: The upper part of the triaxial pressure chamber (2) is connected to an axial pressure chamber (204), the lower part of the triaxial pressure chamber (2) is connected to a confining pressure chamber (205), and a high-pressure three-way valve (209) for oil injection and oil discharge is installed at the side end of the triaxial pressure chamber (2).

4. A triaxial seepage test device for simulating mining disturbance as claimed in claim 1, characterized in that: The axial dynamic load loading system (31) comprises a servo cylinder (210) installed above the triaxial pressure chamber (2); the servo cylinder (210) is connected to a hydraulic source (211); and the servo cylinder (210) is controlled by a signal input from the host system (1) to vibrate downward, thereby applying a vibration field disturbance to the triaxial pressure chamber (2) below the servo cylinder (210).

5. A triaxial seepage test device for simulating mining disturbance as claimed in claim 3, characterized in that: The temperature control system (32) comprises a low-temperature coolant storage ring pump (212), wherein the low-temperature coolant storage ring pump (212) is connected to the confining pressure chamber (205) and controls the temperature change of the triaxial pressure chamber (2) through a signal input from the host system (1).

6. A triaxial seepage test device for simulating mining disturbance as claimed in claim 3, characterized in that: The rock triaxial test system test module (3) also includes a triaxial stress loading system (33), which controls the axial pressure chamber (204) and the confining pressure chamber (205) to apply stress field disturbance to the triaxial pressure chamber (2) through the signal input by the host system (1).

7. A triaxial seepage test device for simulating mining disturbance as claimed in claim 3, characterized in that: The rock triaxial test system test module (3) further comprises a seepage system (34), wherein the seepage system (34) simulates a process of fluid passing through the coal rock sample through the axial pressure chamber (204) and the confining pressure chamber (205) to determine the permeability of the coal rock sample.

8. A triaxial seepage test device for simulating mining disturbance as claimed in claim 3, characterized in that: The rock triaxial test system test module (3) also includes a bulk material compaction system (35) for compacting the bulk material through the axial pressure chamber (204) and the confining pressure chamber (205).

9. A triaxial seepage test device for simulating mining disturbance as claimed in claim 3, characterized in that: The measuring module (4) includes an automatic control and measuring system (41), which controls the axial pressure chamber (204) and the confining pressure chamber (205) to adjust the pressure of the fluid according to the needs of the test through the signal input by the host system (1), and collects data through the sensors in the axial pressure chamber (204) and the confining pressure chamber (205).

10. The triaxial seepage test device for simulating mining disturbance according to claim 1, characterized in that: The measurement module (4) also includes an acoustic wave and resistance measurement system (42) for detecting changes in the internal structure of the coal and rock samples, the development of cracks, and the electrical properties of the materials through sensors in the triaxial pressure chamber (2).

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