Visual rheological test device and method for hydraulic-stress-temperature coupling effect

Abstract

The invention provides a visualized rheological test device and method for a hydraulic-stress-temperature coupling effect, and belongs to the field of stability research of geotechnical materials under a multi-field coupling effect, and a visualized hydraulic-stress-temperature multi-field coupling test system is mainly composed of a control system, an acquisition system and a loading system; the hydraulic-stress-temperature coupling test of the geotechnical material can be completely carried out, the influence of influence factors such as hydraulic power and temperature on the mechanical property of the geotechnical material in the loading and unloading process can be deeply researched, and an image and a strain field of fracture evolution of the geotechnical material in the whole process in the test can be recorded through an industrial high-speed camera; the interaction and mutual influence rules among the stress field, the seepage field and the temperature field and the fracture mechanism of the geotechnical material under the action of multiple fields are disclosed.

Description

Technical Field

[0001] The present invention relates to the field of stability research of geotechnical materials under multi-field coupling, and in particular to a rheological test device and method for visualized hydraulic-stress-temperature coupling. Background Art

[0002] Due to the complex and changeable underground environment of rock and soil, the mechanical properties of rock and soil change after being disturbed by human engineering activities, which can easily induce problems such as engineering instability. At present, most of the research on the mechanical properties of rock and soil under multi-field coupling conditions is concentrated on numerical simulation research, and less related experimental research is used; or multi-field coupling experiments are mostly two-field coupling, or first processed in a certain environment and then coupled in another field or two other fields, which fails to achieve multi-field coupling in the true sense. Summary of the invention

[0003] In view of the above-mentioned background technical problems, the present invention provides a visualization test device and method for stress-hydraulic-temperature multi-field coupling of rock and soil materials in a water pressure environment. The test device can obtain the basic mechanical parameters of rock and soil under multi-field coupling conditions, and provide a basis for multi-field coupling field theoretical research and numerical simulation. This device takes rock and soil in the fields of underground cave excavation, oil and gas drilling and geothermal development and utilization as the research object, and through the invented stress field-seepage field-temperature field coupling simulation device, it truly simulates the influence of disturbance and storage environment on rock and soil materials in the fields of underground cave excavation, oil and gas drilling and geothermal development and utilization. The mechanical properties and damage evolution laws of rock and soil materials in a water pressure environment and a temperature environment under loading and unloading are studied, and the mutual influence between stress field, seepage field and temperature field and the water-rock effect under coupling conditions are revealed.

[0004] In order to realize the above-mentioned technical features, the object of the present invention is realized as follows: a rheological test device with visualized hydraulic-stress-temperature coupling effect, comprising an axial pressurizing device for providing axial load to geotechnical materials and measuring the axial strain change value of the geotechnical materials, an image acquisition device for recording the geotechnical material rupture test process is arranged on the periphery of the axial pressurizing device, and a visualized water pressure chamber is arranged on the axial pressurizing device.

[0005] The image acquisition device is three industrial high-speed cameras, which are arranged around the rock and soil materials, and each camera is arranged at an angle of 120° to each other.

[0006] The visualized water pressure chamber comprises a lower plate of a pressure chamber lower base, a lower plate of a pressure chamber lower base is arranged on the top of the lower plate of the pressure chamber lower base, a high-strength transparent acrylic pressure chamber wall is arranged on the top of the upper plate of the pressure chamber lower base, a pressure chamber upper base is arranged on the top of the high-strength transparent acrylic pressure chamber wall, and a force transmission rod is arranged through the center of the pressure chamber upper base.

[0007] The force transmission rod and the upper base of the pressure chamber are matched with a sliding seal; An exhaust valve is provided on the upper base of the pressure chamber; The exhaust valve is connected to the interior of the visualized water pressure chamber; the exhaust valve is threaded, and is in a closed state when tightened, and in an open state when loosened.

[0008] The pressure chamber upper base is connected to the high-strength transparent acrylic pressure chamber wall and the upper plate of the pressure chamber lower base by a first high-strength stainless steel screw as a whole; The contact parts between the upper base of the pressure chamber, the high-strength transparent acrylic pressure chamber wall and the upper plate of the lower base of the pressure chamber are coated with sealant.

[0009] The lower plate of the lower base of the pressure chamber is provided with a water pressure boosting / relieving port, a drain port, a heating pipe, a heating pipe bracket, a wire outlet and an O-ring; The lower plate of the lower base of the pressure chamber contains three threaded holes distributed at equal distances, and a groove for placing an O-ring; The water pressure boosting / relief port has a switch valve outside the base and is connected to an external pressure pump through a pressure pipe; The drain outlet is also equipped with a switch valve outside the base. The switch valve can be opened to discharge the aqueous solution in the pressure chamber, and can also be used to fill the pressure chamber with water through the secondary channel. After it is filled, the switch valve is closed to form a closed space in the pressure chamber.

[0010] The heating pipe is fixed on the lower plate of the lower base of the pressure chamber by a heating pipe bracket, and the temperature of the heating pipe is adjusted to a preset value of the test by an external temperature controller, and the heat of the heating pipe is then transferred to the aqueous solution in the pressure chamber so that the aqueous solution reaches the preset value required by the test; The heating pipe bracket is equipped with a temperature sensor, which can monitor the temperature value of the aqueous solution in the pressure chamber in real time.

[0011] The visual water pressure chamber also includes a stainless steel pressure head and an annular extensometer; The stainless steel indenter is placed at each end of the geotechnical material sample, and the circumferential extensometer is installed in the middle of the geotechnical material sample to obtain the strain value of the sample in the circumferential direction; The wires involved in the heating tube and the circumferential extensometer are all led out through the outlet to the outside of the lower plate of the lower base of the pressure chamber and connected to the controller and the data acquisition instrument; The wire outlet is strictly sealed by sealant.

[0012] The upper plate of the pressure chamber lower base is connected to the lower plate of the pressure chamber lower base as a whole through a second high-strength stainless steel screw and an O-ring to form a closed space, thereby forming a visualized water pressure chamber.

[0013] A rheological test method for visualizing hydraulic-stress-temperature coupling, the test method is implemented by using the test device, and comprises the following steps: Step 1: Place a stainless steel pressure head at the center of the lower plate of the lower base of the pressure chamber, then place the geotechnical material sample on the stainless steel pressure head, and then place another stainless steel pressure head on the top of the geotechnical material sample to ensure that the geotechnical material sample and the stainless steel pressure heads at both ends are on the same axis; Step 2: Install the circumferential extensometer on the geotechnical material sample; Step 3: Place the O-ring in the groove of the lower plate of the lower base of the pressure chamber; Step 4: Connect the upper base of the pressure chamber, the high-strength transparent acrylic pressure chamber wall, the upper plate of the lower base of the pressure chamber and the first high-strength stainless steel screw into a whole, install it on the lower plate of the lower base of the pressure chamber, and fasten it with a high-strength stainless steel screw; Step 5: Push the force transfer rod downward through the axial pressure device to make the force transfer rod, the stainless steel pressure head and the geotechnical material sample in close contact, and there is a load less than or equal to 1kN; Step 6: Close the water pressure boost / pressure relief port, open the exhaust valve and drain port, inject water into the pressure chamber through the drain port, wait for water to come out of the exhaust valve, stop injecting water, and close the drain port; Step 7: Apply temperature to the heating pipe through the temperature controller, and when the temperature reaches the preset value, close the exhaust valve to simulate the environment of geotechnical materials greater than 0℃ and less than or equal to 100℃; Step 8: Open the water pressure boost / pressure relief port and inject water into the pressure chamber through the pressure pipe to achieve the purpose of applying water pressure; at the same time, the axial pressure device also applies axial load to make the geotechnical material sample reach a hydrostatic pressure equilibrium state; Step 9: Turn on the image acquisition device and start recording until the specimen is damaged; Step 10: Use the axial pressure controller and the water pressure controller to apply axial load and water pressure to the geotechnical material specimens to the preset values ​​through the axial pressure device and the water pressure boost / relief port respectively, and keep them unchanged within the required test time. At the same time, the temperature controller should also maintain the temperature at the preset value during the test time. In this way, the geotechnical material specimens are in a warm water pressure and axial pressure environment for a long time to realize the rheological test of the geotechnical specimens under the stress-hydraulic-temperature coupling.

[0014] The present invention has the following beneficial effects: 1. The present invention conducts rheological tests on geotechnical materials under stress-hydraulic-temperature coupling through an axial pressurizing device and a visualized water pressure chamber, and collects images of the entire test process through a geotechnical material fracture process image acquisition device. It not only obtains the deformation characteristics of the geotechnical materials under multi-field coupling conditions, but also obtains the entire process image of the geotechnical material destruction, which is of great significance for analyzing the destruction mechanism of geotechnical materials.

[0015] 2. The device and method provided by the present invention can realize that the rock and soil body is in a real water pressure and temperature environment, is simple and convenient to operate, and has broad engineering practice significance and application prospects.

[0016] 3. The present invention sets an O-ring groove on the lower plate of the pressure chamber lower base. After the O-ring is placed in the groove, when the lower plate of the pressure chamber lower base contacts the upper plate of the pressure chamber lower base, a good seal can be achieved to prevent the aqueous solution in the pressure chamber from overflowing.

[0017] 4. The present invention arranges three digital image high-speed cameras at equal distances around the outside of the visualized water pressure chamber, which can collect all-round surface change processes of geotechnical materials and realize three-dimensional images in subsequent image reconstruction.

[0018] 5. The present invention arranges switch valves on the outside of the water pressure boosting / relief port and the drain port, which can ensure that the pressure channel from inside to outside has good airtightness, and facilitate the operations of water injection, pressurization and drainage during the test, thereby improving work efficiency.

[0019] 6. The exhaust valve of the present invention is arranged on the upper base of the pressure chamber, which can ensure that the internal air is completely exhausted when water is injected into the pressure chamber, thereby improving the initial efficiency of applying water pressure to the interior.

[0020] 7. The inner wall of the pressure chamber of the present invention is made of high-strength transparent acrylic material, which can well resist the adverse effects of internal water pressure and temperature, and can also enable the digital image high-speed camera to collect high-quality images as much as possible to achieve visualization function. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is the overall device diagram of the present invention (two-dimensional).

[0023] Figure 2 Schematic diagram of the combination of the axial pressure device and the rock material fracture process image acquisition device (two-dimensional).

[0024] Figure 3 Schematic diagram of the pressure chamber for visualizing water pressure (2D).

[0025] Figure 4 Detailed enlarged view of the 2D schematic for visualizing the hydraulic pressure chamber (2D).

[0026] Figure 5 Front view of the lower base plate of the hydraulic pressure chamber for visualization.

[0027] Figure 6 Front view of the upper plate of the lower base of the hydraulic pressure chamber for visualization.

[0028] Figure 7 Visualize the top view of the hydraulic pressure chamber.

[0029] Figure 8 A top view of the lower base plate of the hydraulic pressure chamber for visualization.

[0030] Fig. 9 Schematic diagram of the pressure chamber for visualizing water pressure (3D).

[0031] Fig.10 Schematic diagram (3D) of the lower base plate of the hydraulic pressure chamber for visualization.

[0032] Fig.11 Schematic diagram (3D) of the upper plate of the lower base of the water pressure chamber for visualization.

[0033] In the figure: axial pressurizing device 1, image acquisition device 2, visualized water pressure chamber 3, upper base of pressure chamber 4, force transmission rod 5, high-strength transparent acrylic pressure chamber wall 6, stainless steel pressure head 7, first high-strength stainless steel screw 8, second high-strength stainless steel screw 9, water pressure boosting / pressure relief port 10, drain port 11, exhaust valve 12, upper plate of lower base of pressure chamber 13, geotechnical material sample 14, O-ring 15, circumferential extensometer 16, lower plate of lower base of pressure chamber 17, heating pipe 18, heating pipe bracket 19, outlet port 20. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0035] Embodiment 1: like Figure 1-11A rheological test device for visual hydraulic-stress-temperature coupling, comprising an axial pressure device 1 for providing an axial load to a geotechnical material and measuring the axial strain change value of the geotechnical material, an image acquisition device 2 for recording the fracture test process of the geotechnical material is arranged on the periphery of the axial pressure device 1, and a visual water pressure chamber 3 is arranged on the axial pressure device 1. The image acquisition device 2 is three industrial high-speed cameras, which are arranged around the geotechnical material, and each camera is arranged at an angle of 120° to each other. The visual water pressure chamber 3 comprises a lower plate 17 of the lower base of the pressure chamber, a lower plate 13 of the lower base of the pressure chamber is arranged on the top of the lower plate 17 of the lower base of the pressure chamber, a high-strength transparent acrylic pressure chamber wall 6 is arranged on the top of the high-strength transparent acrylic pressure chamber wall 6, a pressure chamber upper base 4 is arranged on the top of the high-strength transparent acrylic pressure chamber wall 6, and a force transmission rod 5 is arranged through the center of the pressure chamber upper base 4. By adopting the above-mentioned rheological test device in the present invention, the visualized water pressure chamber 3 and the axial pressurizing device 1 apply axial stress and annular hydraulic force to the geotechnical material, the aqueous solution in the visualized water pressure chamber is heated by the heating pipe, and the changing image of the geotechnical material in the whole process is collected by the rock material rupture process image acquisition device, not only the rheological deformation characteristics and basic mechanical parameters of the geotechnical material under the multi-field coupling conditions of stress field, seepage field and temperature field are tested, but also the changing law of the surface strain of the geotechnical material in the whole test process can be obtained; the device and method provided by the present invention can more realistically realize the multi-field fully coupled test conditions, are simple and convenient to operate, and have broad engineering practice significance and application prospects.

[0036] Furthermore, a sliding seal is adopted between the force transmission rod 5 and the upper base 4 of the pressure chamber; they can move up and down in the axial direction and have good sealing performance, being watertight and airtight.

[0037] Furthermore, an exhaust valve 12 is provided on the upper base 4 of the pressure chamber; the exhaust valve 12 is connected to the interior of the visual water pressure chamber 3; the exhaust valve 12 is threaded, and is closed when tightened and opened when loosened. Thus, the exhaust purpose can be achieved through the exhaust valve 12.

[0038] Furthermore, the pressure chamber upper base 4 is connected as a whole with the high-strength transparent acrylic pressure chamber wall 6 and the pressure chamber lower base upper plate 13 through the first high-strength stainless steel screw 8, thereby ensuring the reliability of assembly and connection strength between the components.

[0039] Furthermore, the contact parts between the pressure chamber upper base 4, the high-strength transparent acrylic pressure chamber wall 6 and the pressure chamber lower base upper plate 13 are coated with sealant, thereby preventing water leakage and air leakage.

[0040] Furthermore, the lower plate 17 of the lower base of the pressure chamber is provided with a water pressure boosting / relieving port 10, a drain port 11, a heating pipe 18, a heating pipe bracket 19, a wire outlet 20 and an O-ring 15; Furthermore, the lower plate 17 of the lower base of the pressure chamber contains three equidistantly distributed threaded holes and a groove for placing an O-ring 15; the above-mentioned O-ring 15 can achieve a good sealing effect. The O-ring is a silicone sealing ring with good high temperature resistance and sealing performance, and the outlet is sealed with epoxy resin.

[0041] Furthermore, the water pressure boosting / relief port 10 has a switch valve outside the base, and is then connected to an external pressure pump through a pressure pipe; Furthermore, the drain port 11 is also equipped with a switch valve outside the base. When the switch valve is opened, the aqueous solution in the pressure chamber can be discharged, and water can also be filled into the pressure chamber through the secondary channel. After it is filled, the switch valve is closed to form a closed space in the pressure chamber.

[0042] Furthermore, the heating tube 18 is fixed on the lower plate 17 of the lower base of the pressure chamber through a heating tube bracket 19, and the temperature of the heating tube 18 is adjusted to a preset value of the test through an external temperature controller. The heat of the heating tube 18 is then transferred to the aqueous solution in the pressure chamber so that the aqueous solution reaches the preset value required by the test.

[0043] Furthermore, the heating pipe bracket 19 is equipped with a temperature sensor, which can monitor the temperature value of the aqueous solution in the pressure chamber in real time.

[0044] Furthermore, gas is generated in the pressure chamber during the heating process, which indirectly increases the pressure in the pressure chamber. In order to ensure that the water pressure value in the pressure chamber is constant at a preset value, an external water pressure controller can perform automatic servo adjustment based on the pressure value fed back from the pressure chamber.

[0045] Furthermore, during the test, the temperature is first applied to make the aqueous solution reach a preset value, and then the water pressure is applied.

[0046] Furthermore, the visualized water pressure chamber 3 also includes a stainless steel pressure head 7 and an annular extensometer 16 .

[0047] Furthermore, in order to prevent the pressure chamber from depressurizing during the test, the high-strength stainless steel screws connecting the lower plate of the pressure chamber lower base and the upper plate of the pressure chamber lower base must be tightened firmly, and the drain port and exhaust valve must be in a closed state.

[0048] Furthermore, the stainless steel indenter 7 is placed at each end of the geotechnical material sample 14, and the circumferential extensometer 16 is installed in the middle of the geotechnical material sample 14 to obtain the strain value of the sample in the circumferential direction; Furthermore, the wires involved in the heating tube 18 and the circumferential extensometer 16 are led out through the outlet 20 to the outside of the lower base plate 17 of the pressure chamber and connected to the controller and the data acquisition instrument; Furthermore, the cable outlet 20 is strictly sealed by a sealant.

[0049] Furthermore, the upper plate 13 of the pressure chamber lower base is connected to the lower plate 17 of the pressure chamber lower base as a whole through the second high-strength stainless steel screw 9 and the O-ring 15 to form a closed space, thereby forming a visualized water pressure chamber 3.

[0050] Furthermore, by replacing the aqueous solution with a chemical solution, the hydraulic-stress-temperature-chemical coupling effect can be achieved.

[0051] Furthermore, the force transmission rod, the stainless steel pressure head and the geotechnical material must be kept on the same axis to prevent the geotechnical material from being eccentrically stressed.

[0052] Embodiment 2: A rheological test method for visualizing hydraulic-stress-temperature coupling, the test method is implemented by using the test device, and comprises the following steps: Step 1: Place a stainless steel pressure head 7 at the center of the lower plate 17 of the lower base of the pressure chamber, then place the geotechnical material sample 14 on the stainless steel pressure head 7, and then place another stainless steel pressure head 7 on the top of the geotechnical material sample 14 to ensure that the geotechnical material sample 14 and the stainless steel pressure heads 7 at both ends are on the same axis; Step 2: Installing a circumferential extensometer 16 on the geotechnical material sample 14; Step 3: Place the O-ring 15 in the groove of the lower plate 17 of the lower base of the pressure chamber; Step 4: Connect the pressure chamber upper base 4, the high-strength transparent acrylic pressure chamber wall 6, the pressure chamber lower base upper plate 13 and the first high-strength stainless steel screw 8 into a whole, install it on the pressure chamber lower base lower plate 17, and use high-strength stainless steel screws 9 for fastening connection; Step 5: Push the force transfer rod 5 downward through the axial pressure device 1, so that the force transfer rod 5, the stainless steel pressure head 7 and the geotechnical material sample 14 are in close contact, and there is a load of less than or equal to 1 kN; Step 6: Close the water pressure boost / pressure relief port 10, open the exhaust valve 12 and the drain port 11, and inject water into the pressure chamber through the drain port 11. When water comes out of the exhaust valve 12, stop injecting water and close the drain port 11. Step 7: Apply temperature to the heating pipe 18 through the temperature controller, and when the temperature reaches the preset value, close the exhaust valve 12; simulate the environment of the geotechnical material at a temperature greater than 0°C and less than or equal to 100°C; Step 8: Open the water pressure boosting / relief port 10 and inject water into the pressure chamber through the pressure pipe to achieve the purpose of applying water pressure; at the same time, the axial pressure device 1 also applies an axial load to make the geotechnical material sample 14 reach a hydrostatic pressure equilibrium state; Step 9: Turn on the image acquisition device 2 to start shooting and recording, and stop recording after the specimen is damaged; Step 10: Use an axial pressure controller and a water pressure controller to apply axial load and water pressure to the geotechnical material sample 14 to preset values ​​through the axial pressure device 1 and the water pressure boost / relief port 10 respectively, and keep them unchanged within the required test time. At the same time, the temperature controller should also maintain the temperature at the preset value within the test time, so that the geotechnical material sample 14 is in a warm water pressure and axial pressure environment for a long time, so as to realize the rheological test of the geotechnical sample under the stress-hydraulic-temperature coupling.

Claims

1. A rheological test device for visualizing hydraulic-stress-temperature coupling, characterized in that: The invention comprises an axial pressure device (1) for providing an axial load to a rock material and measuring the axial strain change value of the rock material, an image acquisition device (2) for recording the rock material rupture test process is arranged on the periphery of the axial pressure device (1), and a visual water pressure chamber (3) is arranged on the axial pressure device (1).

2. A rheological test device for visualizing hydraulic-stress-temperature coupling according to claim 1, characterized in that: The image acquisition device (2) is three industrial high-speed cameras, which are arranged around the rock material, and each camera is arranged at an angle of 120° to each other.

3. A rheological test device for visualizing hydraulic-stress-temperature coupling according to claim 1, characterized in that: The visualized water pressure chamber (3) comprises a pressure chamber lower base lower plate (17), a pressure chamber lower base upper plate (13) is arranged on the top of the pressure chamber lower base lower plate (17), a high-strength transparent acrylic pressure chamber wall (6) is arranged on the top of the pressure chamber lower base upper plate (13), a pressure chamber upper base (4) is arranged on the top of the high-strength transparent acrylic pressure chamber wall (6), and a force transmission rod (5) is arranged through the center of the pressure chamber upper base (4).

4. A rheological test device for visualizing hydraulic-stress-temperature coupling according to claim 3, characterized in that: A sliding seal is used between the force transmission rod (5) and the upper base (4) of the pressure chamber; An exhaust valve (12) is provided on the upper base (4) of the pressure chamber; The exhaust valve (12) is in communication with the interior of the visible water pressure chamber (3); the exhaust valve (12) is threaded and is in a closed state when tightened and in an open state when loosened.

5. A rheological test device for visualizing hydraulic-stress-temperature coupling according to claim 3, characterized in that: The pressure chamber upper base (4) is connected to the high-strength transparent acrylic pressure chamber wall (6) and the pressure chamber lower base upper plate (13) as a whole via a first high-strength stainless steel screw (8); The contact areas between the pressure chamber upper base (4), the high-strength transparent acrylic pressure chamber wall (6) and the pressure chamber lower base upper plate (13) are coated with sealant.

6. A rheological test device for visualizing hydraulic-stress-temperature coupling according to claim 3, characterized in that: The lower plate (17) of the lower base of the pressure chamber is provided with a water pressure boosting / relieving port (10), a water discharge port (11), a heating pipe (18), a heating pipe bracket (19), a wire outlet (20) and an O-ring (15); The lower plate (17) of the lower base of the pressure chamber has three threaded holes distributed at equal distances, and a groove for placing an O-ring (15); The water pressure boosting / relieving port (10) has a switch valve outside the base and is connected to an external pressure pump through a pressure pipe; The drain port (11) is also provided with an on-off valve outside the base. When the on-off valve is opened, the aqueous solution in the pressure chamber can be discharged. Water can also be filled into the pressure chamber through the secondary channel. When the pressure chamber is filled, the on-off valve is closed to form a closed space in the pressure chamber.

7. A rheological test device for visualizing hydraulic-stress-temperature coupling according to claim 6, characterized in that: The heating pipe (18) is fixed to the lower plate (17) of the lower base of the pressure chamber through a heating pipe bracket (19), and the temperature of the heating pipe (18) is adjusted to a preset test value through an external temperature controller, and the heat of the heating pipe (18) is then transferred to the aqueous solution in the pressure chamber so that the aqueous solution reaches the preset test value; The heating pipe bracket (19) is provided with a temperature sensor, which can monitor the temperature value of the aqueous solution in the pressure chamber in real time.

8. A rheological test device for visualizing hydraulic-stress-temperature coupling according to claim 6, characterized in that: The visual water pressure chamber (3) further comprises a stainless steel pressure head (7) and a circumferential extensometer (16); The stainless steel pressure head (7) is placed at each end of the geotechnical material sample (14), and the circumferential extensometer (16) is installed in the middle of the geotechnical material sample (14) to obtain the strain value of the sample in the circumferential direction; The wires involved in the heating tube (18) and the circumferential extensometer (16) are led out through the outlet (20) to the outside of the lower plate (17) of the lower base of the pressure chamber and connected to the controller and the data acquisition instrument; The wire outlet (20) is strictly sealed by means of a sealant.

9. A rheological test device for visualizing hydraulic-stress-temperature coupling according to claim 6, characterized in that: The upper plate (13) of the pressure chamber lower base is connected to the lower plate (17) of the pressure chamber lower base via a second high-strength stainless steel screw (9) and an O-ring (15) to form a whole, and form a closed space, thereby forming a visualized water pressure chamber (3).

10. A rheological test method for visualizing hydraulic-stress-temperature coupling, characterized in that: The test method is implemented by using the test device according to any one of claims 1 to 9, comprising the following steps: Step 1: Place a stainless steel pressure head (7) at the center of the lower plate (17) of the lower base of the pressure chamber, then place the geotechnical material sample (14) on the stainless steel pressure head (7), and then place another stainless steel pressure head (7) on the top of the geotechnical material sample (14), ensuring that the geotechnical material sample (14) and the stainless steel pressure heads (7) at both ends are on the same axis; Step 2: Install a circumferential extensometer (16) on the geotechnical material sample (14); Step 3: Place the O-ring (15) in the groove of the lower plate (17) of the lower base of the pressure chamber; Step 4: Connect the pressure chamber upper base (4), the high-strength transparent acrylic pressure chamber wall (6), the pressure chamber lower base upper plate (13) and the first high-strength stainless steel screw (8) into a whole, install it on the pressure chamber lower base lower plate (17), and use a high-strength stainless steel screw (9) to fasten it; Step 5: Push the force transmission rod (5) downward through the axial pressure device (1) so that the force transmission rod (5), the stainless steel pressure head (7) and the geotechnical material sample (14) are in close contact and a load of less than or equal to 1 kN exists; Step 6: Close the water pressure boost / pressure relief port (10), open the exhaust valve (12) and the drain port (11), and inject water into the pressure chamber through the drain port (11). When water starts to come out of the exhaust valve (12), stop injecting water and close the drain port (11). Step 7: Apply temperature to the heating pipe (18) through a temperature controller, and when the temperature reaches a preset value, close the exhaust valve (12); simulate the environment of the geotechnical material at a temperature greater than 0°C and less than or equal to 100°C; Step 8: Open the water pressure boost / pressure relief port (10) and inject water into the pressure chamber through the pressure pipe to achieve the purpose of applying water pressure; at the same time, the axial pressure device (1) also applies an axial load to make the geotechnical material sample (14) reach a hydrostatic pressure equilibrium state; Step 9: Open the image acquisition device (2) and start recording until the specimen is damaged and the recording stops; Step 10: An axial pressure controller and a water pressure controller are used to apply an axial load and water pressure to a preset value on the geotechnical material sample (14) through an axial pressure device (1) and a water pressure boost / relief port (10), respectively, and keep the pressure constant within the required test time. At the same time, the temperature controller is also required to maintain the temperature at a preset value within the test time. In this way, the geotechnical material sample (14) is in a water pressure and axial pressure environment with a temperature for a long time, so as to realize a rheological test of the geotechnical sample under the stress-hydraulic-temperature coupling effect.

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