A true triaxial sealed side plate suitable for high temperature and high pressure multi-physical field monitoring

Abstract

This invention relates to the field of true triaxial sealing plate technology, and discloses a true triaxial sealing side plate suitable for high-temperature, high-pressure, and multi-physics field monitoring. It includes a side loading plate, a connecting plate, an insulating mica plate, a pressure plate, and several hydraulic cylinders. The side loading plate has several mounting slots, and each hydraulic cylinder is located within one of these slots. The connecting plate is located at the output end of each hydraulic cylinder, the insulating mica plate is located at one end of the connecting plate, and the pressure plate is located at one end of the insulating mica plate. The output force of the hydraulic cylinders is transmitted step-by-step through the connecting plate and the insulating mica plate to the pressure plate, and then directly acts on the rock sample, achieving multi-point synchronous driving of the side loading plate and avoiding uneven force distribution on the rock sample during loading. Simultaneously, several different sensors are embedded in the pressure plate through slots and holes in the rock sample. The sensor cables are then led out through the chamfered gaps between adjacent pressure plates, preventing the cables from being directly exposed to the high-temperature, high-pressure, and high-pressure erosion environment, ensuring continuous and stable transmission of the cable signals.

Description

Technical Field

[0001] This invention relates to the field of true triaxial sealing plate technology, specifically to a true triaxial sealing side plate suitable for high temperature and high pressure multi-physics field monitoring. Background Technology

[0002] To accurately recreate the true triaxial stress, high temperature, and high confining pressure integrated service environment of deep strata and ensure the accuracy and reliability of rock mechanics tests, high-temperature and high-pressure rock breaking simulation devices have become core testing equipment in industries such as geological exploration and energy development. The sealing side plate, which integrates the pressurization module, is the core unit for stress loading and directly determines the simulation accuracy, loading stability, and test reliability of the device. The sealing side plate needs to have good sealing function under high temperature and high pressure to prevent excessive temperature leakage inside the test chamber. Currently, the pressurization module of existing sealing side plates mostly adopts single-cylinder independent loading, which easily leads to uneven force transmission and stress concentration. This not only causes local damage to rock samples and fails to truly simulate the actual service stress state of rocks in deep strata, but also affects the accuracy of test data. Therefore, we propose a true triaxial sealing side plate suitable for high-temperature and high-pressure multi-physics field monitoring to solve the above problems. Summary of the Invention

[0003] The present invention aims to provide a true triaxial sealing side plate suitable for high temperature and high pressure multi-physics field monitoring, in order to solve the problem that the pressurization module of the existing sealing side plate mostly adopts single cylinder independent loading, which easily leads to uneven force transmission and stress concentration.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a true triaxial sealing side plate suitable for high temperature and high pressure multi-physics field monitoring, characterized in that: it includes a side loading plate, a connecting plate, an insulating mica plate, a pressure plate, and several hydraulic cylinders. One end of the side loading plate is evenly provided with several mounting grooves that match the hydraulic cylinders. Each hydraulic cylinder is respectively located in the mounting groove. The connecting plate is located at the output end of each hydraulic cylinder. The insulating mica plate is located at the end of the connecting plate away from the hydraulic cylinders. The pressure plate is located at the end of the insulating mica plate away from the connecting plate.

[0005] Preferably, as an improvement, one end of the side loading plate is set as an arc surface, and the end of the side loading plate away from the arc surface is set as a plane, with each mounting slot evenly opened on the plane.

[0006] Preferably, as an improvement, the arc surface of each side loading plate is provided with a placement plane.

[0007] Preferably, as an improvement, the side loading plate has hydraulic oil channels that are connected to each mounting slot, and the hydraulic oil channels are connected to each hydraulic cylinder.

[0008] Preferably, as an improvement, a probe hole is provided at the end of the pressure plate away from the heat-insulating mica plate, and an acoustic emission probe is installed in the probe hole. The acoustic emission probe can collect the acoustic emission signal of the rock sample in real time during the high temperature and high pressure loading process. By analyzing the signal, the timing of rock crack initiation, propagation and failure can be obtained, providing accurate experimental data for the study of rock breaking mechanism.

[0009] Preferably, as an improvement, a cable management groove is provided at the end of the pressure plate away from the heat-insulating mica plate. The cables of the acoustic emission probe or various sensors can be stored in the cable management groove to avoid the cables being directly exposed to the high temperature and high pressure test environment, prevent the cables from being eroded by the high pressure medium and aged by high temperature baking, and ensure the stability of signal transmission.

[0010] Preferably, as an improvement, an oil delivery channel is provided inside the pressure plate. The oil delivery channel can deliver high-temperature heat transfer oil. By delivering high-temperature heat transfer oil that matches the temperature of the test chamber into the pressure plate through the oil delivery channel, the temperature of the pressure plate can be kept consistent with the test temperature of the rock sample, avoiding the problem of temperature difference in the rock sample and uneven heating of the rock, and truly restoring the temperature environment of deep strata rocks.

[0011] The beneficial effects of this solution are as follows: By opening several mounting slots on the side loading plate that match the hydraulic cylinders, the output force of the hydraulic cylinders is transmitted to the pressure plate step by step through the connecting plate and the heat-insulating mica plate, and then the pressure plate directly acts on the rock sample. Compared with the existing simple structure of independent loading by a single cylinder, the uniform arrangement of several hydraulic cylinders realizes multi-point synchronous driving of the side loading plate, avoiding uneven force during pressure loading of the rock sample. At the same time, the layered structure, through the transition connection of the connecting plate and the heat-insulating mica plate, evenly distributes the concentrated force of the hydraulic cylinder to the entire contact surface of the pressure plate, avoiding the problem of stress concentration. The arc surface of the side loading plate has a placement plane, which not only retains the advantages of the arc surface in buffering thermal deformation and dispersing stress, but also allows the side loading plate to be placed stably on the ground or transport tool, avoiding the tilting of the sealed side plate due to the inability of the arc surface to stably contact the ground. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the side loading plate and pressurizing assembly according to Embodiment 1 of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the side loading plate in Embodiment 1 of the present invention; Figure 3 This is a three-dimensional structural diagram of the pressure plate in Embodiment 1 of the present invention; Figure 4 This is a three-dimensional structural diagram of the cylinder and lower cover plate in Embodiment 2 of the present invention; Figure 5 This is a three-dimensional structural diagram of the bottom loading plate and pressurizing assembly in Embodiment 2 of the present invention; Figure 6 This is a three-dimensional structural diagram of the side loading plate, pressurizing assembly, and fixing block according to Embodiment 2 of the present invention; Figure 7 This is a three-dimensional structural diagram of the fixing block in Embodiment 2 of the present invention; Figure 8 This is a three-dimensional structural diagram of the side loading plate and fixing block in Embodiment 2 of the present invention; Figure 9 This is a front sectional view of the fixing mechanism, drilling mechanism, and support in Embodiment 3 of the present invention; Figure 10 This is a front sectional view of the fixing mechanism and drilling mechanism in Embodiment 3 of the present invention; Figure 11 This is an exploded view of the fixing mechanism and drilling mechanism in Embodiment 3 of the present invention; Figure 12 for Figure 11 Exploded view of the structure from below. Detailed Implementation

[0013] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: cylinder 1, lower cover plate 2, bottom loading plate 3, side loading plate 4, fixing block 5, arc surface 6, transition surface 7, placement plane 8, fixing groove 9, step 10, limiting block 11, limiting groove 12, hydraulic cylinder 13, connecting plate 14, heat-insulating mica plate 15, pressure plate 16, oil delivery channel 17, probe hole 18, cable management groove 19, bracket 001, rock 002, outer cover plate 003, inner cover plate 004, drill rod 005, Inlet pipe; 006, Outlet pipe; 007, Circulation inlet; 008, Circulation outlet; 009, End cap; 010, Sealing ring; 011, Inner cavity; 012, Side channel; 013, First sealing groove; 014, Second sealing groove; 015, Third sealing groove; 016, Pressure plate; 017, Limiting groove; 018, First drill hole; 019, Pressure-bearing pipe; 020, Fixing hook; 021, Displacement notch; 022, Drive device; 023, Drill bit; 024, Second drill hole; 025.

[0014] Example 1 Example 1 is basically as shown in the appendix. Figures 1-3 As shown, Figure 1 The diagram shows a true triaxial sealing side plate suitable for high-temperature, high-pressure, multi-physics field monitoring, comprising a side loading plate 4 and a pressurizing assembly. The pressurizing assembly includes a connecting plate 14, an insulating mica plate 15, a pressure plate 16, and several hydraulic cylinders 13, as shown. Figure 2The lower end of the side loading plate 4 shown is flat, and the upper end is an arc surface 6. A placement plane 8 is provided in the middle of the arc surface 6 of the side loading plate 4. The placement plane 8 retains the advantages of the arc surface 6 in buffering thermal deformation and dispersing stress, and also allows the side loading plate 4 to be placed stably on the ground or on a transport fixture, preventing the sealing side plate from tipping over due to the arc surface 6 not being able to stably contact the ground. The plane of the side loading plate 4 is evenly provided with several mounting slots that match the hydraulic cylinder 13. In this embodiment, there are 9 mounting slots, arranged in a 3x3 pattern. The array is located at the top of the plane. Each hydraulic cylinder 13 is fixedly installed in its corresponding mounting slot. The side loading plate 4 has hydraulic oil channels connected to each hydraulic cylinder 13. The connecting plate 14 is fixedly installed to the output end of each hydraulic cylinder 13 by screws. The heat-insulating mica plate 15 is fixedly installed to the front end of the connecting plate 14 by screws. The pressure plate 16 is fixedly installed to the front end of the heat-insulating mica plate 15 by screws. The four sides of the front end of the pressure plate 16 are chamfered. Figure 3 The pressure plate 16 shown has four probe holes 18 evenly spaced at its front end. Acoustic emission probes are fixedly installed in the probe holes 18 by screws. These probes can collect acoustic emission signals from the rock 002 sample during high-temperature and high-pressure loading in real time. Other sensors can also be installed in the probe holes 18 to detect rock sample test data. Signal analysis can reveal the timing of crack initiation, propagation, and failure in the rock 002, providing accurate experimental data for rock breaking mechanism research. The pressure plate 16 has symmetrically arranged cable management grooves 19 at its front end, with each groove connected in series with two probe holes 18. Cables for the acoustic emission probes or various sensors can be stored in the cable management grooves 19, preventing direct exposure to the high-temperature and high-pressure test environment and preventing erosion and aging by the high-pressure medium, thus ensuring the stability of signal transmission. The pressure plate 16 has an oil delivery channel 17 that can transport high-temperature heat transfer oil. In this embodiment, the oil inlet and outlet of the oil delivery channel 17 are both located at the upper end of the pressure plate 16.

[0015] The specific implementation process is as follows: By opening several mounting slots on the side loading plate 4 that match the hydraulic cylinders 13, the output force of the hydraulic cylinders 13 is transmitted step by step to the pressure plate 16 through the connecting plate 14 and the heat-insulating mica plate 15, and then the pressure plate 16 directly acts on the rock 002 sample. Compared with the existing simple structure of independent loading by a single cylinder, the uniform arrangement of several hydraulic cylinders 13 realizes multi-point synchronous driving of the side loading plate 4, avoiding uneven force during pressure loading of the rock 002 sample. At the same time, the layered structure, through the transition connection of the connecting plate 14 and the heat-insulating mica plate 15, evenly distributes the concentrated force of the hydraulic cylinders 13 to the entire contact surface of the pressure plate 16, avoiding stress concentration problems. The arc surface 6 of the side loading plate 4 is provided with a placement plane 8, which not only retains the advantages of the arc surface 6 in buffering thermal deformation and dispersing stress, but also allows the side loading plate 4 to be placed stably on the ground or on the transfer tool through the placement plane 8, avoiding the tilting of the sealed side plate due to the inability of the arc surface 6 to stably contact the ground.

[0016] Example 2 Example 2 is basically as shown in the appendix. Figures 4-8 As shown, Example 2 is based on Example 1: Figure 4 The cylinder 1 and lower cover plate 2 shown are fixedly installed to the lower end of the cylinder 1 by several screws. The cylinder also includes a bottom loading plate 3, four side loading plates 4, and a fixing block 5. The bottom loading plate 3 and the four side loading plates 4 are all made of high-strength special alloys. Figure 5 The bottom loading plate 3 shown is rectangular and is fixedly installed on the upper end of the lower cover plate 2 by screws, as shown. Figure 6 The four side loading plates 4 shown are located around the bottom loading plate 3, and the four fixing blocks 5 are located at the four corners of the bottom loading plate 3. The side walls of adjacent side loading plates 4 abut against the side walls of fixing blocks 5. The fixing blocks 5 are made of high-strength carbon steel. The outer wall of the side loading plate 4 is set as an arc surface 6, and the inner wall of the side loading plate 4 is set as a plane. Both side walls of the side loading plate 4 are perpendicular to the plane, and the side walls of the fixing blocks 5 are tightly fitted with the side walls of the two adjacent side loading plates 4. The outer wall of the fixing blocks 5 is provided with a transition surface 7 that matches the arc surface 6 of the two adjacent side loading plates 4. The arc surface 6 of the side loading plate 4 and the transition surface 7 of the fixing blocks 5 are both provided with a placement plane 8 in the middle. This retains the advantages of the arc surface 6 and the transition surface 7 in buffering thermal deformation and dispersing stress, and the placement plane 8 allows the side loading plates 4 and fixing blocks 5 to be placed stably on the ground or on the transfer fixture, avoiding tipping caused by the arc surface 6 and the transition surface 7 not being able to stably contact the ground. Figure 7The fixing block 5 shown has symmetrical fixing grooves 9 on its lower left and right sides. The fixing block 5 is fixedly installed on the upper end of the lower cover plate 2 through the cooperation of the fixing grooves 9 and the screw. The left and right side walls of the fixing block 5 are provided with steps 10, which can support the lower end of the side loading plate 4. The left and right side walls of the fixing block 5 are integrally formed with limit blocks 11, and the cross-section of the limit blocks 11 is set as a right triangle. The front end of the limit block 11 and the inclined surface of the limit blocks 11 on both sides are located on the same horizontal plane. Figure 8 The side loading plate 4 shown has symmetrically provided limiting grooves 12 on its left and right side walls that match the limiting block 11, and the right-angled side of the limiting block 11 is in close contact with one side of the limiting groove 12.

[0017] In existing high-temperature and high-pressure rock mechanics testing equipment, the connection between the fixed block 5 and the side loading plate 4 is mostly a straight butt joint. However, under high-temperature conditions, the fixed block 5 and the side loading plate 4 undergo thermal expansion and contraction. The straight butt joint structure generates gaps due to thermal deformation, leading to loading offset and sealing failure during pressure loading, resulting in severe heat leakage from the test chamber. In this application, the contact surface between the fixed block 5 and the side wall of the side loading plate 4 is parallel to the direction of the loading pressure. This ensures that the high confining pressure provided by the pressure assembly of the side loading plate 4 is completely transferred to the rock sample along the loading direction, preventing tilted or perpendicular force components from directly acting on the fixed block 5. This avoids problems such as deformation and cracking caused by the fixed block 5 bearing lateral loads.

[0018] Each side loading plate 4 and the top of the bottom loading plate 3 are equipped with a pressurizing component. The specific installation structure is the same as that of the pressurizing component in Embodiment 1, and will not be described in detail here.

[0019] By setting up a bottom loading plate 3, four side loading plates 4, and a fixing block 5, and abutting and cooperating two adjacent side loading plates 4 with the fixing block 5, a closed-loop confining pressure loading structure is formed. With the synchronous loading of the plane of each side loading plate 4 and the pressure component at the upper end of the bottom loading plate 3, the cubic rock sample is subjected to all-round and uniform force transmission, avoiding premature sample damage caused by local stress concentration. This ensures that the rock sample is in a uniform stress environment consistent with the deep strata, greatly improving the authenticity and accuracy of the test data. At the same time, the end of the side loading plate 4 facing away from the bottom loading plate 3 is set as an arc surface 6, and the outer wall of the fixing block 5 is provided with a transition surface 7 that matches the arc surface 6. This makes the four side loading plates 4 and the fixing block 5 form a cylindrical structure, which not only reduces stress loss between structures during loading and avoids local stress concentration, but also reduces deformation interference caused by thermal expansion and contraction of the structure under high temperature environment, ensuring the stability and loading accuracy of the equipment structure under high temperature and high confining pressure coupling environment.

[0020] Example 3 Example 3 is basically as shown in the appendix. Figures 9-12As shown, Embodiment 3, based on Embodiment 2, further includes a fixing mechanism and a drilling mechanism; like Figure 9 As shown, the fixing mechanism includes a bracket 001, a cylinder 1 is bolted to the bracket 001, the cylinder 1 is used to fix a rectangular rock 002, an outer cover plate 003 is bolted to the cylinder 1, a support notch is opened at the upper end of the inner side of the cylinder 1, and an inner cover plate 004 is supported on the support notch; the drilling mechanism includes a drill rod 005, an inlet pipe 006 and an outlet pipe 007 bolted from top to bottom.

[0021] like Figure 10 As shown, the inlet pipe 006 is equipped with a circulation inlet 008, which is connected to a circulation booster pump. The circulation booster pump is used to pressurize and pump drilling fluid into the inlet pipe 006. The outlet pipe 007 is equipped with a circulation outlet 009. Figures 10-12 As shown, a sealing unit is provided between the inlet pipe 006 and the outlet pipe 007. The sealing unit includes an end cap 010, which is bolted to the lower surface of the inlet pipe 006. A vertical through hole is opened on the inner side of the end cap 010, and several sealing rings 011 are embedded in the inner side of the through hole of the end cap 010. The sealing rings 011 are close to the outer side of the drill pipe 005, thereby preventing the drilling fluid in the outlet pipe 007 from entering the inlet pipe 006. The drill bit 024 is connected to the lower end of the drill pipe 005. The drill pipe 005 has an inner cavity 012 that extends through the lower end of the drill pipe 005. The drill pipe 005 passes through the inlet pipe 006, the sealing unit, and the outlet pipe 007 in sequence. A side channel 013 is opened on the drill pipe 005, which connects the inlet pipe 006 and the inner cavity 012. The drilling medium passes through the inlet pipe 006, the side channel 013, the inner cavity 012 of the drill pipe 005, the surface of the rock 002, and the outlet pipe 007 in sequence to complete the circulation.

[0022] A pressure plate 017 is supported on the rock 002. A first sealing groove 014 is formed on the lower surface of the pressure plate 017, and a limiting groove 018 is formed on the upper surface of the pressure plate 017. A first drill hole 019 is formed at the bottom of the limiting groove 018, penetrating the lower surface of the pressure plate 017. A pressure-bearing pipe 020 is installed inside the limiting groove 018, with its upper surface protruding relative to the limiting groove 018. A second sealing groove 015 and a third sealing groove 016 are formed on the outer side of the pressure-bearing pipe 020. The second sealing groove 015 is located between the pressure-bearing pipe 020 and the limiting groove 018. The upper end of the pressure-bearing pipe 020 passes through an inner cover plate 004, and the pressure-bearing pipe 020 and the inner cover plate 004 both face outwards. The cover plate 003 provides support, and the third sealing groove 016 is located between the pressure-bearing pipe 020 and the inner cover plate 004. Because the height of the rock 002 sample cannot be guaranteed to be completely accurate during the manufacturing process, it is impossible to ensure that the lower surfaces of the pressure-bearing pipe 020 and the outer cover plate 003 are completely flush. If the height of the rock 002 is greater than the design value (even if it is greater, the difference is very small), the pressure-bearing pipe 020 will press against the outer cover, easily damaging it. In this design, an inner cover plate 004 is added. After the outer cover plate 003 presses down on the pressure-bearing pipe 020, the inner cover plate 004 will provide support for the outer cover plate 003, thus avoiding excessive local pressure and protecting the outer cover plate 003. A second drill hole 025 is opened on the outer cover plate 003, and the first drill hole 019, the pressure-bearing pipe 020, the second drill hole 025, and the outlet pipe 007 are connected sequentially.

[0023] The first sealing groove 014, the second sealing groove 015, and the third sealing groove 016 each contain a sealing ring 011 (not shown in the figure). In this embodiment, the sealing ring 011 is embedded in the corresponding sealing groove. The drill pipe 005 has an annular fixing groove 9 on its outer side, which houses an annular fixing hook 021. The fixing hook 021 is installed by dividing it into two arc-shaped structures. These two arc-shaped structures fit together on the outer side of the drill pipe 005, and their ends are bolted together to form the fixing hook 021. Figure 12 As shown, the fixed hook 021 has several clearance notches 022 on its outer circumference, and the fixed hook 021 is accommodated in the outlet pipe 007; the drill rod 005 is longitudinally slidably arranged in the inlet pipe 006, the sealing unit and the outlet pipe 007. During the drilling process of the drill rod 005, after the fixed hook 021 descends with the drill rod 005 to below the circulation outlet 009, the drill cuttings enter the circulation outlet 009 through the clearance notches 022.

[0024] During the test, the waveguide of the millimeter-wave device was inserted into the upper end of the drill rod 005. The drive device 023 was used to drive the drill rod 005 to rotate and move downward. The drive device 023 is existing technology and will not be described in detail.

[0025] After the test, if drill cuttings remain on the drill bit 024 at the lower end of the drill rod 005, the drill bit 024 may not be able to pass through the sealing unit at the lower end of the inlet pipe 006. Therefore, in this solution, a fixing hook 021 is set. First, remove the bolt between the inlet pipe 006 and the outlet pipe 007, then pull the upper end of the drill rod 005. The drill rod 005 drives the sealing unit and the inlet pipe 006 to move upward together through the fixing hook 021. Finally, the drill rod 005 is pulled out from the lower end of the inlet pipe 006. This setting is convenient and quick, avoiding the situation where the drill bit 024 cannot pass through the inlet pipe 006.

[0026] The lower sidewall of the borehole is simulated by inlet pipe 006 and outlet pipe 007, so as to ensure that both millimeter waves and drilling media are transmitted along the borehole, so as to more closely approximate the actual borehole conditions, and then analyze the influence of the drilling media on the millimeter waves. The drilling media is usually drilling fluid.

[0027] In millimeter-wave drilling, if both millimeter-wave drilling and drilling fluid are used to remove drill cuttings, the drilling fluid will affect the destructive effect of the millimeter waves, creating a conflict and reducing drilling efficiency. Therefore, this test combines traditional rotary drilling and millimeter-wave drilling, using drill pipe 005. A drill bit 024 can be added to the end of drill pipe 005, and the lower end of the waveguide of the millimeter-wave equipment can be inserted to the end of drill pipe 005. First, millimeter waves are used to create cracks in rock 002, and then the drill bit 024 is used to quickly break through rock 002. In this way, the requirements for the destructive effect of millimeter waves are lower, which not only improves drilling efficiency but also reduces the wear of drill bit 024, reduces the frequency of drill bit 024 replacement, and improves drilling efficiency.

[0028] In traditional rotary drilling, the cuttings are essentially ground into powder, and the drill cuttings are usually in powder form, making them easy to clean. However, because the destructive mechanism in this test has changed, the drill cuttings are usually fragments. In this test, the test object is usually rock 002, which is usually surrounded by other equipment, such as stress testing equipment and true triaxial fixation equipment used to simulate real stress. If fragments fall into these devices, it will increase the wear of these devices and reduce their lifespan. In addition, under normal pressure, the drilling fluid and drill cuttings may combine to form a viscous substance, making it difficult to directly remove the drill cuttings from the hole. As the pressure inside the hole gradually increases, the drill cuttings may burst out, which can easily cause safety accidents.

[0029] Therefore, in this scheme, the drilling fluid adopts a closed circulation structure. After the drilling fluid flows out from the end of the drill pipe 005, it directly carries away the drill cuttings on the rock surface and then flows out through the outlet pipe 007. The drill cuttings will not enter other equipment throughout the process. Moreover, due to the closed setting, it is convenient to use a booster pump to increase the pressure of the drilling fluid, so as to carry away the stubborn drill cuttings in the borehole.

[0030] In the prior art, drilling fluid typically flows from the top of drill pipe 005 into the drill pipe 005 and then flows down into a collection channel. In this solution, the side channel 013 on the drill pipe 005 connects the inlet pipe 006 to the inner cavity 012 of the drill pipe 005, so that the drilling medium does not need to occupy the top space of the drill pipe 005 when injected, thus reserving space for the installation and operation of millimeter-wave equipment at the top of the device and resolving the conflict in spatial arrangement.

[0031] In this embodiment, a hole is made on the outer wall of the rock sample 1 cm away from the plane of the adjacent side wall. An optical fiber or stress sheet is embedded in the hole, and then the hole is filled with cement or clay. Finally, the cable for detecting the optical fiber or stress sheet is led out through the gap formed by the chamfer between the adjacent pressure plates 16. For artificial rock samples, the optical fiber or stress sheet can be embedded in the sample during sample preparation.

[0032] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A true triaxial sealing side plate suitable for high-temperature and high-pressure multi-physics field monitoring, characterized in that: It includes a side loading plate, a connecting plate, an insulating mica plate, a pressure plate, and several hydraulic cylinders. One end of the side loading plate is evenly provided with several mounting slots that match the hydraulic cylinders. Each hydraulic cylinder is located in a mounting slot. The connecting plate is located at the output end of each hydraulic cylinder. The insulating mica plate is located at the end of the connecting plate away from the hydraulic cylinders. The pressure plate is located at the end of the insulating mica plate away from the connecting plate.

2. A true triaxial sealing side plate suitable for high-temperature and high-pressure multi-physics field monitoring according to claim 1, characterized in that: One end of the side loading plate is set as an arc surface, and the end of the side loading plate away from the arc surface is set as a flat surface, with each mounting slot evenly opened on the flat surface.

3. A true triaxial sealing side plate suitable for high-temperature and high-pressure multi-physics field monitoring according to claim 2, characterized in that: Each side loading plate has a placement plane on its arc surface.

4. A true triaxial sealing side plate suitable for high-temperature and high-pressure multi-physics field monitoring according to claim 3, characterized in that: The side loading plate has hydraulic oil channels that are connected to each mounting slot, and the hydraulic oil channels are connected to each hydraulic cylinder.

5. A true triaxial sealing side plate suitable for high-temperature and high-pressure multi-physics field monitoring according to claim 4, characterized in that: A probe hole is provided at the end of the pressure plate away from the heat-insulating mica plate, and an acoustic emission probe is installed in the probe hole.

6. A true triaxial sealing side plate suitable for high-temperature and high-pressure multi-physics field monitoring according to claim 5, characterized in that: A cable management groove is provided at the end of the pressure plate away from the heat-insulating mica plate.

7. A true triaxial sealing side plate suitable for high-temperature and high-pressure multi-physics field monitoring according to claim 6, characterized in that: The pressure plate has an oil delivery channel that can transport high-temperature heat transfer oil.

Images