Deep geophysical mechanics test system geothermal experiment cabin

Abstract

The present application relates to a deep geophysical mechanics test system geothermal experiment cabin, including cabin body and six butt pressure heads, the cabin body includes six direction heating panels, the heating panel is internally provided with an electric heating element; six butt pressure heads are respectively installed in the through hole of one of the heating panels and can be axially moved relative to the cabin body; a high elasticity pressure box is operatively arranged in the cabin body, the high elasticity pressure box includes six pressure heads, the six pressure heads are connected together by elastic sheets to form a sample space, the six pressure heads are respectively butt-jointed with one of the butt pressure heads, and the pressure head is provided with a temperature sensor and / or a heat flow sensor. The cabin body of the present application can be butt-jointed with a loading system and a high elasticity pressure box, the loading system force can be transmitted to the sample, the sample can be provided with a high temperature environment, and the sample temperature can be detected, fed back and adjusted in real time. A matched triaxial six-way stress loading system is used, and the reservoir rock mechanics behavior test under real-time high temperature can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rock mechanical behavior testing, in particular to a geothermal experiment cabin of a deep geophysical mechanics testing system. BACKGROUND

[0002] China is in the stage of accelerating industrialization and urbanization, and the demand for resources is increasing. The resources in the shallow part of the earth have gradually exhausted. A large amount of resources and energy are stored in the deep earth, deep sea and deep space. Therefore, the current is gradually transferring to the deep part.

[0003] With the increasing demand for deep earth energy, the requirements for various performance indicators of deep rock are also increasing. How to improve the accuracy of the test and make the experimental data more truly reflect the mechanical properties of the material in the actual application scene is particularly prominent. The importance of mechanical property indicators at very high temperatures is self-evident. However, many existing technologies cannot realize real-time mechanical behavior testing of reservoir rocks under high-temperature environment, especially under true triaxial stress, resulting in distorted experimental data. SUMMARY

[0004] The present application provides a geothermal experiment cabin of a deep geophysical mechanics testing system, which can be matched with a multifunctional test loading system.

[0005] The present application is achieved by the following technical solutions:

[0006] The geothermal experiment cabin of the deep geophysical mechanics testing system provided by the present application includes a cabin body of a hexahedral structure and six docking pressure heads. The cabin body includes six heating panels in different directions, and the heating panels are internally provided with electric heating elements. The six docking pressure heads are located in the X-axis, Y-axis and Z-axis directions in pairs. The six docking pressure heads are respectively installed in the through holes of one of the heating panels and can move axially relative to the cabin body.

[0007] In particular, the cabin body further includes an integrally manufactured outer cubic frame, and the six heating panels are respectively installed in the six directions of the outer cubic frame. Each heating panel is externally provided with an elastic plate, and the two ends of the elastic plate are movably connected with the outer cubic frame. The elastic plate and the heating panel are provided with coaxial through holes, and the docking pressure head is installed in the through holes of the elastic plate and the heating panel. The docking pressure head and the elastic plate are fixed together.

[0008] Optionally, the heating panel has the following two types:

[0009] The first type is that the plate body of the heating panel is integrally manufactured, and the outer surface of the heating panel is provided with an adaptive plate groove corresponding to the position of the elastic plate, so that there is a gap between the elastic plate and the outer surface of the heating panel.

[0010] The second, the plate body of the heating panel is divided into three parts manufactured independently, namely, a first plate, a second plate and a third plate, the first plate, the second plate and the third plate are assembled together in sequence to form the heating panel, the second plate is located between the first plate and the third plate, the first plate and the third plate are fixedly connected with the outer cubic frame, and the electric heating element is arranged on the first plate and the third plate.

[0011] The second plate is matched with an elastic plate, the elastic plate is located outside the second plate, the elastic plate and the second plate are provided with coaxial through holes, and a butt pressure head is arranged in the through holes of the elastic plate and the second plate.

[0012] Optionally, the outer surface of the second plate is lower than the first plate and the third plate to form a plate groove matched with the elastic plate, and the elastic plate is arranged in the plate groove; the second plate is slidingly matched with the first plate and the third plate, the first plate and the third plate are provided with limiting steps for preventing the second plate from sliding outward, and the second plate is provided with steps matched with the limiting steps on both sides.

[0013] In particular, the elastic plate is provided with a strip-shaped notch at both ends, the outer cubic frame is provided with matched screws at positions corresponding to the strip-shaped notches, and the elastic plate is clamped on the screws through the strip-shaped notches at both ends.

[0014] Optionally, the deep geophysical mechanics test system geothermal experiment cabin further comprises a high-elasticity pressure box, which is operatively arranged in the cabin body; the high-elasticity pressure box comprises elastic sheets and six pressure heads, the six pressure heads are connected together by at least eight elastic sheets to form a sample space for placing a sample, and the six pressure heads are respectively butted against one of the butt pressure heads; the pressure head is provided with a temperature sensor and / or a heat flow sensor.

[0015] Optionally, the pressure head is rectangular, and six pressure heads are connected together by twelve elastic sheets, and the periphery of each pressure head is connected with four pressure heads around by one elastic sheet.

[0016] In particular, at least one displacement detection mechanism is arranged between two pressure heads in the X-axis direction; at least one displacement detection mechanism is arranged between two pressure heads in the Y-axis direction; and at least one displacement detection mechanism is arranged between two pressure heads in the Z-axis direction. X, Y and Z direction sample deformation monitoring can be performed.

[0017] Optionally, the displacement detection mechanism comprises a first connecting seat, a second connecting seat, a first leading straight rod, a second leading straight rod, a sensor mounting block and a displacement sensor.

[0018] The first connecting seat and the second connecting seat are arranged on two pressing heads on the same shaft respectively, the first leading straight rod and the second leading straight rod are parallel, one end of the first leading straight rod is fixedly connected with the first connecting seat, one end of the second leading straight rod is fixedly connected with the second connecting seat, the other end of the first leading straight rod is connected with the sensor mounting block, the displacement sensor is arranged on the sensor mounting block, the detection end of the displacement sensor is matched with the other end of the second leading straight rod, and the two are connected or not connected, and the displacement sensor is led out to the outside of the cabin body through the first leading straight rod. The displacement sensor is led out through the leading straight rod, so that the influence of high temperature on the displacement sensor can be avoided, and the measurement accuracy can be ensured.

[0019] Optionally, the front end of the at least one pressing head is provided with a heating plate, and the heating plate is internally provided with an electric heating element.

[0020] Preferably, the front end of each pressing head is provided with a heating plate.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1. The cabin body of the present application can be connected with a triaxial six-direction stress loading system or a high-elasticity pressure box, the loading system force can be transmitted to the sample, and a high-temperature environment can be provided for the sample, and when the triaxial six-direction stress loading system is used, the reservoir rock mechanical behavior test under real-time environment can be realized, and the accuracy of the test can be improved.

[0023] 2. The high-elasticity pressure box of the present application can place a cubic sample, the pressing heads in six directions can uniformly transmit the pressure to the sample from six directions, and the temperature of the sample under test can be detected, fed back and adjusted.

[0024] 3. The present application can monitor the deformation of the sample in X, Y and Z directions.

[0025] 4. The displacement detection mechanism of the present application can realize displacement monitoring in a high-temperature environment. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings described herein are used to provide further understanding of the embodiments of the present application, constitute a part of the present application, and do not constitute a limitation to the embodiments of the present application.

[0027] Figure 1 is a three-dimensional view of the geothermal experimental cabin of the deep geophysical mechanics test system in the embodiment;

[0028] Figure 2 is a front view of the geothermal experimental cabin of the deep geophysical mechanics test system in the embodiment;

[0029] Figure 3 is Figure 2 a sectional view at A-A in the embodiment;

[0030] Figure 4 is Figure 2 is a sectional view at G-G in

[0031] Figure 5 is a three-dimensional view of the outer cube frame in the embodiment;

[0032] Figure 6 is a three-dimensional view of the first heating panel in the embodiment;

[0033] Figure 7 is a three-dimensional view of the plate body of the first heating panel in the embodiment;

[0034] Figure 8 is a three-dimensional view of the elastic plate in the embodiment;

[0035] Figure 9 is a three-dimensional view of the second heating panel in the embodiment;

[0036] Figure 10 is a three-dimensional view of the plate body of the second heating panel in the embodiment;

[0037] Figure 11 is a side view of the plate body of the second heating panel in the embodiment;

[0038] Figure 12 is a three-dimensional view of the high-elasticity pressure box when placed in the cabin in the embodiment;

[0039] Figure 13 is a sectional view of the high-elasticity pressure box when placed in the cabin in the embodiment;

[0040] Figure 14 is a three-dimensional view of the high-elasticity pressure box when equipped with a displacement detection mechanism in the embodiment;

[0041] Figure 15 is a three-dimensional view of the high-elasticity pressure box in the embodiment;

[0042] Figure 16 is a sectional view of the high-elasticity pressure box in the embodiment;

[0043] Figure 17 is a three-dimensional view of the displacement detection mechanism in the embodiment;

[0044] Figure 18 is a schematic view of the displacement detection mechanism connected to two pressure heads in the same axial direction in the embodiment;

[0045] Figure 19 is a sectional view of the high-elasticity pressure box when at least one pressure head is equipped with a heating plate in the embodiment;

[0046] Figure 20 is a sectional view of the pressure head connected to the heating plate in the embodiment;

[0047] Figure 21 is a three-dimensional view of the hot plate in the example. DETAILED DESCRIPTION

[0048] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0050] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. It should be noted that each embodiment in the present specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between each embodiment can be referred to each other.

[0051] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0052] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] As Figures 1-4As shown, the deep geophysical mechanics test system geothermal experiment cabin disclosed in the embodiment comprises a cabin body 1 of a hexahedral structure and six docking pressure heads 2, and the cabin body 1 has an internal space for accommodating a pressure box. The six docking pressure heads 2 are respectively located in the X-axis, Y-axis and Z-axis directions and are respectively located in six directions of the cabin body 1.

[0054] It is worth noting that the three axes herein refer to the X-axis, Y-axis and Z-axis in the three-axis coordinate system. The six docking pressure heads 2 are respectively two docking pressure heads 2 symmetrically arranged in the X-axis direction, two docking pressure heads 2 symmetrically arranged in the Y-axis direction and two docking pressure heads 2 symmetrically arranged in the Z-axis direction.

[0055] The six docking pressure heads 2 are respectively arranged in through holes in the six faces of the cabin body 1, and the docking pressure heads 2 are axially movable relative to the cabin body 1.

[0056] In a possible design, the inner end of the docking pressure head 2 is a cylindrical pressure rod 21, and the outer end is a spherical head 22 for docking with the actuator pressure head.

[0057] In a possible design, as shown in the drawings, Figures 1-5 The cabin body 1 is integrally mounted by a high-rigidity outer cubic frame 11, which is integrally manufactured to ensure the stability of the overall system; the six directions of the cabin body 1 are respectively screw-connected with heating panels 12 and the outer cubic frame 11, and the six docking pressure heads 2 are respectively arranged in the center of one of the heating panels 12.

[0058] The six-direction heating panels 12 are respectively embedded with electric heating elements 31, and the heating panels 12 are respectively provided with electrode covers 32 matched with the electric heating elements 31. In particular, the electric heating elements 31 are resistance heating wires.

[0059] In a possible design, the structure of the heating panel 12 has the following two kinds:

[0060] The first kind, as shown in the drawings, Figure 1 , Figure 4 , Figure 6 , Figure 7 The plate body of the heating panel 12 is integrally manufactured, the outer side of the heating panel 12 is provided with an elastic plate 13, the two ends of the elastic plate 13 are movably connected with the outer cubic frame 11, the elastic plate 13 and the heating panel 12 are coaxially provided with through holes, the docking pressure head 2 is arranged in the through hole, and the docking pressure head 2 is fixedly connected with the elastic plate 13 by screws. The outer surface of the heating panel 12 is provided with a matched plate groove 120 corresponding to the position of the elastic plate 13, so that there is a gap between the elastic plate 13 and the outer surface of the heating panel 12 under normal circumstances.

[0061] Optionally, the electric heating elements 31 on the heating panel 12 are arranged in a ring shape, and the heating panel 12 is externally provided with a matched electrode cover 32.

[0062] The second type, such as Figure 1 , Figure 4 , Figure 9 , Figure 10 , Figure 11 As shown, the heating panel 12 is divided into three independently manufactured parts: a first plate 121, a second plate 122, and a third plate 123. These three plates are assembled sequentially to form the heating panel 12. The second plate 122 is located between the first plate 121 and the third plate 123. A mating head 2 is mounted on the second plate 122. The first plate 121 and the third plate 123 are fixed to the outer cubic frame 11 by screws. Electric heating elements 31 are mounted on the first plate 121 and the third plate 123. Electrode covers 32, adapted to the electric heating elements 31, are respectively mounted on the outside of the first plate 121 and the third plate 123. Optionally, the electric heating elements 31 on the first plate 121 and the third plate 123 are arranged in a rectangular, serpentine pattern.

[0063] The outer side of the second plate 122 has an elastic plate 13. Both ends of the elastic plate 13 are movably connected to the outer cubic frame 11. The elastic plate 13 and the second plate 122 have coaxial through holes. The mating head 2 is installed in the through holes and is fixed to the elastic plate 13 and the second plate 122 by screws. In particular, the outer surface of the second plate 122 is lower than that of the first plate 121 and the second plate 122 to form a plate groove 120 that is adapted to the elastic plate 13. The elastic plate 13 is installed in the plate groove 120.

[0064] In one possible design, the second plate 122 is slidably engaged with the first plate 121 and the third plate 123. The first plate 121 and the third plate 123 have limiting steps 124 to prevent the second plate 122 from sliding outwards. The second plate 122 has steps on both sides that match the limiting steps 124. Under external force, the second plate 122 can move inwards relative to the first plate 121 and the third plate 123 to transmit pressure; after the external force disappears, the elastic plate 13 drives the second plate 122 to reset. Optionally, the cross-section of the second plate 122 is T-shaped.

[0065] Optional, such as Figure 8 As shown, the elastic plate 13 has strip-shaped notches 131 at both ends. The outer cubic frame 11 is fitted with matching screws at the positions corresponding to the strip-shaped notches 131. The two ends of the elastic plate 13 are respectively secured to the screws through the strip-shaped notches 131.

[0066] It is worth noting that the heating panel should ideally be made of heat-insulating material.

[0067] It is worth noting that all six heating panels 12 of the cabin 1 may adopt the heating panel 12 of the first structure described above, or all of them may adopt the heating panel 12 of the second structure; or some may adopt the heating panel 12 of the first structure and some of them may adopt the heating panel 12 of the second structure.

[0068] In one possible design, the heating panels 12 in the Y and Z directions adopt the second structure described above, that is, each heating panel 12 in the Y and Z directions has two sets of electric heating elements 31 arranged on it, and each heating panel 12 in the Y and Z directions has two electrode covers 32 connected to its exterior. The X direction adopts the first structure described above, that is, the heating panel 12 in the X direction has one set of annular electric heating elements 31 arranged on it, and each of the two heating panels 12 in the X direction has one electrode cover 32 connected to its exterior.

[0069] During use, the chamber ambient temperature can be set according to experimental requirements. In one possible design, the temperature can range from room temperature +10℃ to 600℃, with a temperature uniformity of 5℃.

[0070] In one possible design, the top of the hull 1 is equipped with two hoisting components that can be connected to corresponding parts of the vertical hydraulic system frame of the loading system.

[0071] In one possible design, such as Figure 12 , Figure 13 As shown, the geothermal experimental chamber of the deep geophysical and mechanical testing system also includes a highly elastic pressure box 4.

[0072] like Figures 14-16 As shown, the high-elasticity pressure box 4 includes elastic sheets 42 and six pressure heads 41. The six pressure heads 41 are connected together by at least eight elastic sheets 42 to form a sample space for placing the sample 10. The six pressure heads 41 are respectively used to dock with six docking pressure heads 2.

[0073] The high-elasticity pressure box 4 is operably placed inside the cavity of the chamber 1. The inner ends of the six-directional mating pressure heads 2 of the chamber 1 are respectively mated with the outer ends of the six-directional pressure heads 41 of the high-elasticity pressure box 4. The cubic sample 10 is operably placed inside the high-elasticity pressure box 4, and the six-directional pressure heads 41 of the high-elasticity pressure box 4 are respectively in contact with the six surfaces of the sample 10.

[0074] Optionally, the pressure head 41 has a mating interface 411 in the center that is adapted to the mating pressure head 2.

[0075] The number of elastic plates 42 is set reasonably according to needs. In one possible design, for example, 12 elastic plates 42 are used to connect 6 indenters 41 together. Each indenter 41 is connected to the four surrounding indenters 41 by an elastic plate 42. The 12 elastic plates 42 allow the 6 indenters 41 to be assembled together, thus achieving a tight fixation and fit between the indenter and the cubic sample.

[0076] In another embodiment, the six pressure heads 41 can be connected together using more elastic sheets 42.

[0077] Optionally, the outer end of the pressure head 41 is provided with a spring plate groove that matches the elastic plate 42. The spring plate groove has a screw hole, and one end of the elastic plate 42 is placed in the spring plate groove and connected to the pressure head 41 by a screw. Optionally, the elastic plate 42 is a highly elastic metal sheet.

[0078] In one possible design, the indenter 41 is rectangular, and the sample space can accommodate a cubic sample. During the experiment, the indenter 41 contacts the sample surface, allowing pressure to be evenly transferred to the sample. It is worth noting that the dimensions of the indenter 41 can be appropriately set as needed. Optionally, a cube with a side length of 100 mm can be placed in the sample space.

[0079] In one possible design, a heat-conducting pad 410 is installed in a hole at the front end of the pressure head 41.

[0080] In one possible design, each pressure head 41 is equipped with a high-temperature and high-pressure resistant temperature sensor and / or heat flow sensor at the middle position of its front end, which can realize real-time monitoring of the sample surface temperature and measurement of heat flow during the experiment.

[0081] Specifically, each pressure head 41 has a temperature and heat flow integrated probe embedded in its central hole. A thermal pad 410 is installed at the front end of the central hole of the pressure head 41, through which the sample temperature is transferred to the temperature and heat flow integrated probe inside the central hole.

[0082] In one possible design, such as Figure 14 As shown, at least one displacement detection mechanism 5 is provided between the two pressure heads 41 in the X-axis direction, at least one displacement detection mechanism 5 is provided between the two pressure heads 41 in the Y-axis direction, and at least one displacement detection mechanism 5 is provided between the two pressure heads 41 in the Z-axis direction, so that sample deformation monitoring can be performed in the X, Y, and Z directions.

[0083] In one possible design, such as Figure 17 , Figure 18As shown, the displacement detection mechanism 5 includes a first connecting seat 51, a second connecting seat 52, a first lead-out straight rod 53, a second lead-out straight rod 54, a sensor mounting block 55, and a displacement sensor 56. The first lead-out straight rod 53 and the second lead-out straight rod 54 are parallel. One end of the first lead-out straight rod 53 is fixedly connected to the first connecting seat 51, and one end of the second lead-out straight rod 54 is fixedly connected to the second connecting seat 52. The other end of the first lead-out straight rod 53 is connected to the sensor mounting block 55. The displacement sensor 56 is mounted on the sensor mounting block 55. The other end of the second lead-out straight rod 54 is adapted to the detection end of the displacement sensor 56. The two can be connected or not connected. The first connecting seat 51 and the second connecting seat 52 are respectively mounted on two pressure heads 41 on the same shaft by screws. When the sample 10 deforms, the two pressure heads 41 on the same axis undergo relative displacement, which causes the first lead-out straight rod 53 and the second lead-out straight rod 54 to undergo relative displacement, which in turn causes the sensor mounting block 55 and the second lead-out straight rod 54 to undergo relative displacement. The displacement sensor 56 that is adapted to it can detect the amount of displacement and realize deformation monitoring.

[0084] If the displacement sensor 56 is a contact sensor, then the displacement sensor 56 is connected to or in contact with the other end of the second lead-out straight rod 54; if the displacement sensor 56 is a non-contact sensor, then the displacement sensor 56 and the other end of the second lead-out straight rod 54 are directly opposite each other, either in contact or not in contact. The first connecting seat 51 and the second connecting seat 52 are mounted on the side of the pressure head 41. In particular, to facilitate the passage of the first lead-out straight rod 53 and the second lead-out straight rod 54, the pressure head 41 at the corresponding position has a lead-out straight rod through hole 13. Taking the first lead-out straight rod 53 and the second lead-out straight rod 54 connected to the pressure head 41 in the X-axis direction as an example, the first lead-out straight rod 53 and the second lead-out straight rod 54 are parallel to the X-axis direction, and the first lead-out straight rod 53 and the second lead-out straight rod 54 in the X-axis direction pass through the lead-out straight rod through hole 13 of the pressure head 41 in the Y-axis direction.

[0085] In one possible design, displacement sensor 56 is an LVDT sensor.

[0086] The first lead-out straight rod 53 can not only install and fix the displacement sensor 56, but also lead the displacement sensor 56 to the outside of the cabin 1. This not only enables the monitoring of displacement in high-temperature environments, but also avoids the high-temperature environment inside the cabin 1 from affecting the displacement sensor 56.

[0087] Optionally, two displacement sensors 56 are installed between the two indenters 41 in the X-axis direction, positioned diagonally opposite each other. This allows for precise measurement of sample deformation in the X-axis direction, with a maximum deformation of ±5 mm and an accuracy of ±0.5%FS. Similarly, two displacement sensors 56 are installed between the two indenters 41 in the Y-axis direction, positioned diagonally opposite each other. This also allows for precise measurement of sample deformation in the Y-axis direction, with a maximum deformation of ±5 mm and an accuracy of ±0.5%FS. Three displacement sensors 56 are installed between the two indenters 41 in the Z-axis direction, positioned at the three corners of each indenter. This allows for precise measurement of sample deformation in the Z-axis direction, with a maximum deformation of ±5 mm and an accuracy of ±0.5%FS. By installing two displacement sensors 56 each in the X and Y directions and three displacement sensors 56 in the Z-axis direction, sample deformation monitoring can be performed in all three directions (X, Y, and Z), with a deformation range of -5 to +5 mm and an error of less than 1%.

[0088] In one possible design, such as Figure 19 As shown, a heating plate 6 is installed at the front end of at least one pressure head 41, and an electric heating element 31 is installed inside the heating plate 6.

[0089] In one possible design, the front end of the heating plate 6 is equipped with a high-temperature and high-pressure resistant temperature sensor and / or heat flow sensor, which can monitor the temperature of the sample surface in real time.

[0090] In one possible design, the heating plate 6 has a through hole in the center, a heat-conducting pad 410 is installed at the front end of the through hole, and a temperature and heat flow integrated probe is installed at the rear end of the through hole. The sample temperature is transferred to the temperature and heat flow integrated probe inside the central hole through the heat-conducting pad 410.

[0091] Specifically, the heating plate 6 is rectangular and adapted to the indenter 41. The heating plate 6 is in contact with the sample surface, allowing heat to be evenly transferred to the sample 10.

[0092] In one possible design, a heating plate 6 is installed only at the front end of the indenter 41 above the Z-axis. This allows for uniform heating of the upper part of the sample 10 according to experimental requirements, with a temperature range of room temperature +10℃ to 600℃ and a temperature uniformity of 5℃. It is worth noting that the thickness of the indenter 41 with the heating plate 6 at the front end is less than that of the other indenters 41, making its total thickness after installing the heating plate 6 comparable to the thickness of the other indenters 41. The front end of the indenter 41 without the heating plate 6 is also equipped with a high-temperature and high-pressure resistant temperature sensor and / or heat flow sensor, which can monitor the sample surface temperature in real time. Specifically, the front end of the central hole of the indenter 41 without the heating plate 6 is equipped with a thermally conductive pad 410, and the rear end of the through hole is equipped with an integrated temperature and heat flow probe. The sample temperature is transferred to the integrated temperature and heat flow probe inside the central hole through the thermally conductive pad 410.

[0093] In one possible design, each of the six pressure heads 41 is equipped with a heating plate 6 at its front end. This ensures that the heating plate 6 is in contact with the sample 10 in all six directions, achieving efficient and uniform transmission of pressure and temperature.

[0094] In one possible design, the electric heating element 31 is a resistance heating wire. Specifically, such as... Figure 20 , Figure 21 As shown, there is a serpentine groove 61 on the back of the heating plate 6 for mounting a resistance heating wire. The resistance heating wire is fixed in the serpentine groove 61 by multiple spaced ceramic rings 62, and the pressure head 41 is fastened to the back of the heating plate 6. The resistance heating wire passes through the ceramic rings 62 in sequence, and the ceramic rings 62 are locked in the serpentine groove 61, which can avoid direct contact between the resistance heating wire and the heating plate 6 and prevent local overheating.

[0095] In one possible design, the pressure head 41 is made entirely of a high-rigidity alloy material, possessing sufficient rigidity to meet 12 GN / m. The heating plate 6 is also made of a high-rigidity alloy material, and it contacts the pressure head 41; its surface can be provided with alignment slots.

[0096] In use, the geothermal experimental chamber of the deep geophysical mechanics testing system is placed within the loading frame of the triaxial six-axis stress loading system. Each of the six directions of the loading frame is equipped with a hydraulic actuator. The output ends of the six hydraulic actuators have ball-and-socket pressure heads adapted to ball heads 22. The six hydraulic actuators are respectively connected to the outer ends of the six docking pressure heads 2. The inner ends of the six docking pressure heads 2 are respectively connected to the outer ends of the six pressure heads 41. The inner ends of the six pressure heads are respectively in contact with the six surfaces of the sample 10, thereby uniformly transmitting the force to the sample 10.

[0097] One method of using this application is to heat the entire cavity through the heating panel 12 of the chamber 1, and then heat the sample through the heating plate 6 on the pressure head 41 to achieve a temperature difference between the two sides, and then use this temperature difference to measure the thermal conductivity.

[0098] This application can provide a high-temperature environment for the sample and can detect, provide feedback on, and adjust the temperature of the sample under test in real time.

[0099] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A geothermal experimental chamber for a deep geophysical and mechanical testing system, characterized in that: include: The cabin (1) has a hexahedral structure and includes heating panels (12) in 6 directions. The heating panels (12) are equipped with electric heating elements (31). Six docking heads (2) are installed in the through holes of one of the heating panels (12) and can move axially relative to the cabin (1). The six docking heads (2) are located in pairs in the X-axis, Y-axis and Z-axis directions. The cabin (1) also includes an integrally manufactured outer cubic frame (11), and six heating panels (12) are respectively installed in six directions of the outer cubic frame (11); Each heating panel (12) has an elastic plate (13) on its outer side. The two ends of the elastic plate (13) are movably connected to the outer cubic frame (11). The elastic plate (13) and the heating panel (12) have coaxial through holes. The mating head (2) is installed in the through holes of the elastic plate (13) and the heating panel (12). The mating head (2) is fixedly connected to the elastic plate (13). The heating panel (12) is divided into three independently manufactured parts: a first plate (121), a second plate (122), and a third plate (123). The first plate (121), the second plate (122), and the third plate (123) are assembled together in sequence to form the heating panel (12). The second plate (122) is located between the first plate (121) and the third plate (123). The first plate (121) and the third plate (123) are fixedly connected to the outer cubic frame (11). The electric heating element (31) is mounted on the first plate (121) and the third plate (123). The second plate (122) is adapted to the elastic plate (13), the elastic plate (13) is located outside the second plate (122), the elastic plate (13) and the second plate (122) have coaxial through holes, the mating head (2) is installed in the through holes of the elastic plate (13) and the second plate (122), and the mating head (2) is fixedly connected to the elastic plate (13) and the second plate (122); The outer surface of the second plate (122) is lower than that of the first plate (121). The second plate (122) forms a groove (120) that is adapted to the elastic plate (13). The elastic plate (13) is installed in the groove (120). The second plate (122) is in sliding fit with the first plate (121) and the third plate (123). The first plate (121) and the third plate (123) have limiting steps (124) to prevent the second plate (122) from sliding outward. The second plate (122) has steps on both sides that are adapted to the limiting steps (124).

2. The geothermal experimental chamber of the deep geophysical and mechanical testing system according to claim 1, characterized in that: The elastic plate (13) has strip-shaped notches (131) at both ends. The outer cubic frame (11) is fitted with matching screws at the positions corresponding to the strip-shaped notches (131). The two ends of the elastic plate (13) are respectively secured to the screws through the strip-shaped notches (131).

3. The geothermal experimental chamber of the deep geophysical and mechanical testing system according to claim 1, characterized in that: It also includes a highly elastic pressure box (4), which is operably placed inside the cabin (1); The high-elasticity pressure box (4) includes elastic sheets (42) and 6 pressure heads (41). The 6 pressure heads (41) are connected together by at least 8 elastic sheets (42) to form a sample space for placing the sample. The 6 pressure heads (41) are respectively connected to one of the docking pressure heads (2). The pressure head (41) is equipped with a temperature sensor and / or a heat flow sensor.

4. The geothermal experimental chamber of the deep geophysical and mechanical testing system according to claim 3, characterized in that: The pressure head (41) is rectangular. For example, 6 pressure heads (41) are connected together by 12 elastic plates (42). Each pressure head (41) is connected to the 4 pressure heads (41) around its perimeter by an elastic plate (42).

5. The geothermal experimental chamber of the deep geophysical and mechanical testing system according to claim 3, characterized in that: At least one displacement detection mechanism (5) is provided between the two pressure heads (41) in the X-axis direction; At least one displacement detection mechanism (5) is provided between the two pressure heads (41) in the Y-axis direction; At least one displacement detection mechanism (5) is provided between the two pressure heads (41) in the Z-axis direction.

6. The geothermal experimental chamber of the deep geophysical and mechanical testing system according to claim 5, characterized in that: The displacement detection mechanism (5) includes a first connecting seat (51), a second connecting seat (52), a first lead-out straight rod (53), a second lead-out straight rod (54), a sensor mounting block (55), and a displacement sensor (56). The first connecting seat (51) and the second connecting seat (52) are connected by two pressure heads (41) mounted on the same shaft. The first lead-out straight rod (53) and the second lead-out straight rod (54) are parallel. One end of the first lead-out straight rod (53) is fixed to the first connecting seat (51), and one end of the second lead-out straight rod (54) is fixed to the second connecting seat (52). The other end of the first lead-out straight rod (53) is connected to the sensor mounting block (55). The displacement sensor (56) is mounted on the sensor mounting block (55). The detection end of the displacement sensor (56) is adapted to the other end of the second lead-out straight rod (54). The two are connected or not connected. The displacement sensor (56) is led out to the outside of the cabin (1) through the first lead-out straight rod (53).

7. The geothermal experimental chamber of the deep geophysical and mechanical testing system according to claim 5, characterized in that: At least one pressure head (41) has a heating plate (6) installed at its front end, and the heating plate (6) contains an electric heating element (31).

8. The geothermal experimental chamber of the deep geophysical and mechanical testing system according to claim 7, characterized in that: Each pressure head (41) is equipped with a heating plate (6) at its front end.

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