Deformation measuring device and high-temperature full-rigid true triaxial loading equipment

Abstract

The invention discloses a deformation measuring device and high-temperature full-rigid true triaxial loading equipment, relates to the technical field of high-temperature rock testing, and mainly aims to prevent the deformation measuring device of the high-temperature full-rigid true triaxial loading equipment from being influenced by high temperature in a high-temperature rock mechanics experiment process. Therefore, the accurate measurement of the deformation measurement assembly on the rock deformation is ensured. According to the main technical scheme, the deformation measuring device is applied to the high-temperature full-rigid true triaxial loading equipment and comprises a first shell, a second shell, a third shell and a fourth shell, the second shell is arranged in the first shell, and the second shell is a heat preservation and insulation shell; a deformation measurement assembly, wherein the deformation measurement assembly is arranged in the second shell; and the cooling assembly is arranged in the second shell body.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature rock testing, and in particular to a deformation measuring device and a high-temperature fully rigid true triaxial loading device. Background Art

[0002] In deep engineering fields such as deep mineral development, geological disposal of nuclear waste, geothermal energy extraction, and deep tunnel excavation, the study of the mechanical behavior of rocks under high temperature and high pressure conditions is crucial. Testing the mechanical properties of rocks under high temperature and high pressure conditions is becoming increasingly important, especially the deformation characteristics of rocks under high temperature conditions, which are particularly important for analyzing the mechanical properties of rocks.

[0003] Fully rigid true triaxial loading test equipment can usually realistically simulate the environmental conditions of deep rock masses in extreme environments through deformation measurement devices. However, traditional deformation measurement devices are easily affected by high temperatures during full rigid true triaxial high-temperature rock mechanics experiments adapted to high-temperature environments, resulting in decreased sensitivity or even failure. Summary of the Invention

[0004] In view of this, an embodiment of the present invention provides a deformation measurement device and a high-temperature fully rigid true triaxial loading device. The main purpose is to prevent the deformation measurement device of the high-temperature fully rigid true triaxial loading device from being affected by high temperature during high-temperature rock mechanics experiments, thereby ensuring that the deformation measurement component accurately measures the rock deformation.

[0005] To achieve the above objectives, the present invention mainly provides the following technical solutions:

[0006] In one aspect, an embodiment of the present invention provides a deformation measuring device, comprising:

[0007] a first shell, wherein the first shell is an impact-resistant shell;

[0008] A second shell is disposed in the first shell, and the second shell is a thermal insulation shell;

[0009] a deformation measuring assembly, the deformation measuring assembly being disposed in the second housing;

[0010] A cooling component is disposed in the second shell.

[0011] Furthermore, the second shell includes a first heat reflecting layer, a first thermal insulation layer and a second heat reflecting layer arranged in sequence from the outside to the inside, the first heat reflecting layer is laid on the inner surface of the first shell, the second heat reflecting layer is laid on the inner surface of the first thermal insulation layer, and the first thermal insulation layer is arranged between the first heat reflecting layer and the second heat reflecting layer.

[0012] Furthermore, the deformation measuring device further includes:

[0013] Thermal insulation material, the thermal insulation material is filled between the second shell, the deformation measurement component and the cooling component.

[0014] Furthermore, the cooling assembly includes a cooling pipe, and the cooling pipe is used to pass a cooling medium;

[0015] The cooling pipe is spirally wound around the outside of the deformation measuring component and spirally extended along the length direction of the deformation measuring component.

[0016] Furthermore, the end of the cooling pipe passes through the second shell and the first shell in sequence;

[0017] The cooling assembly further includes a first thermal insulation sleeve, which is wrapped around the end of the cooling pipe;

[0018] The first thermal insulation sleeve includes a third heat reflecting layer, a second thermal insulation layer and a fourth heat reflecting layer which are sequentially connected from the inside to the outside.

[0019] Furthermore, a first mounting hole is formed on the first shell, a second mounting hole is formed on the second shell that is opposite to and connected to the first mounting hole, and a second thermal insulation sleeve is provided in at least the second mounting hole of the first mounting hole and the second mounting hole;

[0020] The end of the cooling pipe passes through the second thermal insulation sleeve;

[0021] The inner surface of the second thermal insulation sleeve is provided with a first groove, and the first groove extends spirally along the axial direction of the second thermal insulation sleeve.

[0022] Furthermore, the deformation measurement component includes:

[0023] a third shell;

[0024] The sensor is arranged in the third shell, and the sensor includes a measuring end, which passes through the third shell, the second shell and the first shell in sequence. There are two sensors, and the measuring ends of the two sensors are arranged in opposite directions.

[0025] Furthermore, the sensor includes an elastic member, a sensor body and a measuring rod;

[0026] One end of the elastic member is connected to the third shell;

[0027] The measuring rod is a non-magnetic member, one end of which is connected to the other end of the elastic member, and the other end of which passes through the third housing, the second housing, and the first housing in sequence to form the measuring end. The measuring rod is connected to the iron core of the sensor body and is used to move relative to the sensor body to compress or release the elastic member.

[0028] The measuring rods of the two sensors move in opposite directions and are located on the same straight line.

[0029] Furthermore, a third mounting hole is formed on the first shell, a fourth mounting hole is formed on the second shell and is opposite to and connected to the third mounting hole, and a third thermal insulation sleeve is provided in at least the fourth mounting hole of the third mounting hole and the fourth mounting hole;

[0030] The measuring rod passes through the third thermal insulation sleeve;

[0031] The inner surface of the third thermal insulation sleeve is provided with a second groove, and the second groove extends spirally along the axial direction of the third thermal insulation sleeve;

[0032] The first shell, the second shell and the third shell each include a shell body and a cover body detachably connected to the shell body, and a sealing member is provided between the shell body and the cover body.

[0033] On the other hand, an embodiment of the present invention further provides a high-temperature fully rigid true triaxial loading device, comprising the aforementioned deformation measuring device.

[0034] By means of the above technical solution, the present invention has at least the following beneficial effects:

[0035] In the deformation measuring device provided by an embodiment of the present invention, the deformation measuring component is arranged in a second shell, the second shell is a thermal insulation shell, and a cooling component is also arranged in the second shell, wherein the second shell can isolate the high temperature environment of the external full-rigid true triaxial loading device from the deformation measuring component inside it, and the cooling component can cool and control the internal temperature of the second shell. The thermal insulation shell and the cooling component work together to stabilize the working temperature of the deformation measuring component at a suitable temperature. Therefore, during the high-temperature rock mechanics experiment of the full-rigid true triaxial in a high-temperature environment, the working temperature of the deformation measuring component can be stabilized at a suitable temperature, and the deformation measuring component will not be affected by the high-temperature environment, thereby ensuring the accurate measurement of rock deformation by the deformation measurement component.

[0036] In addition, in the deformation measuring device provided by the embodiment of the present invention, the second shell is arranged in the first shell, and the first shell is an impact-resistant shell. Therefore, the first shell provides a mechanical protection function for the deformation measuring device. During the full-rigid true triaxial high-temperature rock mechanics experiment in a high-temperature environment, the first shell can effectively protect the deformation measuring component from flying rock chips and the impact caused by sudden movement of other experimental devices, which not only better ensures the accurate measurement of rock deformation by the deformation measuring component, but also extends the service life of the deformation measuring component. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic structural diagram of a deformation measurement device provided by an embodiment of the present invention;

[0038] Figure 2 A schematic structural diagram of a deformation measuring device provided by an embodiment of the present invention with its cover removed;

[0039] Figure 3 A schematic cross-sectional view of a deformation measuring device provided by an embodiment of the present invention at a first viewing angle;

[0040] Figure 4 A schematic cross-sectional view of a deformation measuring device provided by an embodiment of the present invention at a second viewing angle;

[0041] Figure 5 An exploded schematic diagram of a deformation measuring device provided in an embodiment of the invention. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings of preferred embodiments of the present invention. Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other unless there is any conflict.

[0043] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a deformation measuring device, which is applied to a high-temperature fully rigid true triaxial loading device. The deformation measuring device includes a first shell 1, which is an impact-resistant shell; a second shell 2, which is arranged in the first shell 1, and the second shell 2 is a thermal insulation shell; a deformation measuring component 3, which is arranged in the second shell 2; and a cooling component 4, which is arranged in the second shell 2.

[0044] The first housing 1 can be made of a material with good impact resistance and high temperature resistance, such as a nickel-based high-temperature alloy (high-temperature resistant Inconel 625 alloy), with a thickness of 5 mm. The second housing 2 can be made of a material with good thermal insulation properties, such as high-temperature resistant mica fiberboard, which has low thermal conductivity and excellent thermal insulation properties.

[0045] In the deformation measurement device provided by an embodiment of the present invention, the deformation measurement component 3 is arranged in the second shell 2, the second shell 2 is a thermal insulation shell, and a cooling component 4 is also arranged in the second shell 2, wherein the second shell 2 can isolate the high temperature environment of the external full-rigid true triaxial loading device from the deformation measurement component 3 inside it, and the cooling component 4 can cool and control the internal temperature of the second shell 2. The thermal insulation shell and the cooling component 4 work together to stabilize the working temperature of the deformation measurement component 3 at a suitable temperature. Therefore, during the high-temperature rock mechanics experiment of the full-rigid true triaxial in a high-temperature environment, the working temperature of the deformation measurement component 3 can be stabilized at a suitable temperature, and the deformation measurement component 3 will not be affected by the high-temperature environment, thereby ensuring the accurate measurement of rock deformation by the deformation measurement component 3.

[0046] In addition, in the deformation measuring device provided by the embodiment of the present invention, the second shell 2 is arranged in the first shell 1, and the first shell 1 is an impact-resistant shell. Therefore, the first shell 1 provides a mechanical protection function for the deformation measuring device. During the full-rigid true triaxial high-temperature rock mechanics experiment in a high-temperature environment, the first shell 1 can effectively protect the deformation measurement component 3 from flying rock chips and the impact caused by sudden movement of other experimental devices, which not only better ensures the accurate measurement of rock deformation by the deformation measurement component 3, but also extends the service life of the deformation measurement component 3.

[0047] In some embodiments, the second shell 2 may include a first heat reflecting layer, a first thermal insulation layer, and a second heat reflecting layer arranged in sequence from the outside to the inside, the first heat reflecting layer is laid on the inner surface of the first shell 1, the second heat reflecting layer is laid on the inner surface of the first thermal insulation layer, and the first thermal insulation layer is arranged between the first heat reflecting layer and the second heat reflecting layer.

[0048] The first and second heat-reflecting layers reflect and absorb heat, reducing heat transfer, while the first thermal insulation layer provides thermal isolation, isolating the high-temperature external environment from the internal environment. Therefore, during the fully rigid true triaxial high-temperature rock mechanics experiment in a high-temperature environment, the high-temperature heat is gradually reduced by the first heat-reflecting layer, the first thermal insulation layer, and the second heat-reflecting layer, thereby improving the thermal isolation of the second housing 2 and ensuring that the operating temperature of the deformation measurement assembly 3 remains stable at an appropriate level.

[0049] Specifically, the first and second heat reflecting layers may be aluminum-plated polyester films, and the first thermal insulation layer may be a nickel-based high-temperature alloy (high-temperature resistant Inconel 625 alloy) material layer.

[0050] In some embodiments, the deformation measuring device may further include a thermal insulation material, which is filled between the second shell 2 , the deformation measuring component 3 and the cooling component 4 .

[0051] Because the thermal conductivity of the insulating material is lower than that of air, the insulating material is placed between the second shell 2, the deformation measurement assembly 3, and the cooling assembly 4. Specifically, the insulating material is placed within the remaining space of the second shell 2, minimizing the number of voids within the second shell 2. This further isolates or weakens heat transferred from the outside world through the insulating material, thereby further improving the thermal insulation effect of the deformation measurement device and, in turn, the accuracy of rock deformation measurement by the deformation measurement assembly 3. Specifically, the insulating material can be SiO2 aerogel, which has a low thermal conductivity and excellent thermal insulation effect.

[0052] In some embodiments, see Figure 3 、 Figure 4 and Figure 5 The cooling assembly 4 may include a cooling pipe 41, which is used to pass a cooling medium to take away the heat not isolated by the second shell 2 and the thermal insulation material, thereby further reliably ensuring the temperature of the working environment of the deformation measurement assembly 3.

[0053] Among them, the cooling component 4 can also include a pump body such as a miniature centrifugal pump and a proportional-integral-differential controller. The pump body is used to drive the circulation of the cooling medium in the cooling pipe 41, and the controller is used to control the power of the pump body to adjust the flow rate of the cooling medium, thereby adjusting the cooling temperature of the cooling component 4, and then dynamically controlling the temperature around the deformation measurement component 3 to better ensure the stability of the working environment temperature of the deformation measurement component 3.

[0054] Specifically, the cooling pipe 41 can be made of a seamless nickel-based high-temperature alloy (high-temperature resistant Inconel 625 alloy) to provide excellent high-temperature resistance, oxidation resistance, stress corrosion cracking resistance, high-purity water corrosion resistance, and alkaline corrosion resistance, while also maintaining excellent stability. The cooling medium can be an ethylene glycol-water mixture.

[0055] In some embodiments, see Figure 3 、 Figure 4 and Figure 5 The cooling pipe 41 can be spirally wrapped around the outside of the deformation measuring component 3 and spirally extended along the length direction of the deformation measuring component 3.

[0056] Among them, the cooling pipe 41 spirally extends along the length direction of the deformation measuring component 3 to the outside of the deformation measuring component 3, and the deformation measuring component 3 can be wrapped inside the cooling pipe 41. Moreover, the cooling pipe 41 is equivalent to being arranged relatively evenly in multiple sections on the outside of the deformation measuring component 3, so that the cooling medium can circulate evenly around its periphery along the length direction of the deformation measuring component 3, thereby realizing that the cooling pipe 41 uniformly and reliably cools the heat around the deformation measuring component 3. In other words, the cooling pipe 41 can provide a temperature-stable working space for the deformation measuring component 3, ensuring the stability of the working environment temperature of the deformation measuring component 3.

[0057] In some embodiments, see Figure 4 and Figure 5 , and combined with Figure 1 The end of the cooling pipe 41 passes through the second shell 2 and the first shell 1 in sequence; the cooling assembly 4 can also include a first thermal insulation sleeve 42, which is wrapped around the end of the cooling pipe 41.

[0058] The ends of the cooling pipe 41 extend through the second shell 2 and the first shell 1, respectively, for connection to external components such as a pump to achieve circulation of the cooling medium. By providing a first thermal insulation sleeve 42, the portion of the cooling pipe 41 extending through the first shell 1 is insulated from the high-temperature environment of the fully rigid true triaxial loading device, preventing high temperatures from damaging the cooling pipe 41 exposed outside the first shell 1.

[0059] In some embodiments, the first thermal insulation sleeve 42 may include a third heat reflecting layer, a second thermal insulation layer, and a fourth heat reflecting layer that are sequentially connected from the inside to the outside.

[0060] The third and fourth heat-reflecting layers reflect and absorb heat, reducing heat transfer, while the second thermal insulation layer provides thermal isolation, isolating the high-temperature external environment from the internal environment. Therefore, during the fully rigid true triaxial high-temperature rock mechanics experiment in a high-temperature environment, the high-temperature heat is gradually reduced by the third heat-reflecting layer, the second thermal insulation layer, and the fourth heat-reflecting layer, thereby enhancing the thermal isolation effect of the first thermal insulation sleeve 42 and further protecting the cooling pipe 41 exposed outside the first shell 1 from high-temperature damage.

[0061] Specifically, the third and fourth heat reflecting layers may be aluminum foil reflecting layers, and the second thermal insulation layer may be a closed-cell rubber-plastic sponge layer.

[0062] In some embodiments, see Figure 1 and Figure 5A first mounting hole 11 is provided on the first shell 1, and a second mounting hole 21 opposite to and connected to the first mounting hole 11 is provided on the second shell 2. A second thermal insulation sleeve is provided in at least the second mounting hole 21 of the first mounting hole 11 and the second mounting hole 21; the end of the cooling pipe 41 passes through the second thermal insulation sleeve.

[0063] To ensure smooth installation between the cooling pipe 41 and the first and second housings 1 and 2, a certain installation gap is typically provided between the first and second mounting holes 11 and 21 and the cooling pipe 41. In the above embodiment, by disposing a second thermal insulation sleeve at least within the second mounting hole 21, that is, at least between the second mounting hole 21 and the cooling pipe 41, the second thermal insulation sleeve can reduce or even isolate heat transferred through the installation gap, thereby further improving the thermal insulation effect of the deformation measurement device.

[0064] In some embodiments, the inner surface of the second thermal insulation sleeve may be provided with a first groove that extends helically along the axial direction of the second thermal insulation sleeve. This first groove can reduce the heat conduction efficiency of the second thermal insulation sleeve, thereby improving the thermal insulation effect of the second thermal insulation sleeve on the installation gap. Specifically, the second thermal insulation sleeve can be made of an Al2O3 ceramic sleeve, and the processing depth of the first groove can be 0.5 mm.

[0065] In some embodiments, see Figure 3 、 Figure 4 and Figure 5 The deformation measurement component 3 may include a third shell 31; a sensor 32 is arranged in the third shell 31, and the sensor 32 includes a measuring end, which passes through the third shell 31, the second shell 2 and the first shell 1 in sequence. There are two sensors 32, and the measuring ends of the two sensors 32 are arranged in opposite directions.

[0066] The measuring ends of the two sensors 32 are arranged in opposite directions, that is, the two sensors 32 are arranged bi-directionally symmetrically. During the loading process of the high-temperature fully rigid true triaxial loading device, the measuring end of one sensor 32 abuts against one loading end of the device, and the measuring end of the other sensor 32 abuts against the other loading end of the device. During the loading process of the two loading ends of the device, the measuring ends of the two sensors 32 simultaneously produce displacement, achieving high-precision measurement while also achieving large-scale measurement of large-scale rock deformation. Compared to using a single sensor 32 to measure large-scale rock deformation, the measuring end of the sensor 32 of the present application is less likely to deform, thereby improving the measurement accuracy of the deformation measurement assembly 3.

[0067] Since there are many components installed in the second shell 2, such as the cooling assembly 4, thermal insulation materials, etc., these components may move or fall off, and once these components have abnormal conditions, they may easily get stuck in the sensor 32, resulting in inaccurate measurement results of the sensor 32, or even causing the sensor 32 to fail.

[0068] In the above embodiment, the sensor 32 is disposed within the third housing 31. The third housing 31 isolates the sensor 32 from other components within the second housing 2, preventing abnormalities in other components from affecting the sensor 32's measurements. Thus, the third housing 31 provides a precise measurement environment for the sensor 32, including a suitable temperature and a reliable and stable measurement space, thereby ensuring the stability and reliability of the sensor 32's measurements. Specifically, the third housing 31 can be made of the same material as the first housing 1.

[0069] In some embodiments, see Figure 3 、 Figure 4 and Figure 5 The sensor 32 may include an elastic member 321, a sensor body 322, and a measuring rod 323. One end of the elastic member 321 is connected to the third housing 31. The measuring rod 323 is a non-magnetic member. One end of the measuring rod 323 is connected to the other end of the elastic member 321. The other end of the measuring rod 323 passes through the third housing 31, the second housing 2, and the first housing 1 in sequence to form the aforementioned measuring end. The measuring rod 323 is connected to the iron core of the sensor body 322. The measuring rod 323 is used to move relative to the sensor body 322 to compress or release the elastic member 321. The measuring rods 323 of the two sensors 32 move in opposite directions and are located on the same straight line. The measuring rod 323 may include a measuring rod body and a pad connected to the measuring rod body. The measuring rod body abuts against the elastic member 321 via the pad. The sensor body 322 can be installed in the third shell 31 through the positioning block. An installation space is set in the positioning block. The contour shape of the positioning block can be adapted to the inner contour shape of the third shell 31, and the contour shape of the installation space can be adapted to the contour shape of the sensor body 322, so as to facilitate the fixation of the sensor body 322 in the positioning block and the fixation of the positioning block in the third shell 31.

[0070] The sensor body 322 can be a linear variable differential transformer (LVDT), a high-precision displacement sensor 32 based on the principle of electromagnetic induction. The measuring rod 323 can be threadedly connected to the core of the sensor body 322. The measuring rod 323 is non-magnetic, meaning it is non-magnetic and does not produce magnetic induction changes, thereby not affecting the reading of the sensor body 322.

[0071] Elastic member 321 can be a constant-force spring with a force range of 5-15N, thus preventing system errors from affecting experimental results. This provides elastic force to measuring rod 323, enabling sensor 32 to repeatedly measure rock deformation during loading and unloading. Furthermore, elastic member 321 can have a pre-compression of 10mm to compensate for thermal expansion at high temperatures, thereby improving the measurement accuracy of sensor 32.

[0072] In addition, the third housing 31 may be provided with a sensor wiring hole for passing the leads of the sensor body 322. A protective sheath, such as a metal bellows, may be placed over the leads, and the sheath may be filled with a thermal insulation material, such as SiO2 aerogel, to provide mechanical and high-temperature protection for the leads, thereby ensuring stable sensor signal transmission.

[0073] During loading, the measuring rod 323 of one sensor 32 abuts one loading end of the device, while the measuring rod 323 of the other sensor 32 abuts the other loading end. During loading at both loading ends, the measuring rods 323 of both sensors 32 drive the iron cores to displace simultaneously, allowing both sensors 32 to measure rock deformation simultaneously. Furthermore, the sensor bodies 322 directly contact the measured object through the measuring rods 323 for direct measurement, eliminating indirect measurement errors.

[0074] In some embodiments, the mounting hole on the third shell 31 for passing the measuring rod 323 can be set to a double-conical hole structure, and the taper can be set to 1:5, so as to facilitate the movement and assembly of the measuring rod 323.

[0075] In some embodiments, see Figure 1 and Figure 5 A third mounting hole 12 is formed on the first shell 1, and a fourth mounting hole 22 is formed on the second shell 2, which is opposite to and connected to the third mounting hole 12. A third thermal insulation sleeve is provided in at least the fourth mounting hole 22 of the third mounting hole 12 and the fourth mounting hole 22; the measuring rod 323 passes through the third thermal insulation sleeve;

[0076] To ensure smooth movement of the measuring rod 323, a certain installation gap is required between the third mounting hole 12, the fourth mounting hole 22, and the measuring rod 323. In the above embodiment, by disposing the third thermal insulation sleeve at least within the fourth mounting hole 22, that is, at least between the fourth mounting hole 22 and the measuring rod 323, the third thermal insulation sleeve can reduce or even isolate heat transferred through the installation gap, thereby further improving the thermal insulation effect of the deformation measurement device.

[0077] In some embodiments, the inner surface of the third thermal insulation sleeve may be provided with a second groove that extends helically along the axial direction of the third thermal insulation sleeve. This second groove can reduce the heat conduction efficiency of the third thermal insulation sleeve, thereby improving the thermal insulation effect of the third thermal insulation sleeve on the installation gap. Specifically, the third thermal insulation sleeve can be made of an Al2O3 ceramic sleeve, and the processing depth of the second groove can be 0.5 mm.

[0078] To facilitate inspection and maintenance of the deformation measuring device, in some embodiments, the first housing 1, the second housing 2, and the third housing 31 may each include a housing body and a cover detachably connected to the housing body, such as by bolts or a mortise and tenon joint. Furthermore, to ensure the sealing and thus thermal insulation of each housing, a seal may be provided between the housing body and the cover. This seal may include a high-temperature resistant sealant layer and / or a high-temperature resistant sealing ring.

[0079] Furthermore, to facilitate mounting and securing the deformation measuring device to the equipment, a fixed support can be provided on the first housing 1, and the deformation measuring device can be mounted on the equipment via the fixed support. Furthermore, a wear-resistant layer can be provided on the surface of the fixed support, such as a spray-coated Al2O3 ceramic coating of a certain thickness, to enhance the wear resistance of the fixed support.

[0080] An embodiment of the present invention further provides a high-temperature fully rigid true triaxial loading device, comprising the aforementioned deformation measuring device.

[0081] The high-temperature fully rigid true triaxial loading device provided by the embodiment of the present invention includes a deformation measuring device. Therefore, the high-temperature fully rigid true triaxial loading device has all the beneficial effects of the deformation measuring device, which will not be described in detail here.

[0082] The deformation measuring device needs to be calibrated before use:

[0083] Temperature stability check: Place the assembled deformation measurement device in a high-temperature chamber and heat it to 600°C at a rate of 5°C / min. Stabilize for 4 hours. Use a K-type thermocouple (accuracy ±1°C) to measure the temperature inside the third housing 31 and ensure it remains below 80°C. Use a PID controller to adjust the flow rate of the cooling medium in the cooling assembly 4 (range 0.5-2 L / min). Record the temperature fluctuation curve inside the third housing 31 and ensure that the temperature fluctuation is ≤ ±2°C.

[0084] Measurement Accuracy Verification: Use a high-precision translation stage (resolution 0.1 μm) to drive a standard steel rod, transmitting displacement through measuring rod 323 of sensor 32. Within the 0-5 mm range, verify every 0.5 mm, recording the output of sensor 322. The calculated linearity error should be ≤ 0.1% FS, and the repeatability error should be ≤ 0.05% FS. The same displacement value should be measured under both forward and reverse loading conditions, with a bidirectional deviation of ≤ 0.02 mm.

[0085] The process of using the deformation measuring device:

[0086] Preparation before the experiment: Check the performance of the sensor 32 in advance, manually move the measuring rod 323, and observe whether there is any abnormality in the range of the sensor body 322. Check whether the cooling component 4 can work normally.

[0087] Specimen installation: Place the rock specimen in the center of the loading chamber of a high-temperature, fully rigid true triaxial loading device, and fix the deformation measuring device on the device fixture, ensuring that it is perpendicular to the specimen surface.

[0088] Loading and Monitoring: Displacement control mode was used at a loading rate of 0.01 mm / min. When approaching the estimated failure load, force control mode was switched to 50 N / s. LVDT signals, temperature signals, and loading force values were simultaneously acquired at a 100 Hz frequency using a National Instruments 9239 data acquisition card.

[0089] Abnormal handling: When the temperature inside the third shell 31 exceeds 85°C, the system automatically triggers an alarm and cuts off the heating power supply; when the signal noise suddenly increases, it automatically switches to the backup sensor 32 channel.

[0090] Post-experiment maintenance: System cooling: After the experiment, keep the cooling system running until the temperature inside the third housing 31 drops below 50°C, then turn off the power. Use compressed air to blow away any debris from the surface of the sensor 32 and check whether the ceramic coating is worn. If scratches appear on the end of the measuring rod 323 that contacts the elastic member 321, polish it with diamond paste (grain size W1) to Ra ≤ 0.4μm. After every 50 experiments, recalibrate the temperature stability and measurement accuracy to ensure that the performance indicators meet the requirements.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A deformation measurement device, applied to a high-temperature fully rigid true triaxial loading device, characterized in that: include: a first shell, wherein the first shell is an impact-resistant shell; A second shell is disposed in the first shell, and the second shell is a thermal insulation shell; a deformation measuring assembly, the deformation measuring assembly being disposed in the second housing; A cooling component is disposed in the second shell.

2. The deformation measuring device according to claim 1, characterized in that The second shell includes a first heat reflecting layer, a first thermal insulation layer, and a second heat reflecting layer arranged in sequence from the outside to the inside, the first heat reflecting layer is laid on the inner surface of the first shell, the second heat reflecting layer is laid on the inner surface of the first thermal insulation layer, and the first thermal insulation layer is arranged between the first heat reflecting layer and the second heat reflecting layer.

3. The deformation measuring device according to claim 1, characterized in that Also includes: Thermal insulation material, the thermal insulation material is filled between the second shell, the deformation measurement component and the cooling component.

4. The deformation measuring device according to claim 1, characterized in that The cooling assembly includes a cooling pipe, and the cooling pipe is used to pass a cooling medium; The cooling pipe is spirally wound around the outside of the deformation measuring component and spirally extended along the length direction of the deformation measuring component.

5. The deformation measuring device according to claim 4, characterized in that The ends of the cooling pipe pass through the second shell and the first shell in sequence; The cooling assembly further includes a first thermal insulation sleeve, which is wrapped around the end of the cooling pipe; The first thermal insulation sleeve includes a third heat reflecting layer, a second thermal insulation layer and a fourth heat reflecting layer which are sequentially connected from the inside to the outside.

6. The deformation measuring device according to claim 5, characterized in that: A first mounting hole is formed on the first shell, and a second mounting hole is formed on the second shell that is opposite to and connected to the first mounting hole, wherein at least the second mounting hole of the first mounting hole and the second mounting hole is provided with a second thermal insulation sleeve; The end of the cooling pipe passes through the second thermal insulation sleeve; The inner surface of the second thermal insulation sleeve is provided with a first groove, and the first groove extends spirally along the axial direction of the second thermal insulation sleeve.

7. The deformation measuring device according to claim 1, characterized in that The deformation measurement assembly comprises: a third shell; The sensor is arranged in the third shell, and the sensor includes a measuring end, which passes through the third shell, the second shell and the first shell in sequence. There are two sensors, and the measuring ends of the two sensors are arranged in opposite directions.

8. The deformation measuring device according to claim 7, characterized in that: The sensor includes an elastic member, a sensor body and a measuring rod; One end of the elastic member is connected to the third shell; The measuring rod is a non-magnetic member, one end of which is connected to the other end of the elastic member, and the other end of which passes through the third housing, the second housing, and the first housing in sequence to form the measuring end. The measuring rod is connected to the iron core of the sensor body and is used to move relative to the sensor body to compress or release the elastic member. The measuring rods of the two sensors move in opposite directions and are located on the same straight line.

9. The deformation measuring device according to claim 8, characterized in that A third mounting hole is formed on the first shell, and a fourth mounting hole is formed on the second shell that is opposite to and connected to the third mounting hole, wherein at least the fourth mounting hole of the third mounting hole and the fourth mounting hole is provided with a third thermal insulation sleeve; The measuring rod passes through the third thermal insulation sleeve; The inner surface of the third thermal insulation sleeve is provided with a second groove, and the second groove extends spirally along the axial direction of the third thermal insulation sleeve; The first shell, the second shell and the third shell each include a shell body and a cover body detachably connected to the shell body, and a sealing member is provided between the shell body and the cover body.

10. A high-temperature, fully rigid, true triaxial loading device, characterized in that: The device comprises the deformation measuring device according to any one of claims 1 to 9.

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