Rock material thermal shock damage change monitoring device and experimental method

Abstract

The application discloses a rock material thermal shock damage change monitoring device and experimental method. The device comprises a sample loading platform, which comprises a sliding rail and a fixing frame installed on the sliding rail; an experimental tube, which comprises a first tube section and a second tube section connected in communication, and the sliding rail can drive the fixing frame to shuttle between the first tube section and the second tube section; a heating furnace, which is installed on the first tube section and heats the rock sample; a cooling device, which is installed on the second tube section and cools the rock sample; and a monitoring device, which is connected with the second tube section and monitors the surface damage change condition of the rock sample after thermal shock. The rock sample is driven by the sample loading platform to enter the first tube section and the second tube section of the experimental tube in sequence, wherein the rock sample is heated by the heating furnace in the first tube section and is cooled by the cooling device in the second tube section, so that the rock sample generates thermal shock phenomenon, the surface change condition of the rock sample is recorded by the monitoring device, and the rock thermal shock damage experiment is completed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rock thermal shock experiment, in particular to a rock material thermal shock damage change monitoring device and an experimental method. BACKGROUND

[0002] With the gradual depletion of shallow resources, the development of resources by human beings is continuously extending to the deep part of the earth. Under the combined action of the thermal activities and geological processes in the interior of the earth such as radioactive decay, magmatic activity and plate tectonic movement, the temperature of the rock stratum generally increases with the depth at a geothermal gradient of 30-50℃ / km. In the abnormal areas with high thermal conductivity, the geothermal gradient can be as high as 200℃ / km. In the process of development and utilization of deep resources, the high-temperature rock mass is not always at a relatively stable temperature, and sometimes experiences a sharp change in temperature. The thermal stress generated in the rock by the sharp change in temperature can lead to the initiation and development of thermal cracks, and further affect the physical and mechanical properties of the rock, which is the thermal shock phenomenon.

[0003] The thermal shock phenomenon occurring in the high-temperature rock mass not only provides convenience for the exploitation of deep resources, but also threatens the safety of rock engineering. For example, in the process of deep drilling, the drilling fluid cools the drill bit while also applying thermal shock to the surrounding rock of the well, which increases the thermal cracks in the surrounding rock. On the one hand, this improves the rock breaking effect and makes drilling easier, and on the other hand, it causes damage to the well wall, leading to deterioration of the rock mass and potential safety hazards. Therefore, the study of thermal shock is of great significance in the development of deep resources.

[0004] However, due to the lack of a perfect experimental method that can accurately capture these damage changes and a matching experimental platform, the distribution of internal damage cracks in the process of rock thermal shock is still difficult to be quantitatively characterized by experiment, which hinders people's in-depth understanding of the mechanism of rock thermal shock damage. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a rock material thermal shock damage change monitoring device, which can perform thermal shock experiment on rock material and monitor the change of rock material under thermal shock.

[0006] The present application also proposes an experimental method based on the above-mentioned rock material thermal shock damage change monitoring device.

[0007] The rock material thermal shock damage change monitoring device according to the first aspect of the present application comprises:

[0008] A sample loading platform comprising a sliding rail and a fixing frame mounted on the sliding rail, the fixing frame being used for fixing a rock sample;

[0009] an experimental tube comprising a first tube section and a second tube section in communication, the slide rail being capable of driving the fixing frame to shuttle between the first tube section and the second tube section;

[0010] a heating furnace mounted on the first tube section and heating the internal space of the first tube section;

[0011] a cooling device mounted on the second tube section and cooling the internal space of the second tube section;

[0012] a monitoring device connected with the second tube section;

[0013] The sample loading platform drives the rock sample to enter the first tube section and the second tube section in sequence, the rock sample is heated and rapidly cooled to cause thermal shock, and the monitoring device monitors the surface damage change of the rock sample after thermal shock in the second tube section.

[0014] The rock material thermal shock damage change monitoring device according to the embodiment of the present application has at least the following beneficial effects: the rock sample is driven by the sample loading platform to enter the first tube section and the second tube section of the experimental tube in sequence, the rock sample is heated by the heating furnace in the first tube section and is cooled by the cooling device in the second tube section, the rock sample is caused to produce thermal shock phenomenon under the condition of heating and cooling, the surface change of the rock sample under thermal shock is recorded by the monitoring device, and the rock thermal shock damage experiment is completed.

[0015] According to some embodiments of the present application, the rock material thermal shock damage change monitoring device further comprises a valve mounted in the experimental tube and arranged between the first tube section and the second tube section, the valve being capable of cutting off the communication between the first tube section and the second tube section when closed and allowing the fixing frame carrying the rock sample to pass through when opened.

[0016] According to some embodiments of the present application, the sample loading platform further comprises an extension rod and a sealing flange, both ends of the extension rod being connected to the slide rail and the fixing frame respectively, and the sealing flange being mounted on the end of the first tube section of the experimental tube and being provided with a through hole for the extension rod to pass through.

[0017] According to some embodiments of the present application, the sample loading platform further comprises a pressure relief valve mounted on the sealing flange to discharge the high-temperature gas in the first tube section.

[0018] According to some embodiments of the present application, the sample loading platform further comprises a thermocouple mounted on the extension rod and in contact with the rock sample through the fixing frame for detecting the heating temperature of the rock sample.

[0019] According to some embodiments of the present application, the sample loading platform further comprises a first baffle fixedly mounted on the fixing frame near one end of the first pipe section and a second baffle hingedly mounted on the fixing frame near one end of the second pipe section, the second baffle being able to be laid down when the fixing frame enters the second pipe section.

[0020] According to some embodiments of the present application, the cooling device comprises a cooling gas tank and a blower, the air inlet of the blower being connected to the cooling gas tank and the air outlet of the blower being connected to the second pipe section of the experimental pipe.

[0021] According to some embodiments of the present application, the monitoring device comprises a fixing seat fixedly connected to the second pipe section, a waveguide rod slidably connected to the fixing seat and having one end capable of extending into the second pipe section and being in contact with the rock sample, a monitoring probe connected to the waveguide rod to form acoustic conduction with the rock sample through the waveguide rod, and an extension power member driving the waveguide rod to slide.

[0022] According to some embodiments of the present application, the monitoring device further comprises a camera and an image acquisition system, the second pipe section being provided with an observation window, the camera being capable of shooting the surface change of the rock sample through the observation window, and the image acquisition system being electrically connected to the camera to acquire images and identify and analyze the images.

[0023] The experimental method according to the second aspect of the present application is performed based on the rock material thermal shock damage change monitoring device described above and comprises the following steps:

[0024] Fixing the rock sample on the fixing frame;

[0025] Starting the sample loading platform and pushing the fixing frame carrying the rock sample into the first pipe section of the experimental pipe by using the slide rail;

[0026] Turning on the heating furnace to heat the rock sample in the first pipe section;

[0027] After heating, pushing the fixing frame carrying the rock sample into the second pipe section of the experimental pipe by using the slide rail;

[0028] Turning on the cooling device to cool the rock sample in the second pipe section, and the rock sample is subjected to thermal shock;

[0029] The monitoring device records the surface change of the rock sample and collects experimental data.

[0030] According to the experimental method of the embodiment of the present application, at least the following beneficial effects are achieved: the rock sample is rapidly sent to the second pipe section for cooling after being heated by the rock material thermal shock damage change monitoring device, heat loss in the transfer process is reduced, the thermal shock effect is more obvious, and the surface damage of the rock sample is more easily monitored.

[0031] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0032] The present application will be further described below in conjunction with the drawings and examples, wherein:

[0033] Figure 1 It is a three-dimensional view of the rock material thermal shock damage change monitoring device of the embodiment of the present application;

[0034] Figure 2 It is a three-dimensional view of the sample loading platform 100 in the rock material thermal shock damage change monitoring device of the embodiment of the present application;

[0035] Figure 3 It is a front view of the sample loading platform 100 in the rock material thermal shock damage change monitoring device of the embodiment of the present application;

[0036] Figure 4 It is a sectional view of the monitoring device 500 in the rock material thermal shock damage change monitoring device of the embodiment of the present application;

[0037] Figure 5 It is a side view of the monitoring device 500 in the rock material thermal shock damage change monitoring device of the embodiment of the present application;

[0038] Figure 6 It is a sectional view of the valve 600 in the rock material thermal shock damage change monitoring device of the embodiment of the present application;

[0039] Figure 7 It is a schematic diagram of the circuit connection of the rock material thermal shock damage change monitoring device of the embodiment of the present application.

[0040] 100-sample loading platform, 110-slideway, 111-motor, 112-screw rod, 113-screw rod seat, 120-fixing frame, 130- extension rod, 140-sealing flange, 150-pressure relief valve, 160-thermocouple, 170-first baffle, 180-second baffle, 200-experimental tube, 210-first tube segment, 220-second tube segment, 300-heating furnace, 400-cooling device, 410-cooling gas tank, 420-blower, 430-gas recovery device, 500-monitoring device, 510-fixing seat, 520-wave guide rod, 530-monitoring probe, 540-telescopic power component, 550-video camera, 560-image acquisition system, 570-data acquisition instrument, 600-valve, 610-valve body, 620-ball, 630-valve rod, 640-electric actuator, 700-rock sample. DETAILED DESCRIPTION

[0041] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application.

[0042] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or component must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0043] In the description of the present application, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. is understood as not including the number, above, below, etc. is understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0044] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0045] In the description of the application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples.

[0046] The thermal shock phenomenon occurring in high-temperature rock mass provides convenience for the exploitation of deep resources, but also threatens the safety of rock engineering. For example, in the process of deep drilling, the drilling fluid cools the drill bit while also applying thermal shock to the surrounding rock, increasing the number of thermal cracks in the surrounding rock, which on the one hand improves the rock breaking effect and makes drilling easier, and on the other hand causes damage to the well wall, leading to rock mass deterioration and safety hazards. Therefore, the study of thermal shock is of great significance in the development of deep resources.

[0047] However, due to the lack of perfect experimental methods and supporting experimental platforms that can accurately capture these damage changes, it is still difficult to quantitatively characterize the distribution of internal damage cracks in rock during thermal shock through experiments, which hinders people's in-depth understanding of the mechanism of rock thermal shock damage.

[0048] To this end, the application provides a rock material thermal shock damage change monitoring device. The rock sample 700 is driven by the sample loading platform 100 to enter the first pipe section 210 and the second pipe section 220 of the experimental pipe 200 in turn. The rock sample 700 is heated by the heating furnace 300 when in the first pipe section 210, and the rock sample 700 is cooled by the cooling device 400 when in the second pipe section 220. The rock sample 700 generates a thermal shock phenomenon under the heating and cooling, and the monitoring device 500 records the surface change of the rock sample 700 under thermal shock, completing the rock thermal shock damage experiment.

[0049] In addition, the application also provides an experimental method based on the above rock material thermal shock damage change monitoring device. The rock sample 700 can be quickly sent to the second pipe section 220 for cooling after being heated, reducing heat loss during the transfer process, so that the thermal shock effect is more obvious, and the surface damage of the rock sample 700 is more easily monitored.

[0050] Reference Figure 1The rock material thermal shock damage change monitoring device of the first aspect embodiment of the present application comprises a sample loading platform 100, an experimental tube 200, a heating furnace 300, a cooling device 400 and a monitoring device 500. The sample loading platform 100 is used to fix the rock sample 700 and drive it to move in the experimental tube 200. The heating furnace 300 is used to heat the rock sample 700, and the cooling device 400 is used to cool the rock sample 700, so that the rock sample 700 will have a thermal shock effect under the temperature change of heating and cooling. The monitoring device 500 is used to detect the rock sample 700 and collect experimental data.

[0051] Specifically, referring to Figure 2 The sample loading platform 100 comprises a sliding rail 110 and a fixing frame 120 mounted on the sliding rail 110. The fixing frame 120 is used to fix the rock sample 700, so that the fixing frame 120 carrying the rock sample 700 can move under the drive of the sliding rail 110.

[0052] The experimental tube 200 comprises a first tube section 210 and a second tube section 220 connected in communication, and the sliding rail 110 can drive the fixing frame 120 to shuttle between the first tube section 210 and the second tube section 220. The heating furnace 300 is mounted on the first tube section 210 and heats the internal space of the first tube section 210, the cooling device 400 is mounted on the second tube section 220 and cools the internal space of the second tube section 220, and the monitoring device 500 is connected with the second tube section 220 and used to detect the rock sample 700 affected by thermal shock in the second tube section 220.

[0053] During the experiment, the sample loading platform 100 drives the rock sample 700 to enter the first tube section 210 and the second tube section 220 in sequence. The rock sample 700 is heated in the first tube section 210 and rapidly cooled in the second tube section 220, so that the thermal shock effect occurs. The monitoring device 500 monitors the surface damage change of the rock sample 700 after being affected by thermal shock in the second tube section 220.

[0054] Specifically, the fixing frame 120 is provided with a plurality of hollow structures to enable the rock sample 700 placed thereon to be fully heated or cooled. A plurality of conical protrusions are further arranged on the fixing frame 120 to adapt to the uneven surface of the rock sample 700 and reduce the rolling of the rock sample 700 on the fixing frame 120.

[0055] As to the specific structure of the sliding rail 110, it can adopt an electric telescopic rod, a pneumatic telescopic rod, a hydraulic telescopic rod or other linear driving components to exert a horizontal force on the fixing frame 120. In the embodiment, referring to Figure 3The slide rail 110 specifically comprises a motor 111, a screw rod 112 and a screw rod base 113. The output shaft of the motor 111 is connected with the screw rod 112, the screw rod base 113 is provided with a threaded hole matched with the screw rod 112, and the fixing frame 120 is connected with the screw rod base 113. Thus, when the output shaft of the motor 111 rotates, the fixing frame 120 can be driven to displace by using the screw rod mechanism.

[0056] Further, the sample loading platform 100 further comprises an extension rod 130 and a sealing flange 140. The extension rod 130 is connected with the slide rail 110 and the fixing frame 120 respectively, and can make the fixing frame 120 deeply enter into the experimental tube 200. The sealing flange 140 is installed at the end of the first tube segment 210 of the experimental tube 200, and is used for sealing the end of the first tube segment 210 to reduce heat loss. The sealing flange 140 is provided with a through hole through which the extension rod 130 passes, so as to reduce the influence on the movement of the extension rod 130.

[0057] Optionally, the sealing flange 140 is connected with the experimental tube 200 in a detachable manner, specifically in a bolt connection manner.

[0058] Further, the sample loading platform 100 further comprises a pressure relief valve 150. The pressure relief valve 150 is installed on the sealing flange 140, and can discharge the gas in the first tube segment 210, so as to timely discharge the high-temperature gas in the first tube segment 210 when the gas pressure in the first tube segment 210 is too high.

[0059] Further, the sample loading platform 100 further comprises a thermocouple 160. The thermocouple 160 is installed on the extension rod 130 and contacts with the rock sample 700 through the fixing frame 120. After the rock sample 700 is heated, the heat is transmitted from the fixing frame 120 and the extension rod 130 to the thermocouple 160, so that the thermocouple 160 can detect the heating temperature of the rock sample 700. It is easily understood that other types of temperature sensors can also be used to complete the temperature measurement of the rock sample 700.

[0060] Further, the sample loading platform 100 further comprises a first baffle 170 and a second baffle 180. The first baffle 170 is fixedly installed in the fixed frame 120 near one end of the first tube section 210, and the second baffle 180 is hingedly installed in the fixed frame 120 near one end of the second tube section 220. The first baffle 170 and the second baffle 180 serve to prevent the rock sample 700 from rolling along the length direction of the fixed frame 120, and also serve to reduce heat or cold loss. It is worth noting that when the fixed frame 120 enters the second tube section 220, the second baffle 180 can be laid down to facilitate the cooling device 400 to cool the rock sample 700. The second baffle 180 can be knocked down by the protruding structure on the inner wall of the experimental tube 200, or a connecting rod extending to the outside is used, and the user manually drives the second baffle 180 to be laid down by pulling the connecting rod.

[0061] Specifically, for the heating furnace 300, it is an open structure, and a plurality of arrayed iodine-tungsten lamp tubes are arranged inside to quickly heat and keep warm the rock sample 700. The specific heating temperature of the heating furnace 300 can be adjusted according to experimental requirements.

[0062] Specifically, in order to prevent the device components from being damaged due to deformation under the heating of the heating furnace 300, the fixed frame 120, the extension rod 130, the first baffle 170, the second baffle 180, and the experimental tube 200 are all made of quartz or other high-temperature-resistant materials.

[0063] Further, referring to Figure 4 , the monitoring device 500 comprises a fixed seat 510, a waveguide rod 520, a monitoring probe 530, and a telescopic power member 540. The fixed seat 510 is fixedly connected with the second tube section 220, the waveguide rod 520 is slidingly connected with the fixed seat 510 and one end thereof can extend into the second tube section 220 and contact the rock sample 700. The monitoring probe 530 is connected with the waveguide rod 520 to form acoustic conduction with the rock sample 700 through the waveguide rod 520, and the monitoring probe 530 can detect the cracking condition of the rock sample 700 under thermal shock through acoustic conduction. The telescopic power member 540 drives the waveguide rod 520 to slide, which can specifically use an electric telescopic rod, a pneumatic telescopic rod, a hydraulic telescopic rod, or a motor lead screw mechanism as a power source, and will not be described here.

[0064] The end of the waveguide rod 520 contacting the rock sample 700 is provided with a clamping piece, which is arc-shaped and has a plurality of protruding conical structures on the surface, for adapting to the uneven outer surface of the rock sample 700, so that the contact is more sufficient.

[0065] Referring to Figure 5The wave guide rod 520, the monitoring probe 530 and the telescopic power piece 540 jointly constitute a clamping assembly, and the number of clamping assemblies is multiple and is distributed in a circumferential array around the experimental tube 200. In this embodiment, the number of clamping assemblies is four. When the wave guide rod 520 of each clamping assembly is elongated, the rock sample 700 can be clamped together, on the one hand, the rock sample 700 can be stably fixed, and on the other hand, each monitoring probe 530 can detect different parts of the rock sample 700, so that the detection data is more reliable.

[0066] Further, the rock material thermal shock damage change monitoring device further comprises a valve 600, which is installed in the experimental tube 200 and arranged between the first tube section 210 and the second tube section 220. The valve 600 is used to control whether the first tube section 210 and the second tube section 220 are communicated, and when the valve 600 is closed, the communication between the first tube section 210 and the second tube section 220 can be cut off, so that when the rock sample 700 is heated in the first tube section 210, part of the heat is lost to the second tube section 220; when the valve 600 is opened, the fixed frame 120 carrying the rock sample 700 can pass through, so that the subsequent cooling operation is completed.

[0067] Optionally, the valve 600 is a ball valve. Referring to Figure 6 The valve 600 comprises a valve body 610, a ball 620, a valve rod 630 and an electric actuator 640. The valve body 610 is the main structure of the valve 600, the ball 620 is connected with the valve rod 630 and can rotate in the valve body 610 following the valve rod 630. A through hole is formed in the ball 620, when the ball 620 rotates so that the hole in the ball 620 corresponds to the openings on both sides of the valve body 610, the fixed frame 120 can pass through the valve 600 from the first tube section 210 to the second tube section 220. The electric actuator 640 is a power piece to drive the valve rod 630 to rotate.

[0068] Further, referring to Figure 7 The cooling device 400 comprises a cooling gas tank 410 and a blower 420. The cooling gas tank 410 is used to store cooling gas, the air inlet of the blower 420 is connected to the cooling gas tank 410, and the air outlet of the blower 420 is connected to the second tube section 220 of the experimental tube 200, so that when the blower 420 is started, the cooling gas in the cooling gas tank 410 can be output to the second tube section 220, and the rock sample 700 is cooled in a air cooling manner.

[0069] Optionally, the cooling device 400 can further be provided with a gas recovery device 430 to recover the cooled gas. The gas recovery device 430 is connected to the experimental tube 200 through a pipeline, and specifically can be connected to the pressure relief valve 150, so that the heat-exchanged gas is recovered.

[0070] Further, the monitoring device 500 further comprises a camera 550, an image acquisition system 560 and a data acquisition instrument 570, the side of the second pipe section 220 is provided with an observation window, the camera 550 can shoot the surface change of the rock sample 700 through the observation window, the image acquisition system 560 is electrically connected with the camera 550 to acquire images and identify and analyze the images. The data acquisition instrument 570 is electrically connected with each monitoring probe 530 to decode and convert the received acoustic signals into experimental data.

[0071] The experimental method in the second aspect of the present application is based on the rock material thermal shock damage change monitoring device, and comprises the following steps:

[0072] S100. The rock sample 700 is fixed on the fixing frame 120.

[0073] S200. The sample loading platform 100 is started, and the fixing frame 120 carrying the rock sample 700 is pushed into the first pipe section 210 of the experimental pipe 200 by the slide rail 110.

[0074] S300. The heating furnace 300 is started, and the rock sample 700 in the first pipe section 210 is heated.

[0075] S400. After heating, if the valve 600 is provided, the valve 600 is opened, and the fixing frame 120 carrying the rock sample 700 is pushed into the second pipe section 220 of the experimental pipe 200 by the slide rail 110.

[0076] S500. The cooling device 400 is started, and the rock sample 700 in the second pipe section 220 is cooled, and the rock sample 700 is subjected to thermal shock.

[0077] S600. The monitoring device 500 records the surface change of the rock sample 700, and collects experimental data.

[0078] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of ordinary skilled in the art without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A device for monitoring changes in thermal shock damage of a rock material, characterized by, The rock material thermal shock damage change monitoring device comprises a sample loading platform, an experimental tube, a heating furnace, a cooling device, and a monitoring device. The sample loading platform comprises a sliding rail and a fixing frame installed on the sliding rail, and the fixing frame is used for fixing a rock sample. The experimental tube comprises a first tube section and a second tube section connected in communication, and the sliding rail can drive the fixing frame to shuttle between the first tube section and the second tube section. The heating furnace is installed on the first tube section and heats the internal space of the first tube section. The cooling device is installed on the second tube section and cools the internal space of the second tube section. The monitoring device is connected with the second tube section. The fixing frame is provided with a plurality of hollow structures to enable each surface of the rock sample placed thereon to be fully heated or cooled. The sample loading platform drives the rock sample to enter the first tube section and the second tube section in sequence, and the rock sample is subjected to thermal shock after being heated and rapidly cooled. The monitoring device monitors the surface damage change of the rock sample after being subjected to thermal shock in the second tube section.

2. The apparatus of claim 1, wherein: The sample loading platform further comprises a first baffle and a second baffle.

3. The apparatus of claim 1, wherein: The first baffle is fixedly installed on one end of the fixing frame close to the first tube section.

4. The apparatus of claim 3, wherein: The second baffle is hingedly connected to one end of the fixing frame close to the second tube section.

5. The apparatus of claim 3, wherein: The second baffle can be laid down when the fixing frame enters the second tube section.

6. The apparatus of claim 1, wherein: The monitoring device comprises a fixing seat, a waveguide rod, a monitoring probe, and an extension power element. The fixing seat is fixedly connected with the second tube section. One end of the waveguide rod is in sliding connection with the fixing seat and can extend into the second tube section and contact the rock sample. The monitoring probe is connected with the waveguide rod to form acoustic conduction with the rock sample through the waveguide rod. The extension power element drives the waveguide rod to slide. The rock material thermal shock damage change monitoring device further comprises a valve. The valve is installed in the experimental tube and arranged between the first tube section and the second tube section. The valve can cut off the communication between the first tube section and the second tube section when closed, and the fixing frame carrying the rock sample can pass through when the valve is opened. The sample loading platform further comprises an extension rod and a sealing flange. The extension rod is connected to the sliding rail and the fixing frame at two ends respectively. The sealing flange is installed at the end of the first tube section of the experimental tube and is provided with a through hole through which the extension rod passes. The sample loading platform further comprises a pressure relief valve. The pressure relief valve is installed on the sealing flange to discharge high-temperature gas in the first tube section. The sample loading platform further comprises a thermocouple. The thermocouple is installed on the extension rod and contacts the rock sample through the fixing frame to detect the heating temperature of the rock sample. The cooling device comprises a cooling gas tank and a blower. The air inlet of the blower is connected to the cooling gas tank, and the air outlet of the blower is connected to the second tube section of the experimental tube.

7. The apparatus of claim 1, wherein: The monitoring device further comprises a camera and an image acquisition system, the side of the second pipe section is provided with an observation window, the camera can shoot the surface change of the rock sample through the observation window, and the image acquisition system is electrically connected with the camera to acquire images and identify and analyze the images.

8. An experimental method based on the rock material thermal shock damage change monitoring device according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: fixing the rock sample on the fixing frame; starting the sample loading platform, and pushing the fixing frame carrying the rock sample into the first pipe section of the experimental pipe through the slide rail; starting the heating furnace to heat the rock sample in the first pipe section; after heating, pushing the fixing frame carrying the rock sample into the second pipe section of the experimental pipe through the slide rail; starting the cooling device to cool the rock sample in the second pipe section, and the rock sample is subjected to thermal shock; The monitoring device records the surface change of the rock sample and collects experimental data.

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