Rock material thermal shock damage change monitoring device and experimental method

Abstract

The invention discloses a rock material thermal shock damage change monitoring device and an experimental method.The device comprises a sample loading platform which comprises a sliding rail and a fixing frame installed on the sliding rail; the experiment tube comprises a first tube section and a second tube section which are communicated with each other, 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 mounted on the first pipe section and is used for heating the rock sample; the cooling device is mounted on the second pipe section and is used for cooling the rock sample; the monitoring device is connected with the second pipe section and is used for monitoring the surface damage change condition of the rock sample subjected to thermal shock. The rock sample is driven by the sample loading platform to sequentially enter the first pipe section and the second pipe section of the experiment pipe, the rock sample is heated by the heating furnace at the first pipe section and cooled by the cooling device at the second pipe section, so that the rock sample generates a thermal shock phenomenon, and the surface change condition of the rock sample is recorded by the monitoring device. The rock thermal shock damage experiment is completed.

Description

Technical Field

[0001] The invention relates to the technical field of rock thermal shock experiments, and in particular to a rock material thermal shock damage change monitoring device and an experimental method. Background Art

[0002] As shallow resources are gradually exhausted, human resource development is continuously extending to the deep earth. Under the combined effects of thermal activities and geological processes such as radioactive decay, magmatic activity, and plate tectonic movement, the temperature of rock layers usually increases with depth at a geothermal gradient of 30 to 50°C / km. In faults or abnormal areas with high thermal conductivity, the geothermal gradient can be as high as 200°C / km. In the process of development and utilization of deep resources, high-temperature rock masses are not always at a relatively stable temperature, and sometimes experience rapid changes in temperature. The thermal stress generated in the rock by such rapid temperature changes will lead to the initiation and development of thermal cracks, which in turn affect the physical and mechanical properties of the rock. This process is called thermal shock.

[0003] The thermal shock phenomenon that occurs in high-temperature rock mass not only facilitates the exploitation of deep resources, but also poses a threat to the safety of rock engineering. For example, during deep drilling, the drilling fluid cools the drill bit while also exerting thermal shock on the surrounding rock, increasing the number of thermal cracks in the surrounding rock. On the one hand, this improves the rock breaking effect and makes drilling easier, but on the other hand, it also damages the well wall, causing the degradation of the rock mass and creating 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 complete experimental method and a matching experimental platform that can accurately capture these damage changes, it is still difficult to quantitatively characterize the distribution of internal damage cracks in rocks during thermal shock, which hinders people's in-depth understanding of the mechanism of action of thermal shock damage to rocks. Summary of the invention

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

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

[0007] A device for monitoring changes in thermal shock damage of rock materials according to an embodiment of the first aspect of the present invention comprises:

[0008] A sample loading platform, comprising a slide rail and a fixing frame mounted on the slide rail, wherein the fixing frame is used to fix the rock sample;

[0009] An experimental tube, the experimental tube comprising a first tube section and a second tube section connected to each other, 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, the heating furnace being installed in the first pipe section and heating the inner space of the first pipe section;

[0011] a cooling device, the cooling device being installed on the second pipe segment and cooling the inner space of the second pipe segment;

[0012] a monitoring device connected to the second pipe section;

[0013] The sample loading platform drives the rock sample to enter the first pipe section and the second pipe section successively, and the rock sample is subjected to thermal shock after being heated and rapidly cooled. The monitoring device monitors the surface damage changes of the rock sample after being subjected to thermal shock in the second pipe section.

[0014] The device for monitoring changes in thermal shock damage of rock materials according to an embodiment of the present invention has at least the following beneficial effects: the rock sample, driven by the sample loading platform, successively enters the first pipe section and the second pipe section of the experimental tube, wherein the rock sample is heated by the heating furnace in the first pipe section, and is cooled by the cooling device in the second pipe section, so that the rock sample produces thermal shock phenomenon under the heating and cooling, and the monitoring device is used to record the surface changes of the rock sample under thermal shock, thereby completing the rock thermal shock damage experiment.

[0015] According to some embodiments of the present invention, the rock material thermal shock damage change monitoring device also includes a valve, which is installed in the experimental tube and arranged between the first pipe section and the second pipe section. When the valve is closed, the connection between the first pipe section and the second pipe section can be cut off, and when the valve is opened, the fixing frame carrying the rock sample can pass through.

[0016] According to some embodiments of the present invention, the sample loading platform also includes an extension rod and a sealing flange, the two ends of the extension rod are respectively connected to the slide rail and the fixed frame, the sealing flange is installed at the end of the first pipe section of the experimental tube, and the sealing flange is provided with a through hole for the extension rod to pass through.

[0017] According to some embodiments of the present invention, the sample loading platform further includes a pressure relief valve, which is installed on the sealing flange to discharge the high-temperature gas in the first pipe section in a timely manner.

[0018] According to some embodiments of the present invention, the sample loading platform further comprises a thermocouple, which is mounted on the extension rod and contacts the rock sample through the fixing frame, and is used to detect the heating temperature of the rock sample.

[0019] According to some embodiments of the present invention, the sample loading platform also includes a first baffle and a second baffle, the first baffle being fixedly installed at one end of the fixed frame close to the first pipe segment, the second baffle being hinged at one end of the fixed frame close to the second pipe segment, and the second baffle being able to be laid down when the fixed frame enters the second pipe segment.

[0020] According to some embodiments of the present invention, the cooling device includes a cooling gas tank and a blower, wherein an air inlet of the blower is connected to the cooling gas tank, and an air outlet of the blower is connected to the second pipe section of the experimental tube.

[0021] According to some embodiments of the present invention, the monitoring device includes a fixed seat, a waveguide rod, a monitoring probe and a telescopic power piece, the fixed seat is fixedly connected to the second pipe segment, the waveguide rod is slidably connected to the fixed seat and one end of which can extend into the second pipe segment and contact the rock sample, the monitoring probe is connected to the waveguide rod to form sound conduction with the rock sample through the waveguide rod, and the telescopic power piece drives the waveguide rod to slide.

[0022] According to some embodiments of the present invention, the monitoring device also includes a camera and an image acquisition system. An observation window is provided on the side of the second pipe segment. The camera can photograph the surface changes of the rock sample through the observation window. The image acquisition system is 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 invention is based on the above rock material thermal shock damage change monitoring device and includes the following steps:

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

[0025] Starting the sample loading platform, and using the slide rail to push the fixing frame carrying the rock sample into the first pipe section of the experimental tube;

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

[0027] After heating is completed, the fixing frame carrying the rock sample is pushed 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, so that the rock sample is subjected to thermal shock;

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

[0030] The experimental method according to the embodiment of the present invention has at least the following beneficial effects: when conducting experiments using the device for monitoring changes in thermal shock damage of rock materials, the rock sample can be quickly sent to the second pipe section for cooling after being heated, thereby reducing heat loss during the transfer process, thereby making the thermal shock effect more obvious and the surface damage of the rock sample easier to monitor.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0033] Figure 1 A three-dimensional diagram of a device for monitoring changes in thermal shock damage of rock materials according to an embodiment of the present invention;

[0034] Figure 2 A three-dimensional diagram of a sample loading platform 100 in a device for monitoring changes in thermal shock damage of rock materials according to an embodiment of the present invention;

[0035] Figure 3 This is a front view of a sample loading platform 100 in a device for monitoring changes in thermal shock damage of rock materials according to an embodiment of the present invention;

[0036] Figure 4 It is a cross-sectional view of a monitoring device 500 in a device for monitoring changes in thermal shock damage of rock materials according to an embodiment of the present invention;

[0037] Figure 5 It is a side view of the monitoring device 500 in the device for monitoring changes in thermal shock damage of rock materials according to an embodiment of the present invention;

[0038] Figure 6 It is a cross-sectional view of a valve 600 in a device for monitoring changes in thermal shock damage of rock materials according to an embodiment of the present invention;

[0039] Figure 7 The figure is a schematic diagram of the circuit connection of the device for monitoring changes in thermal shock damage of rock materials according to an embodiment of the present invention.

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

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0044] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0045] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0046] The thermal shock phenomenon that occurs in high-temperature rock mass not only facilitates the exploitation of deep resources, but also poses a threat to the safety of rock engineering. For example, during deep drilling, the drilling fluid cools the drill bit while also exerting thermal shock on the surrounding rock, increasing the number of thermal cracks in the surrounding rock. On the one hand, this improves the rock breaking effect and makes drilling easier, but on the other hand, it also damages the well wall, causing the degradation of the rock mass and creating 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 a complete experimental method and a matching experimental platform that can accurately capture these damage changes, it is still difficult to quantitatively characterize the distribution of internal damage cracks in rocks during thermal shock, which hinders people's in-depth understanding of the mechanism of action of thermal shock damage to rocks.

[0048] In this regard, the present application proposes a device for monitoring changes in thermal shock damage of rock materials. Driven by a sample loading platform 100, a rock sample 700 successively enters a first pipe section 210 and a second pipe section 220 of an experimental tube 200. In the first pipe section 210, the rock sample 700 is heated by a heating furnace 300, and in the second pipe section 220, the rock sample 700 is cooled by a cooling device 400. The heating and cooling cause thermal shock to the rock sample 700. The monitoring device 500 is used to record the surface changes of the rock sample 700 under thermal shock to complete the rock thermal shock damage experiment.

[0049] In addition, the present application also proposes an experimental method based on the above-mentioned rock material thermal shock damage change monitoring device. After the rock sample 700 is heated, it can be quickly sent to the second pipe section 220 for cooling, reducing heat loss during the transfer process, thereby making the thermal shock effect more obvious and the surface damage of the rock sample 700 easier to monitor.

[0050] Reference Figure 1The rock material thermal shock damage change monitoring device of the first embodiment of the present application includes 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 one hot and one cold. The monitoring device 500 is used to detect the rock sample 700 and collect experimental data.

[0051] Specifically, refer to Figure 2 The sample loading platform 100 includes a slide rail 110 and a fixing frame 120 installed on the slide 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 slide rail 110 .

[0052] The experimental tube 200 includes a first tube section 210 and a second tube section 220 that are connected, and the slide 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 installed on the first tube section 210 and heats the internal space of the first tube section 210, the cooling device 400 is installed on the second tube section 220 and cools the internal space of the second tube section 220, and the monitoring device 500 is connected to the second tube section 220 and is 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 pipe section 210 and the second pipe section 220 successively, and the rock sample 700 is heated in the first pipe section 210 and rapidly cooled in the second pipe section 220, thereby generating a thermal shock effect. The monitoring device 500 monitors the surface damage changes of the rock sample 700 after being subjected to thermal shock in the second pipe section 220.

[0054] Specifically, the fixing frame 120 is provided with a plurality of hollow structures so that each surface of the rock sample 700 placed thereon is fully heated or cooled. The fixing frame 120 is also provided with a plurality of conical protrusions 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 for the specific structure of the slide rail 110, it can use an electric telescopic rod, a pneumatic telescopic rod, a hydraulic telescopic rod or other linear drive components to apply a horizontal force to the fixed frame 120. Figure 3The slide rail 110 specifically includes a motor 111, a screw rod 112 and a screw rod seat 113. The output shaft of the motor 111 is connected to the screw rod 112, the screw rod seat 113 is provided with a threaded hole adapted to the screw rod 112, and the fixing frame 120 is connected to the screw rod seat 113. Therefore, when the output shaft of the motor 111 rotates, the fixing frame 120 can be driven to move by the screw rod mechanism.

[0056] Furthermore, the sample loading platform 100 also includes an extension rod 130 and a sealing flange 140. The two ends of the extension rod 130 are respectively connected to the slide rail 110 and the fixing frame 120, which enables the fixing frame 120 to penetrate into the interior of the experimental tube 200. The sealing flange 140 is installed at the end of the first pipe section 210 of the experimental tube 200, and is used to seal the end of the first pipe section 210 to reduce heat loss. The sealing flange 140 is provided with a through hole for the extension rod 130 to pass through, thereby reducing the impact on the movement of the extension rod 130.

[0057] Optionally, the sealing flange 140 is connected to the test tube 200 in a detachable connection manner, specifically, in a bolted connection manner.

[0058] Furthermore, the sample loading platform 100 further includes 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 pipe section 210, so that when the gas pressure in the first pipe section 210 is too high, the high-temperature gas in the first pipe section 210 can be discharged in time.

[0059] Furthermore, the sample loading platform 100 further includes a thermocouple 160, which is mounted on the extension rod 130 and contacts the rock sample 700 through the fixing frame 120. After the rock sample 700 is heated, its heat is transferred 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 easy to understand that other types of temperature sensors can also be used to complete the temperature measurement of the rock sample 700.

[0060] Furthermore, the sample loading platform 100 also includes a first baffle 170 and a second baffle 180. The first baffle 170 is fixedly installed at one end of the fixing frame 120 close to the first pipe section 210, and the second baffle 180 is hinged at one end of the fixing frame 120 close to the second pipe section 220. The first baffle 170 and the second baffle 180 are used to prevent the rock sample 700 from rolling down along the length direction of the fixing frame 120, and also play a role in reducing the loss of heat or cold. It is worth noting that when the fixing frame 120 enters the second pipe section 220, the second baffle 180 can be knocked down, so as 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 by using a connecting rod extending to the outside, the user manually drives the second baffle 180 to be knocked down by turning the connecting rod.

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

[0062] Specifically, in order to prevent the device components from being deformed and damaged when heated by the heating furnace 300, the fixing 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, refer to Figure 4 The monitoring device 500 includes a fixed seat 510, a waveguide rod 520, a monitoring probe 530 and a telescopic power piece 540. The fixed seat 510 is fixedly connected to the second pipe section 220, the waveguide rod 520 is slidably connected to the fixed seat 510 and one end of the waveguide rod 520 can be inserted into the second pipe section 220 and contact the rock sample 700. The monitoring probe 530 is connected to the waveguide rod 520 to form sound conduction with the rock sample 700 through the waveguide rod 520, and the monitoring probe 530 can detect the cracking of the rock sample 700 under thermal shock through sound wave conduction. The telescopic power piece 540 drives the waveguide rod 520 to slide, and it can specifically use an electric telescopic rod, a pneumatic telescopic rod, a hydraulic telescopic rod or a motor screw mechanism as a power source, which will not be repeated here.

[0064] One end of the waveguide rod 520 that contacts the rock sample 700 is provided with a clamping piece, which is arc-shaped and has a plurality of raised conical structures on the surface, so as to adapt to the uneven surface of the rock sample 700 and make the contact more complete.

[0065] Reference Figure 5The waveguide rod 520, the monitoring probe 530 and the telescopic power member 540 together constitute a clamping assembly. There are multiple clamping assemblies and they are distributed in a circular array around the experimental tube 200. In this embodiment, there are four clamping assemblies. When the waveguide rods 520 of each clamping assembly are extended, they can clamp the rock sample 700 together. On the one hand, the rock sample 700 can be stably fixed. On the other hand, each monitoring probe 530 can detect different parts of the rock sample 700, making the detection data more reliable.

[0066] Furthermore, the rock material thermal shock damage change monitoring device also includes 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 connected. When the valve 600 is closed, the connection between the first tube section 210 and the second tube section 220 can be cut off, thereby preventing part of the heat of the rock sample 700 from being lost to the second tube section 220 when it is heated in the first tube section 210; when the valve 600 is opened, the fixed frame 120 carrying the rock sample 700 can pass through, thereby completing the subsequent cooling operation.

[0067] Optionally, the valve 600 is a ball valve. Figure 6 The valve 600 includes a valve body 610, a ball 620, a valve stem 630 and an electric actuator 640. The valve body 610 is the main structure of the valve 600. The ball 620 is connected to the valve stem 630 and can rotate in the valve body 610 following the valve stem 630. A through hole is provided 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 fixing frame 120 can pass through the valve 600 from the first pipe section 210 to the second pipe section 220. The electric actuator 640 is a power component to drive the valve stem 630 to rotate.

[0068] Further, refer to Figure 7 The cooling device 400 includes 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 pipe section 220 of the experimental tube 200, so that after the blower 420 is started, the cooling gas in the cooling gas tank 410 can be output to the second pipe section 220, and the rock sample 700 is cooled by air cooling.

[0069] Optionally, the cooling device 400 may also 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 may be connected to the pressure relief valve 150, so as to recover the gas after heat exchange.

[0070] Furthermore, the monitoring device 500 also includes a camera 550, an image acquisition system 560 and a data acquisition instrument 570. An observation window is provided on the side of the second pipe section 220. The camera 550 can photograph the surface changes of the rock sample 700 through the observation window. The image acquisition system 560 is electrically connected to the camera 550 to obtain images and identify and analyze the images. The data acquisition instrument 570 is electrically connected to each monitoring probe 530 to decode the received acoustic signal and convert it into experimental data.

[0071] An experimental method in an embodiment of the second aspect of the present application is performed based on the above-mentioned rock material thermal shock damage change monitoring device, comprising the following steps:

[0072] S100. Fixing the rock sample 700 to the fixing frame 120;

[0073] S200. Start the sample loading platform 100, and push the fixing frame 120 carrying the rock sample 700 into the first tube section 210 of the experimental tube 200 using the slide rail 110;

[0074] S300. Turn on the heating furnace 300 to heat the rock sample 700 in the first pipe section 210;

[0075] S400. After heating is completed, if a 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 tube 200 by means of the slide rail 110;

[0076] S500. Turn on the cooling device 400 to cool the rock sample 700 in the second pipe section 220, so that the rock sample 700 is subjected to thermal shock;

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

[0078] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention 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 rock materials, characterized in that: include: A sample loading platform, comprising a slide rail and a fixing frame mounted on the slide rail, wherein the fixing frame is used to fix the rock sample; An experimental tube, the experimental tube comprising a first tube section and a second tube section connected to each other, the slide rail being capable of driving the fixing frame to shuttle between the first tube section and the second tube section; a heating furnace, the heating furnace being installed in the first pipe section and heating the inner space of the first pipe section; a cooling device, the cooling device being installed on the second pipe segment and cooling the inner space of the second pipe segment; a monitoring device connected to the second pipe section; The sample loading platform drives the rock sample to enter the first pipe section and the second pipe section successively, and the rock sample is subjected to thermal shock after being heated and rapidly cooled. The monitoring device monitors the surface damage changes of the rock sample after being subjected to thermal shock in the second pipe section.

2. The rock material thermal shock damage change monitoring device according to claim 1 is characterized in that: The rock material thermal shock damage change monitoring device also includes a valve, which is installed in the experimental tube and arranged between the first tube section and the second tube section. When the valve is closed, the connection between the first tube section and the second tube section can be cut off, and when the valve is opened, the fixing frame carrying the rock sample can pass through.

3. The rock material thermal shock damage change monitoring device according to claim 1 is characterized in that: The sample loading platform also includes an extension rod and a sealing flange, wherein both ends of the extension rod are respectively connected to the slide rail and the fixing frame, and the sealing flange is installed at the end of the first pipe section of the experimental tube, and the sealing flange is provided with a through hole for the extension rod to pass through.

4. The rock material thermal shock damage change monitoring device according to claim 3 is characterized in that: The sample loading platform further includes a pressure relief valve, which is installed on the sealing flange to timely discharge the high-temperature gas in the first pipe section.

5. The rock material thermal shock damage change monitoring device according to claim 3 is characterized in that: The sample loading platform further comprises a thermocouple, which is mounted on the extension rod and contacts the rock sample through the fixing frame, and is used for detecting the heating temperature of the rock sample.

6. The rock material thermal shock damage change monitoring device according to claim 1 is characterized in that: The sample loading platform also includes a first baffle and a second baffle. The first baffle is fixedly installed on one end of the fixing frame close to the first pipe section, and the second baffle is hinged on one end of the fixing frame close to the second pipe section. The second baffle can be laid down when the fixing frame enters the second pipe section.

7. The rock material thermal shock damage change monitoring device according to claim 1 is characterized in that: The cooling device comprises a cooling gas tank and a blower, wherein an air inlet of the blower is connected to the cooling gas tank, and an air outlet of the blower is connected to the second pipe section of the experimental tube.

8. The rock material thermal shock damage change monitoring device according to claim 1 is characterized in that: The monitoring device includes a fixed seat, a waveguide rod, a monitoring probe and a telescopic power piece. The fixed seat is fixedly connected to the second pipe section, the waveguide rod is slidably connected to the fixed seat and one end of the waveguide rod can extend into the second pipe section and contact the rock sample, the monitoring probe is connected to the waveguide rod to form sound conduction with the rock sample through the waveguide rod, and the telescopic power piece drives the waveguide rod to slide.

9. The rock material thermal shock damage change monitoring device according to claim 8, characterized in that: The monitoring device also includes a camera and an image acquisition system. An observation window is provided on the side of the second pipe section. The camera can photograph the surface changes of the rock sample through the observation window. The image acquisition system is electrically connected to the camera to acquire images and identify and analyze the images.

10. An experimental method based on the rock material thermal shock damage change monitoring device according to any one of claims 1 to 9, characterized in that: include: Fixing the rock sample on the fixing frame; Starting the sample loading platform, and using the slide rail to push the fixing frame carrying the rock sample into the first pipe section of the experimental tube; Turning on the heating furnace to heat the rock sample in the first pipe section; After heating is completed, the fixing frame carrying the rock sample is pushed into the second pipe section of the experimental pipe by using the slide rail; Turning on the cooling device to cool the rock sample in the second pipe section, so that the rock sample is subjected to thermal shock; The monitoring device records the surface changes of the rock sample and collects experimental data.

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