Deep coal rock disturbance destruction test device considering hydrothermal coupling effect

Abstract

A deep coal rock disturbance destruction test device considering hydrothermal coupling effect is characterized by comprising a loading system, a temperature control system, a humidity control system and a multi-physical-quantity monitoring system, the loading system comprises a static load / disturbance system, a pressure head and a constant-temperature and constant-humidity protective cover, and the temperature control system comprises a temperature control system, a humidity control system and a multi-physical-quantity monitoring system. The temperature control system comprises a temperature sensor, a temperature controller, a temperature actuator and a temperature display; the humidity control system comprises a humidity sensor, a humidity controller, a humidity actuator and a humidity display; the multi-physical-quantity monitoring system comprises an acoustic emission monitoring system, a strain monitoring system, a high-speed camera shooting system and a thermal infrared monitoring system. The device can effectively control the temperature and the humidity in the coal rock damage process, can truly reflect the occurrence state of deep coal rock in the coal mining process, and can analyze multi-parameter response characteristics in disturbance damage of the deep coal rock; and a theoretical basis is provided for early warning and prevention of deep coal rock dynamic disasters.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal rock mechanics test field especially, and relates to a kind of deep coal rock disturbance damage test device under considering water-heat coupling. BACKGROUND

[0002] Coal as the main energy position in China is difficult to change in short term, give full play to the bottom role of coal safe supply, to guarantee the major practical demand of national energy security.In recent years, with the consumption of shallow coal resources, coal mines successively enter deep mining stage;Deep mining faces the complex environment of high stress, high temperature, high karst water pressure and strong mining disturbance, is extremely easy to induce coal rock dynamic disaster, causes serious damage and personnel casualty.Therefore, coal rock dynamic disaster has become the bottleneck of restricting coal mine safety and efficient production.Different from shallow mining, deep mining will inevitably encounter the problem that ground temperature gradually increases with depth;At the same time, deep surrounding rock will also be affected by underground water and mining disturbance.Therefore, the influence of water, heat and mining disturbance on coal rock cannot be ignored when studying deep coal rock dynamic disaster.

[0003] Deep coal rock is in complex water-heat field environment for a long time, and is affected by mining disturbance in mining process, partial coal rock is destroyed, so as to cause the overall instability of coal rock structure.The research on the influence of water and heat on the physical and mechanical properties of coal rock material has been widely concerned by domestic and foreign scholars, but the previous research considers the influence of single factor in water-heat, and the temperature is as high as several hundred degrees Celsius;Cannot truly reflect the occurrence state of deep coal rock in coal mining process, and deep coal rock will be affected by roof breakage, blasting and other disturbance in actual mining process, and most of the previous test devices cannot consider the disturbance damage characteristics of deep coal rock under water-heat coupling. UTILITY MODEL CONTENT

[0004] In view of the above technical problems of prior art, the utility model aims at providing a deep coal rock disturbance damage test device under water-heat coupling, which can consider the influence of water, heat and mining disturbance on the damage characteristics of coal rock, so as to provide theoretical basis for deep coal rock dynamic disaster early warning and prevention.

[0005] To achieve the above purpose, the utility model provides a deep coal rock disturbance damage test device under water-heat coupling, which comprises a loading system, a temperature control system, a humidity control system and a multi-physical quantity monitoring system, wherein:

[0006] The loading system comprises a static load / disturbance system, a pressure head and a constant temperature and humidity protective cover, the pressure head plays the role of fixing and connecting the static load / disturbance system and the sample, and the constant temperature and humidity protective cover plays the role of isolating the temperature and humidity exchange with the external environment;

[0007] The temperature control system comprises a temperature sensor, a temperature controller, a temperature executor and a temperature display; the temperature sensor adopts a thermistor; the temperature controller is mainly used for receiving a temperature signal sent by the sensor and comparing the temperature signal with a preset temperature value, according to a comparison result, the controller will issue a corresponding instruction to adjust a working state of a heater or a cooler to realize accurate temperature control; the temperature executor adopts the heater and the cooler to execute heating or cooling operation; the temperature display is connected with the temperature controller through wires;

[0008] The humidity control system comprises a humidity sensor, a humidity controller, a humidity executor and a humidity display; the humidity sensor adopts a resistance humidity sensor; the humidity controller is mainly used for receiving a signal sent by the humidity sensor and comparing the signal with a preset humidity value, according to a comparison result, the controller will issue a corresponding instruction to adjust a working state of a humidifier or a dehumidifier to maintain stable humidity; the humidity executor adopts the humidifier and the dehumidifier to execute humidification or dehumidification operation; the humidity display is connected with the humidity controller through wires;

[0009] The multi-physical quantity monitoring system comprises an acoustic emission monitoring system, a strain monitoring system, a high-speed camera system and a thermal infrared monitoring system; the acoustic emission monitoring system comprises an acoustic emission sensor, an amplifier and an acoustic emission host, the acoustic emission sensor and the amplifier and the amplifier and the acoustic emission host are connected through wires; the strain monitoring system comprises a strain gauge and a strain collector, the strain gauge and the strain collector are connected through wires; the high-speed camera system comprises a high-speed camera and a high-speed photo storage, the high-speed camera and the high-speed photo storage are connected through wires; the thermal infrared monitoring system comprises a thermal infrared camera and an infrared photo storage, the thermal infrared camera and the infrared photo storage are connected through wires.

[0010] Preferably, the static load and the disturbance load are loaded by an MTS e45305 electronic universal testing machine, and two loading modes of stress and displacement can be selected during the test, wherein the disturbance load can be set with different disturbance frequencies and amplitudes.

[0011] The deep coal rock disturbance damage test device considering the hydrothermal coupling effect has the advantages that the device can effectively control the temperature and humidity in the coal rock damage process, can truly reflect the occurrence state of the deep coal rock in the coal mining process, and can analyze the multi-parameter response characteristics in the deep coal rock disturbance damage; the device has simple structure, convenient operation and good safety. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic view of the test device of the utility model;

[0013] Figure 2 It is a disturbance damage test loading path described in the utility model;

[0014] Figure 3 The utility model provides acoustic emission sensor and strain gauge layout mode are described to the utility model;

[0015] The various reference numerals in the drawings are explained as follows:

[0016] 1-sample, 2-static load / disturbance system, 3-pressure head, 4-constant temperature and humidity protective cover, 5-temperature sensor, 6-temperature controller, 7-temperature executor, 8-heater, 9-refrigerator, 10-temperature display, 11-humidity sensor, 12-humidity controller, 13-humidity executor, 14-humidifier, 15-dehumidifier, 16-humidity display, 17-acoustic emission sensor, 18-amplifier, 19-acoustic emission host, 20-strain gauge, 21-strain collector, 22-high-speed camera, 23-high-speed photo memory, 24-thermal infrared camera, 25-infrared photo memory. DETAILED DESCRIPTION

[0017] The following reference description drawings introduce the multiple preferred embodiments of the utility model, make its technical content more clear and convenient to understand. The utility model can be embodied by many different forms of embodiments, and the protection scope of the utility model is not limited to the embodiments mentioned in the text.

[0018] In the drawings, the components of the same structure are indicated with the same reference numerals, and the components similar in structure or function are indicated with similar reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the utility model does not limit the size and thickness of each component. In order to make the drawing clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0019] In combination Figure 1 And Figure 3 , the test device described in the utility model is assembled, and the specific component composition and connection mode of each system are as follows:

[0020] The loading system includes the static load / disturbance system 2, the pressure head 3, and is built-in in the constant temperature and humidity protective cover 4.

[0021] The static load and disturbance load involved in the working process of the static load / disturbance system 2 are loaded by the MTS e45305 electronic universal testing machine, and two loading modes of stress and displacement can be selected during the test, wherein the disturbance load can be set with different disturbance frequencies and amplitudes.

[0022] The temperature control system comprises a temperature sensor 5, a temperature controller 6, a temperature actuator 7 and a temperature display 10: the temperature sensor 6 is made of a thermistor; the temperature controller 6 is mainly used for receiving the temperature signal sent by the sensor and comparing with the preset temperature value, according to the comparison result, the temperature controller 6 will issue corresponding instructions to adjust the working state of the heater 8 or the cooler 9, so as to realize the accurate control of the temperature; the temperature actuator 7 comprises the heater 8 and the cooler 9, and executes the heating or cooling operation; the temperature display 10 is connected with the temperature controller 6 through wires.

[0023] The humidity control system comprises a humidity sensor 11, a humidity controller 12, a humidity actuator 13 and a humidity display 16: the humidity sensor 11 is made of a resistance humidity sensor; the humidity controller 12 is mainly used for receiving the signal sent by the humidity sensor and comparing with the preset humidity value, according to the comparison result, the humidity controller 12 will issue corresponding instructions to adjust the working state of the humidifier or the dehumidifier, so as to maintain the stability of the humidity; the humidity actuator 13 comprises the humidifier 14 and the dehumidifier 15, and executes the humidification or dehumidification operation; the humidity display 16 is connected with the humidity controller 12 through wires.

[0024] The multi-physical quantity monitoring system comprises an acoustic emission monitoring system, a strain monitoring system, a high-speed camera system and a thermal infrared monitoring system: the acoustic emission monitoring system comprises an acoustic emission sensor 17, an amplifier 18 and an acoustic emission host 19, and the acoustic emission sensor 17, the amplifier 18 and the acoustic emission host 19 are connected through wires; the strain monitoring system comprises a strain gauge 20 and a strain collector 21, and the strain gauge 20 and the strain collector 21 are connected through wires; the high-speed camera system comprises a high-speed camera 22 and a high-speed photo storage 23, and the two are connected through wires; the thermal infrared monitoring system comprises a thermal infrared camera 24 and an infrared photo storage 25, and the two are connected through wires.

[0025] The specific method used by the test device provided by the utility model is as follows: Figure 2 The sample preparation method provided by the embodiment comprises the following steps:

[0026] S1, designing and processing a sample 1;

[0027] S11, according to the method recommended by the International Society for Rock Mechanics, processing 48 groups of cubic samples 1 with a size of 50mm*50mm*50mm;

[0028] S12, divide the sample 1 into four groups, each group of 12 pieces, according to the following rules: Cu-0 / 3 / 5 / 7-25 / 50 / 75 / 100-1 / 2 / 3, wherein 0 / 3 / 5 / 7 respectively represent dry, saturated for 3 days, 5 days, 7 days, 25 / 50 / 75 / 100 respectively represent room temperature, heat treatment temperature is 50, 75, 100℃, 1 / 2 / 3 represents the sample 1 in this group number, such as: Cu-3-75-2 indicates the second piece of sample 1 in the saturated 3 days, 75℃ heat treatment sample;

[0029] S2, dry and saturated treatment of sample 1;

[0030] S21, according to the number, dry the dry group sample 1 in the electric heating air drying oven for 24h, and the remaining three groups are saturated, and the saturated time is 3, 5 and 7 days respectively;

[0031] S3, carry out the deep coal rock disturbance and damage test under the action of hydrothermal coupling;

[0032] S31, select a piece from the above dry and saturated sample 1, and arrange the acoustic emission sensor 17 and the strain gauge 20 according to the arrangement mode in Figure 2 , and combine Figure 1 to arrange the high-speed camera 22 and the thermal infrared camera 24;

[0033] S32, then, according to the numbering rule, the temperature control system is used for temperature control of the sample 1, and the temperature is heated from room temperature to the design temperature at a temperature increasing rate of 5℃ / min, and the temperature in the constant temperature and humidity protection cover 4 is kept constant;

[0034] S33, at the same time, the humidity control system is used for humidity control of the sample 1, the humidity environment is set to 40%, and the humidity in the constant temperature and humidity protection cover 4 is kept constant;

[0035] S34, after keeping constant temperature and humidity for 2 hours, first, the displacement loading mode is used to load to 60% of the uniaxial compressive strength of the sample 1, and the loading rate is set to 0.20mm / min; then, the load is kept for 20s; then, the sine wave loading is used until the sample 1 is damaged, and the amplitude and frequency are set to 30% and 1Hz of the uniaxial compressive strength respectively;

[0036] S34, the acoustic emission monitoring system, the strain monitoring system, the high-speed camera system and the thermal infrared monitoring system are used for synchronous capture of the deformation and damage characteristics of the coal body;

[0037] S35, after the sample 1 is damaged, the related data is stored;

[0038] S36, the damaged sample is taken out for the next group of experiments, and the test steps S31-S35 are repeated;

[0039] S37, after the experiment, the water heat coupling effect under the deep coal rock disturbance deformation and the multi-parameter response characteristics are analyzed, and then the relationship between the coal sample disturbance deformation and the multi-parameter response characteristics and the water heat coupling effect is analyzed.

[0040] It should be noted that the above only for the preferred embodiments of the present application, not to limit the scope of the present application. It should be noted that, any skilled in the art under the teachings of the present application, all equivalent substitutions, obvious deformation form, fall within the scope of the present application, should be protected by the present application.

Claims

1. A deep coal rock disturbance and destruction test device considering hydrothermal coupling, characterized in that, It comprises a loading system, a temperature control system, a humidity control system and a multi-physical quantity monitoring system, wherein: The loading system comprises a static load / disturbance system, a pressure head and a constant temperature and humidity protective cover, the pressure head serves to fix and connect the static load / disturbance system and the sample, and the constant temperature and humidity protective cover serves to isolate the temperature and humidity exchange with the external environment. The temperature control system comprises a temperature sensor, a temperature controller, a temperature actuator and a temperature display: the temperature sensor adopts a thermistor; the temperature controller is mainly used for receiving the temperature signal sent by the sensor and comparing with the preset temperature value, according to the comparison result, the controller will issue corresponding instructions to adjust the working state of the heater or the cooler to realize accurate temperature control; the temperature actuator adopts a heater and a cooler to execute heating or cooling operation; the temperature display is connected with the temperature controller through wires; The humidity control system comprises a humidity sensor, a humidity controller, a humidity actuator and a humidity display: the humidity sensor adopts a resistance type humidity sensor; the humidity controller is mainly used for receiving the signal sent by the humidity sensor and comparing with the preset humidity value, according to the comparison result, the controller will issue corresponding instructions to adjust the working state of the humidifier or the dehumidifier to maintain the stability of the humidity; the humidity actuator adopts a humidifier and a dehumidifier to execute humidification or dehumidification operation; the humidity display is connected with the humidity controller through wires; The multi-physical quantity monitoring system comprises an acoustic emission monitoring system, a strain monitoring system, a high-speed camera system and a thermal infrared monitoring system: the acoustic emission monitoring system comprises an acoustic emission sensor, an amplifier and an acoustic emission host, the acoustic emission sensor and the amplifier, the amplifier and the acoustic emission host are connected through wires; the strain monitoring system comprises a strain gauge and a strain collector, the strain gauge and the strain collector are connected through wires; the high-speed camera system comprises a high-speed camera and a high-speed photo storage, the high-speed camera and the high-speed photo storage are connected through wires; the thermal infrared monitoring system comprises a thermal infrared camera and an infrared photo storage, the thermal infrared camera and the infrared photo storage are connected through wires.

2. The test device according to claim 1, wherein: The static load and the disturbance load involved in the working process of the static load / disturbance system are loaded by an MTS e45305 electronic universal testing machine, and two loading modes of stress and displacement can be selected during the test, wherein the disturbance load can be set to different disturbance frequencies and amplitudes.

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