Coal rock triaxial in-situ dynamic load damage experiment system and method

Abstract

The application discloses a coal rock triaxial in-situ dynamic load damage experiment system and method, and relates to the field of coal rock triaxial in-situ dynamic load damage experiment system and method. The system comprises a triaxial in-situ static load loading system, an in-situ seismic wave loading device, a monitoring system and a computer. The triaxial in-situ static load loading system is used for applying axial compression and confining pressure to a coal rock sample to be measured, so that the sample is in a specific engineering buried depth stress state. The computer is used for controlling the in-situ seismic wave loading device to apply the same seismic wave as the real seismic wave of rock mass fracture to the sample in a pressure maintaining state. The monitoring system is used for monitoring the signals of the sample in the whole loading process. The monitoring signals are mined by the computer, and the damage characteristics of the coal rock sample under the in-situ dynamic and static load conditions are revealed. The application lays a foundation for studying the propagation law of seismic waves or mine seismic vibration waves in rock mass, revealing the damage characteristics of rock mass under the action of the seismic waves or the mine seismic vibration waves and early warning precursor information, and can guide the dynamic load support and early warning of deep underground engineering tunnels and roadways.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal rock dynamic load damage experiment, in particular to a coal rock triaxial in-situ dynamic load damage experiment system and method. BACKGROUND

[0002] With the rapid economic development, the demand for coal is also showing a sustained growth trend. One of the important means to increase coal production is to continuously increase the mining depth, but as the mining depth gradually increases, the dynamic load disturbance intensity of underground engineering coal rock is increasing, and the resulting danger is also increasing. The stability of the supporting structure of the surrounding rock of the underground engineering under dynamic load has always been a concern of many researchers. The surrounding rock supporting structure of coal rock often fails due to the unloading wave caused by rock mass excavation, as well as the vibration wave derived from roof failure, blasting, and fault slip stress wave in actual engineering. The stability control of the surrounding rock of the roadway under dynamic load has been widely concerned by domestic and foreign scholars.

[0003] At present, the traditional coal rock dynamic load damage experiment only simply applies impact load or time sequence single frequency harmonic wave load, which cannot truly restore the amplitude frequency dynamic change vibration wave load suffered by coal rock in the underground. However, with the increase of mining depth, the number of microseismic events increases, and the rock mass environment becomes more severe. The dynamic disaster risk possibility caused by the superposition of vibration wave and surrounding rock static load stress increases dramatically. Therefore, it is necessary to build a coal rock triaxial in-situ dynamic load damage experiment system and method to study the action law of real vibration wave load on rock mass under pressure maintaining state, reveal the rock mass failure mechanism under dynamic load, and analyze the propagation law of seismic wave in rock mass and the rock mass failure precursor information under deep dynamic and static load, so as to provide beneficial guidance for engineering support and early warning under the condition of "three high and one disturbance" in deep engineering. SUMMARY

[0004] The present application provides a coal rock triaxial in-situ dynamic load damage experiment system and method to solve the problem that the traditional coal rock dynamic load damage experiment only simply applies impact load, which cannot truly simulate the vibration wave suffered by coal rock in the underground. At the same time, the propagation law of seismic wave in rock mass is explored to lay a foundation for revealing the rock mass failure characteristics and early warning precursor information under dynamic load, and to guide the dynamic load support and early warning of deep underground engineering tunnels and roadways.

[0005] To solve the above technical problems, the present application provides the following technical solutions:

[0006] On the one hand, the present application provides a coal rock triaxial in-situ dynamic load damage experiment system, which comprises a triaxial in-situ static load loading system, an in-situ vibration wave loading device, a monitoring system, and a computer.

[0007] The in-situ seismic wave loading device and the monitoring system are in communication connection with the computer.

[0008] The triaxial in-situ static load loading system is used to apply axial pressure and confining pressure to the coal rock sample to be tested, so that the sample is in a specific engineering buried depth stress state; wherein the specific engineering buried depth stress state refers to the stress state of the sample being the same as the stress state of the real rock mass at the depth of the specific engineering, and remaining unchanged;

[0009] The in-situ seismic wave loading device refers to a device that can apply the field-collected rock mass fracture real seismic wave signal to the sample to be tested according to its inherent frequency and amplitude;

[0010] The computer is used to receive the field-collected rock mass fracture real seismic wave signal, and according to the field-collected rock mass fracture real seismic wave signal, control the in-situ seismic wave loading device to apply the same seismic wave as the field-collected rock mass fracture real seismic wave signal to the sample in the specific engineering buried depth stress state;

[0011] The monitoring system is used to monitor the preset type signal of the sample during the entire process of self-loading to fracture; and transmit the monitored preset type signal to the computer; and through the computer, the signal monitored by the monitoring system is mined to reveal the damage characteristics of the coal rock sample under the in-situ dynamic and static load conditions.

[0012] Further, the in-situ seismic wave loading device is perpendicular to the static load axial pressure loading axis direction in the triaxial in-situ static load loading system, and the in-situ seismic wave loading device and the axial pressure loading axis are not shared, which can ensure that the in-situ seismic wave loading device loads the sample with seismic waves while the sample is in the specific engineering buried depth stress state.

[0013] Further, the frequency range of the waveform applied by the in-situ seismic wave loading device is 5Hz-235Hz.

[0014] Further, the computer is built-in with a dynamic load control system, which is used to receive the field-collected rock mass fracture real seismic wave signal introduced, and according to the field-collected rock mass fracture real seismic wave signal, realize control of the in-situ seismic wave loading device to apply the amplitude-frequency dynamically changing seismic wave signal to the sample.

[0015] Further, when controlling the in-situ seismic wave loading device, the dynamic load control system analyzes the field-collected rock mass fracture real seismic wave signal introduced, and calculates a vibration mode, which is used to make the seismic wave signal of the in-situ seismic wave loading device acting on the sample the same as the field-collected rock mass fracture real seismic wave signal introduced, that is, to restore the in-situ seismic wave.

[0016] Further, the installation position of the in-situ seismic wave loading device when applying dynamic load to the sample is the periphery of the sample.

[0017] The in-situ seismic wave loading device applies dynamic load in a direct acting manner on the sample itself.

[0018] Further, the monitoring system comprises an acoustic emission sensor, an electromagnetic radiation sensor, a deformation sensor and a high-speed camera.

[0019] Further, the acoustic emission sensor is arranged on the sample and directly contacts the sample, and is used for monitoring acoustic emission energy and acoustic emission ring count during the entire process from self-imposed load to rupture of the sample.

[0020] The electromagnetic radiation sensor is arranged outside the sample and does not directly contact the sample, and is used for monitoring electromagnetic radiation intensity and electromagnetic radiation energy during the entire process from self-imposed load to rupture of the sample.

[0021] The deformation sensor and the high-speed camera are built in the triaxial in-situ static load loading system, and are used for monitoring the time of deformation occurrence, displacement deformation size, displacement deformation rate and deformation spatial position of the sample during the entire process from self-imposed load to rupture of the sample.

[0022] Further, the computer is built with a data analysis system, and the data analysis system is used for mining the signals monitored by the monitoring system, and revealing the damage characteristics of the coal rock sample under in-situ dynamic and static load conditions; wherein the damage characteristics of the coal rock sample include spatial damage position of the sample, time-space damage severity and damage directionality.

[0023] On the other hand, the application further provides a coal rock triaxial in-situ dynamic load damage experiment method realized by using the coal rock triaxial in-situ dynamic load damage experiment system, and the experiment method comprises the following steps:

[0024] Placing the coal rock sample to be tested in the triaxial in-situ static load loading system, designing a dynamic load position on the sample to install the in-situ seismic wave loading device, and designing a sensor position to install the monitoring system;

[0025] Applying axial pressure and confining pressure to the sample by the triaxial in-situ static load loading system, so that the sample is in a specific engineering buried depth stress state; wherein the specific engineering buried depth stress state means that the stress state of the sample is always the same as the stress state of the real rock mass at the depth of the specific engineering, and remains unchanged.

[0026] The in-situ rock mass breaking real vibration wave signal collected on site is input into a computer, and the computer controls the in-situ vibration wave loading device to apply the same vibration wave as the in-situ rock mass breaking real vibration wave signal to the sample in a specific engineering buried depth stress state, so as to realize dynamic load loading on the sample.

[0027] The preset type signal in the whole process of the sample from the self-applied load to the breaking is monitored through the monitoring system.

[0028] The computer is used to mine the monitored signal, and the coal rock sample damage characteristics under the in-situ dynamic and static load conditions are revealed.

[0029] The technical scheme provided by the present application has at least the following beneficial effects:

[0030] The present application performs dynamic load loading test on the sample based on the real recorded and saved real coal rock breaking original vibration wave. Meanwhile, the triaxial in-situ static load loading system and the in-situ vibration wave loading device of the present application break the disadvantages of the traditional dynamic load loading experimental equipment, realize the experimental simulation of the coal rock under the real stress in the underground, and further explore the propagation law of the real earthquake wave or mine earthquake vibration wave in the rock mass, reveal the rock mass damage characteristics and early warning precursor information under the action of the real earthquake wave or mine earthquake vibration wave, and can be used to guide the dynamic load support and early warning of the deep underground engineering tunnel and roadway. The technical scheme of the present application is particularly suitable for the evaluation of the coal rock dynamic load damage. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0032] Figure 1 is a schematic diagram of a coal rock triaxial in-situ dynamic load damage experimental system provided by the present embodiment;

[0033] Figure 2 is a flow chart of a coal rock triaxial in-situ dynamic load damage experimental method provided by the present embodiment. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will further describe the embodiments of the present application in combination with the drawings.

[0035] The present embodiment provides a coal rock triaxial in-situ dynamic load damage experimental system, which comprises a triaxial in-situ static load loading system and a triaxial in-situ vibration wave loading device. Figure 1As shown, the system comprises a triaxial in-situ static load loading system, an in-situ seismic wave loading device, a monitoring system and a computer; wherein the in-situ seismic wave loading device and the monitoring system are in communication connection with the computer.

[0036] The triaxial in-situ static load loading system is used to apply axial pressure and confining pressure to the coal rock sample to be tested, so that the sample is in a specific engineering buried depth stress state; wherein the specific engineering buried depth stress state refers to the stress state of the sample being the same as the stress state of the real rock mass at the depth of the specific engineering, and remaining unchanged;

[0037] The in-situ seismic wave loading device refers to a device that can apply the field-collected rock mass fracture real seismic wave signal to the sample to be tested according to its inherent frequency and amplitude;

[0038] The computer is used to receive the field-collected rock mass fracture real seismic wave signal, and according to the field-collected rock mass fracture real seismic wave signal, control the in-situ seismic wave loading device to apply the same seismic wave as the field-collected rock mass fracture real seismic wave signal to the sample in the specific engineering buried depth stress state;

[0039] The monitoring system is used to monitor the preset type signal of the sample during the entire process from self-loading to fracture; and transmit the monitored preset type signal to the computer; through the computer, the signal monitored by the monitoring system is mined to reveal the damage characteristics of the coal rock sample under the in-situ dynamic and static load conditions.

[0040] Further, the in-situ seismic wave loading device is perpendicular to the static load axial pressure loading axis direction in the triaxial in-situ static load loading system, the in-situ seismic wave loading device and the axial pressure loading axis are not shared, and the seismic wave loading device does not change the axial pressure and confining pressure applied by the triaxial static load device when loading the seismic wave to the sample, and the sample is still in the specific engineering buried depth stress state; so as to ensure that the in-situ seismic wave loading device loads the seismic wave to the sample, and the sample is in the specific engineering buried depth stress state. Wherein, the frequency range of the waveform applied by the in-situ seismic wave loading device is 5Hz-235Hz.

[0041] Further, the computer is built-in with a dynamic load control system, which communicates with the in-situ seismic wave loading device, and can import various types of original seismic waves collected on site, and control the in-situ seismic wave loading device to apply the amplitude-frequency dynamic changing seismic wave signal to the sample according to the original seismic wave collected on site through an internal program; the system can analyze the imported various types of original seismic waves collected on site, and obtain a vibration mode through the calculation of the calculation software, so that the in-situ seismic wave loading device applies the same seismic wave signal to the sample, that is, the original in-situ seismic wave is restored.

[0042] Further, the installation position of the in-situ seismic wave loading device when applying dynamic load to the sample is the periphery of the sample; the dynamic load applying mode is directly acting on the sample itself. Meanwhile, the in-situ seismic wave loading device can freely adjust any part of the sample according to the size and placement position of the sample.

[0043] Further, the monitoring system comprises an acoustic emission sensor, an electromagnetic radiation sensor, a deformation sensor and a high-speed camera. The acoustic emission signal, electromagnetic radiation signal and deformation amount generated by the coal rock mass during the whole loading process can be monitored. The acoustic emission sensor is arranged on the sample and directly contacts the sample, and is used for monitoring the acoustic emission energy and acoustic emission ringing count during the whole process from applying load to the sample to breaking; the electromagnetic radiation sensor is arranged outside the sample and does not directly contact the sample, and is used for monitoring the electromagnetic radiation intensity and electromagnetic radiation energy during the whole process from applying load to the sample to breaking; the deformation sensor and the high-speed camera are built-in in the triaxial in-situ static load loading system, and are used for monitoring the time of deformation of the sample, the displacement deformation size, the displacement deformation rate and the deformation spatial position during the whole process from applying load to the sample to breaking.

[0044] The sensors are connected with a high-speed data acquisition instrument respectively, and the high-speed data acquisition instrument is connected with the computer; further, the computer is also built-in with a data analysis system, which analyzes and processes the data signals collected by the high-speed data acquisition instrument during the whole process from applying load to the sample to breaking, and summarizes the damage characteristics of the coal rock sample, including the spatial damage position of the sample, the time-space damage severity, the damage directionality and the like, so as to reveal the damage characteristics of the coal rock sample under the in-situ dynamic and static load conditions.

[0045] Based on the above, the embodiment also provides a coal rock triaxial in-situ dynamic load damage experiment method realized by using the coal rock triaxial in-situ dynamic load damage experiment system, as shown in Figure 2 The experiment method comprises the following steps:

[0046] S1, the coal rock sample to be tested is placed in a triaxial in-situ static load loading system, and a dynamic load position is designed on the sample to install an in-situ seismic wave loading device, and a sensor position is designed to install a monitoring system;

[0047] S2, the triaxial in-situ static load loading system is used to apply axial pressure and confining pressure to the sample, so that the sample is in a specific engineering buried depth stress state; wherein the specific engineering buried depth stress state refers to that the stress state of the sample is always the same as the stress state of the real rock mass at the depth of the specific engineering, and remains unchanged;

[0048] S3, the real seismic wave signal of rock mass rupture collected on site is input into a computer, and the computer controls the in-situ seismic wave loading device to apply the same seismic wave as the real seismic wave signal of rock mass rupture collected on site to the sample in the specific engineering buried depth stress state, so as to realize dynamic load loading on the sample;

[0049] S4, the preset type signal of the sample during the whole process from self-loading to rupture is monitored by the monitoring system;

[0050] S5, the computer is used to mine the monitored signals to reveal the damage characteristics of the coal rock sample under in-situ dynamic and static load conditions.

[0051] In summary, the embodiment provides a coal rock triaxial in-situ dynamic load damage experiment system and a coal rock triaxial in-situ dynamic load damage experiment method realized by using the same, which are used for evaluating the dynamic load damage of coal rock. The experiment system applies axial pressure and confining pressure to the sample, so that the sample is in a specific engineering buried depth stress state, and the real seismic wave signal of rock mass rupture collected on site is input into a dynamic load control system. The original seismic wave is applied to the sample in the pressure maintaining state by the dynamic load control system to control the seismic wave loading device to perform dynamic load loading. The acoustic-electric-deformation monitoring system monitors the signals during the whole loading process, mines the signals monitored by each system, and reveals the damage characteristics of the coal rock sample under in-situ dynamic and static load conditions. The propagation law of the real seismic wave or the mine seismic vibration wave in the rock mass is explored, the damage characteristics and early warning precursor information of the rock mass under the action of the real seismic wave or the mine seismic vibration wave are revealed, and the coal rock dynamic load damage evaluation is particularly suitable.

[0052] In addition, it should be noted that the present application can be provided as a method, device or computer program product. Therefore, the embodiments of the present application can adopt a completely hardware embodiment, a completely software embodiment or an embodiment combining software and hardware aspects. Moreover, the embodiments of the present application can adopt the form of a computer program product implemented on one or more computer usable storage media containing computer usable program codes.

[0053] The embodiments of the present application are described with reference to the flowchart illustrations and / or block diagrams of the methods, terminal devices (systems) and computer program products according to embodiments of the present application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing terminal devices to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal devices, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0054] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal devices to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0055] It should also be noted that, in the present document, the terms "comprising", "comprising" or any variations thereof are intended to cover non-exclusive inclusions, so that a process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or terminal device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of another identical element in the process, method, article or terminal device including the element.

[0056] Finally, it should be noted that the above description is of preferred embodiments of the application, and that although preferred embodiments of the application have been described, numerous changes and modifications can be made to the preferred embodiments without departing from the principles of the application, and that such changes and modifications are contemplated as falling within the scope of the application. Accordingly, the appended claims are intended to embrace all such changes and modifications.

Claims

1. A coal rock triaxial in-situ dynamic load damage experiment system, characterized in that, The utility model relates to a three -axis in -situ static load loading system, in -situ seismic wave loading device, monitoring system and computer, wherein, The in-situ seismic wave loading device and the monitoring system are in communication connection with the computer; The three -axis in -situ static load loading system is used to apply axial pressure and confining pressure to the coal rock sample to be measured, so that the sample is in a specific engineering buried depth stress state; wherein, the specific engineering buried depth stress state refers to the stress state of the sample is always the same as the stress state of the real rock mass at the depth of the specific engineering, and remains unchanged; The in-situ seismic wave loading device refers to a device that can apply the field-collected rock mass fracture real seismic wave signal to the coal rock sample to be measured according to its inherent frequency and amplitude; The computer is used to receive the field-collected rock mass fracture real seismic wave signal, and according to the field-collected rock mass fracture real seismic wave signal, control the in-situ seismic wave loading device to apply the same seismic wave as the field-collected rock mass fracture real seismic wave signal to the sample in the specific engineering buried depth stress state; The monitoring system is used to monitor the preset type signal of the sample from the self-applied load to the entire process of fracture; and transmit the monitored preset type signal to the computer; the computer mines the signal monitored by the monitoring system to reveal the coal rock sample failure characteristics under in-situ dynamic and static load conditions; The computer has a dynamic load control system built-in, which is used to receive the imported field-collected rock mass fracture real seismic wave signal, and according to the field-collected rock mass fracture real seismic wave signal, realize control of the in-situ seismic wave loading device to apply the amplitude-frequency dynamically changing seismic wave signal to the sample; When controlling the in-situ seismic wave loading device, the dynamic load control system analyzes the imported field-collected rock mass fracture real seismic wave signal, and calculates a vibration mode, which is used to make the seismic wave signal of the in-situ seismic wave loading device acting on the sample the same as the imported field-collected rock mass fracture real seismic wave signal, that is, to restore the in-situ seismic wave. The in-situ seismic wave loading device is perpendicular to the static load axial compression loading axis direction in the three-axis in-situ static load loading system, and the in-situ seismic wave loading device and the axial compression loading axis are not shared, which can ensure that the in-situ seismic wave loading device loads the seismic wave to the sample, and the sample is in the specific engineering buried depth stress state.

2. The coal rock triaxial in-situ dynamic load damage experiment system of claim 1, wherein, The frequency range of the waveform applied by the in-situ seismic wave loading device is 5Hz ~ 235Hz.

3. The coal rock triaxial in-situ dynamic load damage experiment system of claim 1, wherein, The installation position of the in-situ seismic wave loading device when applying dynamic load to the sample is the periphery of the sample; 4. The coal rock triaxial in-situ dynamic load damage experiment system of claim 1, wherein, The in-situ seismic wave loading device applies dynamic load directly to the sample itself. The monitoring system includes an acoustic emission sensor, an electromagnetic radiation sensor, a deformation sensor, and a high-speed camera.

5. The coal rock triaxial in-situ dynamic load damage experiment system of claim 1, wherein, The acoustic emission sensor is arranged on the sample and directly contacts the sample, and is used to monitor the acoustic emission energy and acoustic emission ring count during the entire process from the self-applied load to the fracture of the sample; 6. The coal rock triaxial in-situ dynamic load damage experiment system of claim 5, wherein, The electromagnetic radiation sensor is arranged outside the sample and does not directly contact the sample, and is used to monitor the electromagnetic radiation intensity and electromagnetic radiation energy during the entire process from the self-applied load to the fracture of the sample; ​ The deformation sensor and the high-speed camera are built in the triaxial in-situ static load loading system, and are used for monitoring the time of deformation occurrence, the displacement deformation size, the displacement deformation rate and the deformation spatial position of the sample during the whole process from the sample being loaded to being broken.

7. The coal rock triaxial in-situ dynamic load damage experiment system of claim 1, wherein, The computer is built with a data analysis system, which is used for mining the signals monitored by the monitoring system, and revealing the coal rock sample damage characteristics under in-situ dynamic and static load conditions; wherein the coal rock sample damage characteristics include: sample spatial damage position, time-space damage severity and damage directionality.

8. A coal rock triaxial in-situ dynamic load damage experiment method realized by using the coal rock triaxial in-situ dynamic load damage experiment system according to any one of claims 1-7. The experimental method comprises: placing the coal rock sample to be tested in the triaxial in-situ static load loading system, and designing the dynamic load position on the sample to install the in-situ seismic wave loading device, and then designing the sensor position to install the monitoring system; applying axial pressure and confining pressure to the sample through the triaxial in-situ static load loading system, so that the sample is in a specific engineering buried depth stress state; wherein the specific engineering buried depth stress state refers to the stress state of the sample being the same as the stress state of the real rock mass at the depth of the specific engineering, and being kept unchanged; inputting the collected real seismic wave signal of rock mass breakage into the computer, and controlling the in-situ seismic wave loading device to apply the same seismic wave to the sample in the specific engineering buried depth stress state as the collected real seismic wave signal of rock mass breakage, so as to realize dynamic load loading on the sample according to the collected real seismic wave signal of rock mass breakage through the computer; monitoring the preset type signals of the sample during the whole process from being loaded to being broken through the monitoring system; mining the monitored signals through the computer, and revealing the coal rock sample damage characteristics under in-situ dynamic and static load conditions.

Images