Microseismic rock breakage signal simulation device

Abstract

The application discloses a microseismic rock breaking signal simulation device, which comprises a microseismic signal simulation system and a microseismic monitoring system which are coupled, the microseismic signal simulation system is used to repeatedly generate the same knocking signal, the microseismic signal simulation system comprises PC control software, a knocking circuit control board and a sensor knocking frame, the PC control software is connected with the knocking circuit control board, realizes the issuing of a working instruction, the knocking circuit control board transmits an instruction to the sensor knocking frame, and controls the knocking strength and the knocking frequency of the sensor knocking frame, and the microseismic monitoring system receives the knocking signal generated by the sensor knocking frame and visually displays the same; the application can repeatedly generate the same knocking signal, and can also sequentially generate the signal to simulate the rock breaking signal in an indoor environment for the research and development and maintenance of the microseismic monitoring system.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of geotechnical engineering, and particularly relates to a microseismic rock rupture signal simulation device. BACKGROUND

[0002] Acoustic emission refers to the phenomenon that a research target releases energy in the form of elastic waves to the outside when the research target deforms or breaks under certain external force and internal force. Rock rupture is a kind of acoustic emission, which suddenly and violently releases accumulated strain energy, leading to brittle fracture of the rock mass, and even endangers the safety of the project in a serious case.

[0003] At present, rock mass rupture signal monitoring is one of the most effective early warning methods for such engineering disasters, which mainly realizes early warning of disasters by collecting, processing and analyzing the signals through a microseismic monitoring system, and the early warning accuracy depends on the identification ability of the microseismic monitoring system to the rock rupture signal. At present, in the research and maintenance process of the microseismic monitoring system, most of the simulated rock rupture vibration signals are generated by artificially knocking the floor to generate vibration waves for testing. This method is difficult to control the knocking force and ensure the consistency of the waveform frequency, so that each time the signal is generated, the signal is inconsistent, which is not conducive to the research and maintenance of the microseismic monitoring system. SUMMARY

[0004] In order to solve the above problems, the application provides a microseismic rock rupture signal simulation device, which can repeatedly generate the same knocking signal, so as to better simulate the rock rupture vibration signal in the indoor environment for the research and maintenance of the microseismic monitoring system. The technical scheme is as follows:

[0005] The application provides a microseismic rock rupture signal simulation device, which comprises a microseismic signal simulation system and a microseismic monitoring system which are coupled, the microseismic signal simulation system is used to repeatedly generate the same knocking signal or sequentially knock the simulated rock rupture signal, the microseismic signal simulation system comprises PC control software, a knocking circuit control board and a sensor knocking frame, the PC control software is connected with the knocking circuit control board to realize the issuing of a work instruction, the knocking circuit control board transmits an instruction to the sensor knocking frame and controls the knocking force and the knocking frequency of the sensor knocking frame, and the microseismic monitoring system receives the knocking signal generated by the sensor knocking frame and performs visual display.

[0006] For example, in the microseismic rock rupture signal simulation device provided in an embodiment, the microseismic signal simulation system further comprises a GPS antenna connected with the knocking circuit control board, the GPS antenna is used to send a pulse signal to the knocking circuit control board, realize time correction of the knocking circuit control board, and send the time to the PC control software through Ethernet.

[0007] For example, in an embodiment provided by the microseismic rock fracture signal simulation device, the PC control software transmits operation instructions to the knocking circuit control board through Ethernet, and the knocking circuit control board is connected and controlled by the sensor knocking frame through IIC and IO protocols.

[0008] For example, in an embodiment provided by the microseismic rock fracture signal simulation device, the sensor knocking frame includes a digital potentiometer, a direct current adjustable power supply, a mutual inductor circuit and a solenoid valve connected by a circuit, the knocking circuit control board is connected with the digital potentiometer through the IIC protocol, remote control of the PC control software is realized, the digital potentiometer inputs the analog signal issued by the knocking circuit control board into the direct current adjustable power supply, the direct current adjustable power supply guides the output current into the mutual inductor circuit, the knocking circuit control board transmits the instructions issued by the PC control software to the sensor knocking frame through the IO protocol, so as to control the solenoid valve to knock, the mutual inductor circuit generates a feedback signal when the solenoid valve knocks, and the microseismic monitoring system records the feedback signal and converts it into a numerical signal, so as to realize data intercommunication and correction of the microseismic signal simulation system and the microseismic monitoring system in the process of maintenance and research and development of the microseismic monitoring system.

[0009] For example, in an embodiment provided by the microseismic rock fracture signal simulation device, the microseismic monitoring system includes a microseismic sensor, a microseismic acquisition instrument, a microseismic time server and PC microseismic monitoring software connected with each other, the microseismic sensor is coupled with the sensor knocking frame to receive the vibration generated by the sensor knocking frame at the first time, the sensor knocking frame knocking time and the vibration time when the microseismic sensor is knocked are sent to the PC microseismic monitoring software by the microseismic acquisition instrument, so as to realize time recording in the process of research and development and maintenance of the microseismic monitoring system, and the PC microseismic monitoring software is connected with the microseismic acquisition instrument to realize issuance of operation instructions.

[0010] For example, in an embodiment provided by the microseismic rock fracture signal simulation device, the mutual inductor circuit includes a current mutual inductor, the solenoid valve is arranged adjacent to the current mutual inductor, an acquisition instrument channel connected with the microseismic acquisition instrument is arranged at both ends of the current mutual inductor, the current mutual inductor synchronously generates induced current when the solenoid valve knocks, the microseismic acquisition instrument converts the induced current signal into a digital signal and transmits it to the PC microseismic monitoring software, so as to record the accurate knocking time of the sensor knocking frame.

[0011] For example, in an embodiment provided in the microseismic rock fracture signal simulation device, the GPS antenna is responsible for receiving Beidou satellite time information, and sending an electric frequency time signal to the knocking circuit control board based on the IEEE1588 v2 protocol function, and storing the time information in the time register module in the knocking circuit control board. The PC control software transmits the GPS time information recorded in the knocking circuit control board to the solid state disk of the computer installed with the PC control software through the IEEE1588 v2 protocol, and displays the time of the GPS through software.

[0012] For example, in an embodiment provided in the microseismic rock fracture signal simulation device, the microseismic monitoring system includes a plurality of microseismic acquisition instruments, each of which is connected to a plurality of microseismic sensors, and the microseismic signal simulation system includes a plurality of sensor knocking frames connected to the knocking circuit control board. Each of the microseismic sensors is connected to the sensor knocking frame one by one, and the PC control software controls a plurality of the sensor knocking frames to knock simultaneously or sequentially, or the PC control software controls each of the sensor knocking frames to knock at a certain time interval.

[0013] For example, in an embodiment provided in the microseismic rock fracture signal simulation device, the microseismic time server is connected to each of the microseismic acquisition instruments and synchronously time-grants each of the microseismic acquisition instruments, so that the knocking time recorded by each of the microseismic acquisition instruments has uniformity.

[0014] For example, in an embodiment provided in the microseismic rock fracture signal simulation device, after the microseismic time server time-grants each of the microseismic acquisition instruments, when the microseismic acquisition instrument receives the induced current of the current transformer, it transmits the value of the induced current and the time information recorded by the time register of the microseismic acquisition instrument to the PC microseismic monitoring software through the data network cable. The PC microseismic monitoring software has a visualization function, and the knocking time and number of the sensor knocking frame are recorded through the PC microseismic monitoring software.

[0015] The microseismic rock fracture signal simulation device provided by some embodiments of the present application has the beneficial effects that: the present application can repeatedly generate the same knocking signal, and can also generate signals sequentially to simulate rock fracture signals in an indoor environment for the research and maintenance of the microseismic monitoring system, and on this basis, a time recording system is added to calculate the time error of each microseismic acquisition instrument, so that the rock fracture vibration signal in the indoor environment can be better simulated for the research and maintenance of the microseismic monitoring system. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and other drawings can be obtained by those of ordinary skill in the art without any creative effort based on these drawings.

[0017] Figure 1 The schematic diagram of the microseismic rock fracture signal simulation device of the present application;

[0018] Figure 2 The schematic diagram of the system connection for the development and maintenance process of the sensor knocking frame applied to microseismic monitoring;

[0019] Figure 3 The schematic diagram of the current mutual inductance of the sensor knocking frame. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments only represent some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the scope of the present application.

[0021] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood as the general meaning understood by those skilled in the art to which the present disclosure belongs. The terms "first", "second", and similar terms used in the present disclosure do not represent any order, number, or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, without excluding other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right", and the like only represent relative positional relationships, which can change accordingly when the absolute position of the described object changes.

[0022] The present application provides a microseismic rock fracture signal simulation device, which comprises a microseismic signal simulation system and a microseismic monitoring system coupled and connected. The microseismic signal simulation system is used to repeatedly generate the same knocking signal or sequentially knock the simulated rock fracture signal.

[0023] As Figure 1As shown, the microseismic signal simulation system comprises PC control software, a GPS antenna, a knocking circuit control board and a sensor knocking frame, the PC control software is connected to the knocking circuit control board through Ethernet to realize the issuing of working instructions; the GPS antenna is directly connected to the knocking circuit control board to send a pulse signal to the knocking circuit control board, realize the time correction of the knocking circuit control board, and send the time to the PC control software through Ethernet; the knocking circuit control board transmits the instructions issued by the PC control software to the sensor knocking frame through a transmission protocol and a cable, so as to control the knocking strength and frequency of the sensor knocking frame, and the microseismic monitoring system receives the knocking signal generated by the sensor knocking frame and performs visual display.

[0024] Specifically, the GPS antenna is responsible for receiving Beidou satellite time information, and sending an electric frequency time signal to the knocking circuit control board based on the IEEE1588 v2 protocol function, storing the time information in the time register module in the knocking circuit control board, and transmitting the GPS time information recorded in the knocking circuit control board to the solid state disk of the computer installed with the PC control software through the IEEE1588 v2 protocol, that is, the time of GPS can be displayed through software.

[0025] The knocking circuit control board is connected and controlled with the sensor knocking frame through IIC (Inter-Integrated Circuit) and IO protocols, the IIC protocol contains a clock information line and a data transmission line, which can greatly reduce the occupation of hardware resources and space, thereby increasing the stability of the system.

[0026] As Figure 1As shown, the sensor knocking frame includes a digital potentiometer, a direct current adjustable power supply, a mutual inductor circuit and a solenoid valve connected by a circuit. The knocking circuit control board is connected with the digital potentiometer through an IIC protocol, so as to realize remote control of the PC control software. The digital potentiometer is a new type of CMOS digital and analog hybrid signal processing integrated circuit which replaces the traditional mechanical potentiometer (analog potentiometer). The digital potentiometer can input an analog signal sent by the knocking circuit control board according to a switch trimming and zooming, and input the signal into the direct current adjustable power supply. The direct current adjustable power supply is an electronic instrument device which converts power frequency grid power into a special form of high voltage power supply, and can form stable and controllable direct current. The mutual inductor circuit detects current through an inductive switch, records output voltage and acquires feedback voltage time stamp at the same time, and transmits the time stamp signal to the knocking circuit control board. The knocking circuit control board transmits an instruction sent by the PC control software to the sensor knocking frame through an IO protocol, so as to control the solenoid valve to knock, and control the strength and frequency of the knocking. The greater the input voltage is, the greater the strength of the knocking is. The higher the input current frequency is, the faster the frequency of the knocking is. The mutual inductor circuit generates a feedback signal when the solenoid valve knocks. The microseismic monitoring system records the feedback signal and converts it into a numerical signal, so as to realize data intercommunication and correction of the microseismic signal simulation system and the microseismic monitoring system in the maintenance and research and development process of the microseismic monitoring system.

[0027] As shown in Figure 2 The microseismic monitoring system includes a microseismic sensor, a microseismic acquisition instrument, a microseismic time server and a PC microseismic monitoring software connected with each other. The top of the sensor knocking frame is tightly coupled with the bottom of the microseismic sensor through a bolt, so that the microseismic sensor can receive the vibration generated by the sensor knocking frame in the first time. The microseismic acquisition instrument sends the knocking time of the sensor knocking frame and the vibration time when the microseismic sensor is knocked to the PC microseismic monitoring software, so as to realize time recording in the research and development and maintenance process of the microseismic monitoring system. The PC microseismic monitoring software is connected with the microseismic acquisition instrument through a data network cable, so as to realize sending of an operation instruction. Meanwhile, the microseismic acquisition instrument also transmits recorded data to the PC microseismic monitoring software.

[0028] For example, in the microseismic rock breaking signal simulation device provided in an embodiment, as shown in Figure 2As shown in the figure, the microseismic monitoring system comprises a plurality of microseismic acquisition instruments, each of which is connected to a plurality of microseismic sensors, the microseismic signal simulation system comprises a plurality of sensor knocking frames connected to the knocking circuit control board, each of the microseismic sensors is connected to the sensor knocking frame one by one, and the PC control software controls a plurality of the sensor knocking frames to knock at the same time or in sequence, or the PC control software controls each of the sensor knocking frames to knock at a certain time interval.

[0029] As shown in the figure, Figure 3 The transformer circuit comprises a current transformer, the electromagnetic valve is arranged adjacent to the current transformer, an acquisition instrument channel connected to the microseismic acquisition instrument is arranged at both ends of the current transformer, the current transformer generates an induced current synchronously when the electromagnetic valve knocks, the microseismic acquisition instrument converts the induced current signal into a digital signal and transmits it to the PC microseismic monitoring software, so as to record the accurate knocking time of the sensor knocking frame.

[0030] Specifically, as shown in the figure, Figure 3 The transformer circuit is composed of a current transformer, a No. 1 battery, a 2M resistor, an S-POW power supply, an acquisition instrument channel 1, an acquisition instrument channel 2 and an electromagnetic valve, and the S-POW is responsible for controlling the voltage amplitude and the frequency of the current passing through the transformer circuit, so as to determine the amplitude and frequency of the vibration of the sensor knocking frame.

[0031] The knocking circuit control board transmits the instructions issued by the PC control software to the sensor knocking frame through the IO protocol, so as to control the electromagnetic valve in the sensor knocking frame to knock. The PC control software can control multiple sensor knocking frames to knock at the same time or in sequence through the "event" mode, or control a single sensor knocking frame to knock through the "sensor" mode.

[0032] Specifically, the sensor knocking frame can be single-knocking, multiple-knocking at the same time or in sequence. A weak induced current is generated in the current transformer each time the sensor knocking frame knocks. The current can be connected to the microseismic acquisition instrument through the acquisition instrument channel cable, and then the current signal is converted into a digital signal by the microseismic acquisition instrument, so that the data intercommunication and correction of the two can be realized in the maintenance and research and development process of the microseismic monitoring system. The digital signal is transmitted to the PC microseismic monitoring software through the data network cable, so as to record the accurate knocking time of the sensor knocking frame.

[0033] In order to make the knocking time recorded by multiple microseismic acquisition instruments uniform, thereby reducing the error of the knocking record time in the maintenance and research and development process of multiple microseismic acquisition instruments, for example, in the microseismic rock rupture signal simulation device provided in an embodiment, as shown in the figure, Figure 2The microseismic time server is connected with each microseismic acquisition instrument and performs time synchronization and time service for each microseismic acquisition instrument, so that the knocking time recorded by each microseismic acquisition instrument has uniformity.

[0034] The microseismic time server sends time synchronization signals to each microseismic acquisition instrument through a network switch according to the communication protocol of the IEEE1588 v2 standard and the number of terminal microseismic data acquisition clocks, and the specific time service process is as follows:

[0035] The time record of the time service device # receiving the Sync packet is T2. The time service device # sends a Dealy_Req packet to the microseismic time server at T3. The microseismic time server receives the Dealy_Req packet and records the receiving time T4. The microseismic time server sends a Dealy_Resq packet carrying the T4 timestamp information to the time service device 1#. After the master-slave packet interaction is completed in a period, the time service device 1# calculates the time difference Offest and the path delay Delay according to the four timestamp information T1, T2, T3 and T4.

[0036] Offest = ((T4-T3)-(T2-T1)) / 2 and Delay = ((T4-T3)+(T2-T1)) / 2. The time difference Offest and the path delay Delay can effectively eliminate the time synchronization error and time service delay of multiple microseismic acquisition instruments. The device adopts a high-precision constant-temperature crystal, which can ensure that the synchronization accuracy of the local time with the GPS / Beidou time service clock is within 100ns, thereby realizing high-precision time synchronization.

[0037] After the microseismic time server performs time service for each microseismic acquisition instrument, each microseismic acquisition instrument has a built-in time. When the microseismic acquisition instrument receives the induced current of the current transformer, the induced current value and the time information recorded by the time register of the microseismic acquisition instrument are transmitted to the PC microseismic monitoring software through a data network cable. The PC microseismic monitoring software has a visualization function, and users can select an event mode to realize simultaneous knocking of multiple sensor knocking frames or sequential knocking, or select a sensor mode to realize knocking of a single sensor knocking frame. The PC microseismic monitoring software records the knocking time and number of the knocking frame, and the rock fracture signal simulated by the sensor knocking frame can be visually displayed through the visualization function of the PC microseismic monitoring software.

[0038] The microseismic rock rupture signal simulation device can simulate a real microseismic rock rupture signal. The simulation steps of the rock rupture signal are as follows: the microseismic signal simulation system first performs GPS positioning, sets two output control ends, selects a sensor mode, and sets a knocking time interval of each sensor knocking frame; then the microseismic signal simulation system controls the knocking frame to knock according to the set time interval, outputs control 2 paths, the current path, and the bus conduction, at this time the current flows, the transformer circuit is connected, the current transformer generates an induced current signal, the microseismic acquisition instrument collects this signal through the acquisition instrument channel, and records the time stamp at this time. Randomly test multiple groups of data, compare the data, compare the time stamp recorded by the device with the time stamp recorded by multiple microseismic acquisition instruments, and analyze the time error of the multiple microseismic acquisition instruments.

[0039] In summary, the microseismic rock rupture signal simulation device of the present application can repeatedly generate the same knocking signal, and can also sequentially generate the signal to simulate the rock rupture signal in the indoor environment for the research and maintenance of the microseismic monitoring system. On this basis, a time recording system is added to calculate the time error of each microseismic acquisition instrument, so that the rock rupture vibration signal can be better simulated in the indoor environment for the research and maintenance of the microseismic monitoring system.

[0040] Although the embodiments of the present application have been disclosed as above, they are not limited to the application listed in the specification and embodiments, and can be fully applied to various fields suitable for the present application. Those skilled in the art can easily make other modifications, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A microseismic rock fracture signal simulation device, characterized in that, The system includes a coupled microseismic signal simulation system and a microseismic monitoring system. The microseismic signal simulation system is used to repeatedly generate the same impact signal or sequentially impact to simulate rock fracturing signals. The microseismic signal simulation system includes PC control software, an impact circuit control board, and a sensor impact frame. The PC control software is connected to the impact circuit control board to issue working instructions. The impact circuit control board transmits instructions to the sensor impact frame and controls the impact force and frequency of the sensor impact frame. The microseismic monitoring system receives the impact signals generated by the sensor impact frame and displays them visually. The sensor impact frame includes a digital potentiometer, a DC adjustable power supply, a current transformer circuit, and a solenoid valve connected by a circuit. The impact circuit control board is connected to the digital potentiometer via the IIC protocol to enable remote control by the PC control software. The digital potentiometer inputs the analog signal sent by the impact circuit control board to the DC adjustable power supply. The DC adjustable power supply outputs current into the current transformer circuit. The current transformer circuit detects the current through an inductive switch and simultaneously records the timestamps of the output voltage and the collected feedback voltage, transmitting the timestamp signals to the impact circuit control board. The impact circuit control board transmits the instructions issued by the PC control software to the sensor impact frame via the I / O protocol, thereby controlling the solenoid valve to impact. The current transformer circuit generates a feedback signal when the solenoid valve impacts. The micro-vibration monitoring system records this feedback signal and converts it into a numerical signal to achieve data interoperability and correction between the micro-vibration signal simulation system and the micro-vibration monitoring system during the maintenance and development of the micro-vibration monitoring system. The microseismic monitoring system includes interconnected microseismic sensors, a microseismic acquisition device, a microseismic timing server, and PC-based microseismic monitoring software. The microseismic sensors are coupled to the sensor impact frame to receive the vibrations generated by the sensor impact frame in real time. The microseismic acquisition device sends the impact time of the sensor impact frame and the vibration time of the microseismic sensor when it is impacted to the PC-based microseismic monitoring software, thereby realizing time recording during the research and development and maintenance of the microseismic monitoring system. The PC-based microseismic monitoring software is connected to the microseismic acquisition device to issue operation commands. The transformer circuit includes a current transformer, and the solenoid valve is arranged adjacent to the current transformer. The current transformer has acquisition channels at both ends that are connected to the micro-vibration acquisition instrument. When the solenoid valve is struck, the current transformer synchronously generates an induced current. The micro-vibration acquisition instrument converts the induced current signal into a digital signal and transmits it to the PC micro-vibration monitoring software, thereby recording the accurate striking time of the sensor striking frame. The microseismic monitoring system includes several microseismic acquisition units, each of which is connected to several microseismic sensors. The microseismic signal simulation system includes several sensor tapping frames connected to the tapping circuit control board. Each microseismic sensor is connected to a sensor tapping frame in a one-to-one correspondence. The PC control software controls multiple sensor tapping frames to tap simultaneously or sequentially, or the PC control software controls each sensor tapping frame to tap at a certain time interval. The microseismic timing server is connected to each of the microseismic acquisition instruments and performs time synchronization for each of the microseismic acquisition instruments so that the impact time recorded by each of the microseismic acquisition instruments is uniform. When the current transformer generates an induced current signal, the microseismic acquisition instrument acquires the signal through the acquisition instrument channel and records the timestamp at this time. The timestamp recorded by this device is compared and analyzed with the timestamps recorded by multiple microseismic acquisition instruments to determine the timing error of the multiple microseismic acquisition instruments.

2. The microseismic rock fracture signal simulation device according to claim 1, characterized in that, The micro-vibration signal simulation system also includes a GPS antenna connected to the impact circuit control board. The GPS antenna is used to send pulse signals to the impact circuit control board to realize time correction of the impact circuit control board and send the time to the PC control software via Ethernet.

3. The microseismic rock fracture signal simulation device according to claim 2, characterized in that, The PC control software transmits operation commands to the striking circuit control board via Ethernet. The striking circuit control board connects to and controls the sensor striking frame via IIC and IO protocols.

4. The microseismic rock fracture signal simulation device according to claim 2, characterized in that, The GPS antenna is responsible for receiving BeiDou satellite time information and sending electrical frequency time signals to the tapping circuit control board based on the IEEE1588 v2 protocol. The time information is stored in the time register module in the tapping circuit control board. The PC control software transmits the GPS time information recorded on the tapping circuit control board to the solid-state hard drive of the computer with the PC control software installed through the IEEE1588 v2 protocol, and displays the GPS time through the software.

5. The microseismic rock fracture signal simulation device according to claim 4, characterized in that, After the microseismic timing server synchronizes the time of each of the microseismic acquisition instruments, when the microseismic acquisition instrument receives the induced current from the current transformer, it transmits the magnitude of the induced current and the time information recorded by the time register of the microseismic acquisition instrument to the PC microseismic monitoring software through the data network cable. The PC microseismic monitoring software has a visualization function and records the tapping time and number of the sensor tapping frame through the PC microseismic monitoring software.

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