CN111897009A - Microseismic monitoring system and application method thereof - Google Patents
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Abstract
The invention provides a microseismic monitoring system and an application method thereof, the system comprises an aboveground microseismic monitoring system and an underground microseismic monitoring system, the underground microseismic monitoring system comprises a plurality of microseismic signal acquisition units, the aboveground microseismic monitoring system comprises a microseismic signal acquisition station, a microseismic signal recording and storing instrument and a PC (personal computer) terminal, the microseismic signal acquisition station respectively provides working power supply for each microseismic signal acquisition unit through a mine communication cable, the microseismic signal acquisition station is used for acquiring microseismic signals detected by each microseismic signal acquisition unit, and the microseismic signal recording and storing instrument is connected with the PC terminal and is used for acquiring and recording microseismic data acquired from the microseismic signal acquisition station. The invention can realize the remote real-time and dynamic monitoring of the microseism event in the monitoring area, automatically record and store the monitoring data when the transmission fails, provide safe and reliable data for the safety production of the coal mine, further reduce the loss caused by the microseism of the coal mine, and has the characteristics of flexibility, reliability, good monitoring effect, low cost and the like.
Description
Technical Field
The invention relates to the technical field of microseismic monitoring, in particular to a microseismic monitoring system and an application method applied to the system.
Background
Mine earthquake is a mine earthquake induced by mining and is a natural disaster of a mine, when the mine earthquake occurs, surrounding rocks quickly release energy, coal rocks are instantaneously and suddenly damaged, and strong impact airflow can be formed to cause disasters such as roof caving, support breakage, roadway blockage, ground vibration, house damage, personal injury and the like. When the stress borne by the rock material gradually exceeds the bearing strength of the rock or the material, the rock material is heterogeneous, the rock material is subjected to weak surface and flaw, the weak surface and flaw are firstly damaged, and simultaneously microseismic signals are generated. The microseismic signal generated at this time is thousands of times greater than that normally generated. When the stress borne by the rock material obviously exceeds the bearing strength of the rock or the material, the material starts to be obviously damaged, and simultaneously generates a micro-seismic signal with large energy, and along with the occurrence of the falling or collapsing accident, the micro-seismic signal with large energy continuously occurs along with the falling or collapsing process until the falling or collapsing accident is finished.
At present, the technology for predicting and controlling the mine earthquake is researched at home and abroad, and although the mechanism of the mine earthquake is known and some preventive measures are provided, the problem is not solved well all the time. At present, most of researches are specially carried out on a certain phenomenon of mine earthquake. Most of mines in China are built in the fifties and sixties, at present, the mines are about to enter deep mining, mine earthquake disasters become more and more serious, and the mine earthquake of coal mines tends to further rise, so that the safety production of the coal mines is seriously influenced. The real-time monitoring equipment for mine earthquake disasters, particularly coal mine micro-earthquakes, cannot automatically record and store monitoring data when the monitoring data are transmitted and send the monitoring data in real time, cannot monitor the monitoring data flexibly and reliably, and cannot avoid accidents.
Disclosure of Invention
The invention mainly aims to provide a microseismic monitoring system which can realize remote real-time and dynamic monitoring of microseismic events in a monitoring area, automatically record and store monitoring data when transmission fails, has the characteristics of flexibility, reliability, good monitoring effect and low cost, provides safe and reliable data for the safety production of coal mines and reduces the loss caused by microseismic events of the coal mines.
The invention also aims to provide an application method of the microseismic monitoring system, which can realize the remote real-time and dynamic monitoring of microseismic events in a monitoring area, automatically record and store the monitoring data when the transmission fails, has the characteristics of flexibility, reliability, good monitoring effect and low cost, provides safe and reliable data for the safety production of coal mines and reduces the loss caused by the microseismic events of the coal mines.
In order to achieve the main purpose, the invention provides a microseismic monitoring system, which comprises an aboveground microseismic monitoring system and an underground microseismic monitoring system, wherein the underground microseismic monitoring system comprises a plurality of microseismic signal acquisition units arranged underground, and the aboveground microseismic monitoring system comprises a microseismic signal acquisition station, a microseismic signal recording and storing instrument and a PC (personal computer) end which are arranged aboveground; the microseismic signal acquisition station is used for acquiring microseismic signals detected by the microseismic signal acquisition units, and the microseismic signal recording and storing instrument is connected with the PC end through a local area network and is used for acquiring and recording microseismic data acquired from the microseismic signal acquisition station.
In a further scheme, the microseismic signal acquisition unit comprises a microseismic sensor and transmits the detected microseismic signal to the microseismic signal acquisition station.
In a further scheme, the microseismic signal acquisition unit comprises a microseismic sensor, a signal conditioning circuit, a microprocessor and an Ethernet communication module, wherein the microseismic sensor outputs a detected microseismic signal to the microprocessor through the signal conditioning circuit, and the microprocessor establishes communication with the PC terminal through the Ethernet communication module.
In a further scheme, the signal conditioning circuit comprises an amplifying circuit, a filtering circuit and an a/D conversion module, the amplifying circuit is connected with the vibration pickup sensor, the amplifying circuit is connected with the filtering circuit, and the filtering circuit is connected with the a/D conversion module.
In a further scheme, the seismic pick-up sensors are DLM2001 seismic pick-up sensors, and each DLM2001 seismic pick-up sensor is connected to the microseismic signal acquisition station through lightning protection equipment.
In a further scheme, the microseismic signal recording and storing instrument is an AS-1 signal recording and storing instrument, and the AS-1 signal recording and storing instrument is designed based on an IBM PC computer with a 32-channel A/D conversion card embedded therein and is used for converting microseismic signals acquired from the microseismic signal acquisition station into digital signals.
In a further scheme, the microseismic signal acquisition station is a DLM-SO signal acquisition station, and is used for acquiring microseismic signals transmitted by the seismic pick-up sensor and supplying power to the seismic pick-up sensor.
In a further scheme, the amplifying circuit comprises an operational amplifier chip IC1 and an operational amplifier chip IC2, wherein a positive power supply terminal of the operational amplifier chip IC1 is connected with one end of a capacitor C2 and a +5V voltage input end, the other end of the capacitor C2 is grounded, a negative power supply terminal of the operational amplifier chip IC1 is connected with one end of a capacitor C3 and the-5V voltage input end, and the other end of the capacitor C3 is grounded; the output of chip IC1 is put to fortune is connected with the other end of resistance R2, the other end of electric capacity C1, the one end of resistance R3 respectively, the other end of resistance R3 is connected with the one end of electric capacity C4, the one end of resistance R4, the inverting input of chip IC2 is put to fortune respectively, electric capacity C4's other end ground connection, the other end of resistance R4 is connected with the output of chip IC2, the one end of resistance R6 is put to fortune respectively, the other end of resistance R6 with filter circuit's input is connected, ground connection behind the homophase input series connection resistance R5 of chip IC1 is put to fortune.
In a further scheme, the filter circuit comprises an operational amplifier chip IC21, an operational amplifier chip IC22 and an operational amplifier chip IC23, wherein an inverting input terminal of the operational amplifier chip IC21 is connected with one end of a resistor R22, one end of a capacitor C22, one end of a resistor R23, one end of a capacitor C23, one end of a capacitor C24 and one end of an adjustable resistor RP21, the other end of the resistor R22 is connected with one end of a resistor R21 and one end of a capacitor C26, the other end of the capacitor C26 is grounded, the other end of the resistor R21 is connected with one end of a capacitor C21 and an input terminal of the filter circuit, and the other end of the capacitor C21 is connected with the other end of the capacitor C22; the other end of the resistor R23 is respectively connected with the other end of the capacitor C23, one end of the resistor R24 and the output end of the operational amplifier chip IC 21; the other end of the capacitor C24 is respectively connected with the other end of the adjustable resistor RP21, one end of the capacitor C25 and the output end of the operational amplifier chip IC22, the other end of the capacitor C25 is respectively connected with one end of the adjustable resistor RP22 and the inverting input end of the operational amplifier chip IC22, and the non-inverting input end of the operational amplifier chip IC22 is grounded; the other end of the capacitor C23 is connected with the other end of the resistor R23, one end of the resistor R24 and the output end of the operational amplifier chip IC22, the other end of the resistor R24 is connected with one end of the resistor R25 and the reverse-phase input end of the operational amplifier chip IC22, the non-inverting input end of the operational amplifier chip IC23 is grounded, and the other end of the resistor R25 is connected with the other end of the adjustable resistor RP22 and the output end of the filter circuit.
In order to achieve the above another object, the present invention provides an application method of a microseismic monitoring system, wherein the microseismic monitoring system adopts the above microseismic monitoring system, and the method includes the following steps: installing a micro-seismic signal acquisition unit in a to-be-detected area of a coal mine field, inputting a three-dimensional coordinate provided with the micro-seismic signal acquisition unit into a system, marking a recorded data P wave, and obtaining the three-dimensional coordinate and the energy of a mine seismic event through system operation; connecting each group of underground microseismic signal acquisition units by cables respectively, and then connecting the units with microseismic signal acquisition stations arranged on the well to form a complete monitoring network; the microseismic signal is acquired by a microseismic sensor and transmitted to a microseismic signal acquisition station on the ground through an industrial Ethernet ring network, the microseismic signal acquisition station transmits the monitored data to a microseismic signal recording and storing instrument in real time for filtering, microseismic event judgment, microseismic event positioning and seismic source parameter determination, and a database of a microseismic monitoring system is called for data conversion and analysis to generate a mine earthquake monitoring early warning report form, a curve graph, a column graph and the like.
Therefore, the ground is additionally provided with the aboveground micro-seismic monitoring system, so that the whole underground including the monitoring area is subjected to three-dimensional monitoring, the monitoring precision of underground micro-seismic events in the vertical direction can be obviously improved, the vibration speed type mine seismic measuring probe with the embedded signal transmission module is adopted, the independent trunk line type data transmission system is adopted for bidirectional control transmission, and the remote monitoring and debugging of the working state of the measuring probe can be realized; the anti-interference performance is strong, the operation is stable and reliable, automatic filtering can be realized, interference signals are filtered and denoised, effective signals are automatically screened out, digital collection, transmission and arrangement of monitoring data can be realized, and the monitoring data are accurate.
The regional monitoring method has wide monitoring range, can realize all-around and multi-layer continuous monitoring in the whole well field range, and has high positioning precision and small error. Through the analysis of the complete waveform of the mine earthquake signal, the earthquake type, the occurrence force source and the energy of every earthquake are determined, the mine impact mine pressure danger degree is evaluated, the mine impact mine pressure disaster loss of a coal mine can be greatly reduced, and huge economic benefits and social benefits are generated.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a microseismic monitoring system of the present invention.
FIG. 2 is a schematic diagram of an embodiment of a microseismic monitoring system of the present invention.
FIG. 3 is a schematic circuit diagram of an amplifying circuit in an embodiment of a microseismic monitoring system of the present invention.
FIG. 4 is a schematic circuit diagram of a filter circuit in an embodiment of a microseismic monitoring system of the present invention.
FIG. 5 is a schematic diagram of a mine seismic location of an embodiment of a microseismic monitoring system of the present invention.
FIG. 6 is a schematic diagram of a downhole seismic pick-up sensor arrangement in an embodiment of a microseismic monitoring system of the present invention.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
An embodiment of a microseismic monitoring system:
referring to fig. 1 and 2, the microseismic monitoring system of the present invention comprises an aboveground microseismic monitoring system and an underground microseismic monitoring system, wherein the underground microseismic monitoring system comprises a plurality of microseismic signal acquisition units 10 arranged underground, and the aboveground microseismic monitoring system comprises a microseismic signal acquisition station 21 arranged aboveground, a microseismic signal recording and storing instrument 22 and a PC end 31.
In this embodiment, the microseismic signal acquisition units 10 are connected to the microseismic signal acquisition station 21 through a mine communication cable, the microseismic signal acquisition station 21 provides a working power supply to each microseismic signal acquisition unit 10 through the mine communication cable, the microseismic signal acquisition station 21 is configured to acquire microseismic signals detected by each microseismic signal acquisition unit 10, and the microseismic signal recording and storing instrument 22 is connected to the PC terminal 31 through a local area network and is configured to acquire and record microseismic data acquired from the microseismic signal acquisition station 21. In this embodiment, the microseismic monitoring system further comprises an analysis system 30 and a USP power module 40, wherein the analysis system 30 comprises a PC terminal 31 and a printer 32 connected thereto, the microseismic signal acquisition station 21 and the microseismic signal recording and storing instrument 22 form a microseismic monitoring system machine room 20, and the USP power module 40 provides working power to the analysis system 30 and the microseismic monitoring system machine room 20.
In this embodiment, the microseismic signal acquisition unit 10 includes a pick-up transducer 11 and transmits the detected microseismic signals to a microseismic signal acquisition station 21.
The seismic sensors 11 are DLM2001 seismic sensors, and each DLM2001 seismic sensor is connected to the microseismic signal acquisition station 21 through lightning protection equipment. Preferably, the lightning protection device of the present embodiment is a lightning protection grid.
The microseismic signal recording and storing instrument 22 is an AS-1 signal recording and storing instrument, and the AS-1 signal recording and storing instrument is designed based on an IBM PC computer with a 32-channel A/D conversion card embedded therein and is used for converting microseismic signals acquired from the microseismic signal acquisition station 21 into digital signals.
The microseismic signal acquisition station 21 is a DLM-SO signal acquisition station, is used for acquiring microseismic signals transmitted by the seismic pickup sensors 11 and supplying power to the seismic pickup sensors 11, and comprises a plurality of microseismic data acquisition units.
It can be seen that the microseismic signals detected by the seismic sensor 11 of the present embodiment can be directly collected by the microseismic signal collection station 21, and collected and recorded by the microseismic signal recording and storing instrument 22 and the PC terminal 31 from the microseismic signal collection station 21. When the micro-seismic signal acquisition station is used, the sensor directly outputs digital signals to be transmitted to the micro-seismic signal acquisition station 21 for processing, and the micro-seismic signal acquisition station 21 collects signals of all paths and then transmits the signals to the host.
The microseismic signal acquisition unit 10 of the embodiment may further include a seismic sensor 11, a signal conditioning circuit 12, a microprocessor 13, and an ethernet communication module 14, wherein the seismic sensor 11 outputs the detected microseismic signal to the microprocessor 13 through the signal conditioning circuit 12, and the microprocessor 13 establishes communication with the PC terminal 31 through the ethernet communication module 14.
The signal conditioning circuit 12 comprises an amplifying circuit, a filter circuit and an A/D conversion module, wherein the amplifying circuit is connected with the vibration pickup sensor 11, the amplifying circuit is connected with the filter circuit, and the filter circuit is connected with the A/D conversion module.
Referring to fig. 3, the amplifying circuit includes an operational amplifier chip IC1 and an operational amplifier chip IC2, a positive power supply terminal of the operational amplifier chip IC1 is connected to one terminal of a capacitor C2 and a +5V voltage input terminal, the other terminal of the capacitor C2 is grounded, a negative power supply terminal of the operational amplifier chip IC1 is connected to one terminal of a capacitor C3 and the-5V voltage input terminal, and the other terminal of the capacitor C3 is grounded; the output end of the operational amplifier chip IC1 is connected with the other end of the resistor R2, the other end of the capacitor C1 and one end of the resistor R3, the other end of the resistor R3 is connected with one end of the capacitor C4, one end of the resistor R4 and the inverting input end of the operational amplifier chip IC2, the other end of the capacitor C4 is grounded, the other end of the resistor R4 is connected with the output end of the operational amplifier chip IC2 and one end of the resistor R6, the other end of the resistor R6 is connected with the input end of the filter circuit, and the non-inverting input end of the operational amplifier chip IC1 is grounded after being connected with the resistor R5 in series.
Referring to fig. 4, the filter circuit includes an operational amplifier chip IC21, an operational amplifier chip IC22, and an operational amplifier chip IC23, an inverting input terminal of the operational amplifier chip IC21 is connected to one end of a resistor R22, one end of a capacitor C22, one end of a resistor R23, one end of a capacitor C23, one end of a capacitor C24, and one end of an adjustable resistor RP21, the other end of the resistor R22 is connected to one end of a resistor R21 and one end of the capacitor C26, the other end of the capacitor C26 is grounded, the other end of the resistor R21 is connected to one end of a capacitor C21 and an input terminal of the filter circuit, and the other end of the capacitor C21 is connected to the other end of the capacitor C22; the other end of the resistor R23 is respectively connected with the other end of the capacitor C23, one end of the resistor R24 and the output end of the operational amplifier chip IC 21; the other end of the capacitor C24 is respectively connected with the other end of the adjustable resistor RP21, one end of the capacitor C25 and the output end of the operational amplifier chip IC22, the other end of the capacitor C25 is respectively connected with one end of the adjustable resistor RP22 and the inverting input end of the operational amplifier chip IC22, and the non-inverting input end of the operational amplifier chip IC22 is grounded; the other end of the capacitor C23 is connected with the other end of the resistor R23, one end of the resistor R24 and the output end of the operational amplifier chip IC22, the other end of the resistor R24 is connected with one end of the resistor R25 and the inverting input end of the operational amplifier chip IC22, the non-inverting input end of the operational amplifier chip IC23 is grounded, and the other end of the resistor R25 is connected with the other end of the adjustable resistor RP22 and the output end of the filter circuit.
It can be seen that, in this embodiment, the microseismic signals can be collected by the seismic pickup sensor 11, the microseismic signals are amplified and filtered by the amplifying circuit and the filtering circuit, then are subjected to a/D conversion by the a/D conversion module to obtain digital signals, and the digital signals are finally transmitted to the PC terminal 31 through the microprocessor 13 via the ethernet, and the PC terminal 31 collects and processes the digital signals, so that the wireless collection of the microseismic signals is realized, the signal collection can be performed by the above method under the condition of cable damage, and then, the early warning is performed on accidents or natural disasters, and the loss caused by the disasters is reduced to the maximum extent.
The embodiment of an application method of a microseismic monitoring system comprises the following steps:
an application method of a microseismic monitoring system is applied to the microseismic monitoring system, and the method comprises the following steps: installing a micro-seismic signal acquisition unit 10 in a to-be-detected area of a coal mine field, inputting a three-dimensional coordinate provided with the micro-seismic signal acquisition unit 10 into a system, marking recorded data P waves, and obtaining the three-dimensional coordinate and energy of a mine seismic event through system operation; connecting each group of underground microseismic signal acquisition units 10 by cables respectively, and then connecting the units with a microseismic signal acquisition station 21 arranged on the well to form a complete monitoring network; the microseismic signals are acquired by the microseismic sensor 11 and transmitted to the microseismic signal acquisition station 21 on the ground through the industrial Ethernet ring network, the microseismic signal acquisition station 21 transmits the monitored data to the microseismic signal recording and storing instrument 22 in real time for filtering, microseismic event judgment, microseismic event positioning and seismic source parameter determination, and the database of the microseismic monitoring system is called for data conversion and analysis to generate a mine earthquake monitoring early warning report form, a curve graph, a histogram and the like.
The software of the microseismic monitoring system of the embodiment consists of SEISGRAM and MULTILOK, wherein the SEISGRAM software is used for extracting useful (vibration) signals, visualizing and analyzing the microseismic signals, separating and screening wave groups and the like. The MULTILEOK software completes calculation of all rock mass vibration parameters including three-dimensional positioning, energy magnitude and the like. The PLOT software is specially used for data analysis software of an SOS (seismic on demand) microseismic monitoring system. The software can directly call a database of the SOS micro-seismic monitoring system, and data conversion and analysis are carried out on the database to generate a mine seismic monitoring early warning report form, a curve graph, a histogram and the like. The mine microseismic monitoring and analyzing Surfer software is analysis and report software and can be used for data analysis of an SOS microseismic monitoring system. Through the graph, the micro-earthquake occurrence condition can be intuitively reflected in the report.
The microseismic three-dimensional visualization software Seismic 3DView and a microseismic monitoring system form a more complete monitoring and analyzing system, and the analysis of the microseismic time-space distribution rule is more facilitated by combining with a three-dimensional geological model.
The microseismic sensor is installed in the range of a coal mine field, then the three-dimensional coordinate of the installed sensor is input into a system, the recorded data P wave is marked (the determination error of the initial entry time of the P wave is small, the positioning precision is high), the three-dimensional coordinate and the energy size of the mineral earthquake event are obtained through system operation, and the mineral earthquake positioning schematic diagram is shown in figure 5.
In this embodiment, the seismic source is required to have higher accuracy, so that a longitudinal wave (P-wave) which is easier to identify is generally selected for positioning, and the determination error of the first arrival time of the P-wave is smaller and the positioning accuracy is higher compared with other waves. Since it is difficult to determine the propagation time by using any propagation velocity, in practical applications, it is assumed that the propagation time is in a homogeneous and isotropic medium, i.e., the P-wave keeps constant velocity in each propagation direction and has a constant value. The shortest time to travel from the source to the station can be given by equation (2-1):
wherein x is0,y0,z0As source coordinates, t0As seismic source origin time, xi,yi,ziIs the coordinate of the ith observation station, tiTime of arrival of P-wave at ith observation station, v (x)0,y0,z0) Is the propagation speed of the P wave in the medium.
Wherein, the formula (2-1) has (x)0,y0,z0,t0) Four unknowns, data of at least 4 stations are required to solve the equation (most of the SOS microseismic systems put into use in each mining area at present adopt an arrangement form of 16 stations, so that at least more than 4 channels are usually selected for P-wave marking in the embodiment when P-wave marking is performed), and then the energy generated by the seismic source and the three-dimensional coordinates of the position of the seismic source are automatically calculated through other calculation formulas set by the system.
In the present embodiment, as shown in fig. 6, the downhole seismic pick-up sensors 11 are arranged in the following principle: 16 SOS micro-seismic monitoring system seismic sensors 11 are arranged in the Pojiang son coal mine, and are mainly arranged at the following places: the method comprises the following steps of (1#) of a permanent refuge chamber port, 0# of an auxiliary transportation chamber port (2#), 2# of a glue transportation machine head chamber and a rubber belt machine lane intersection (3#), 5# of a glue transportation chamber port (4#), 7# of a glue transportation chamber port (5#), 6#, 3# of a west wing, 3# of a glue transportation lane chamber (7#), 5# of a glue transportation lane chamber (8#) of 0, 6# of a glue transportation chamber (9#), 0# of an auxiliary transportation lane chamber (0F 29 point (10#), 0F35 point (11#) of an auxiliary transportation lane chamber of 0, 173 # of a glue transportation lane chamber port of 0, 93 # of an auxiliary transportation lane chamber of 3, 13# of a belt conveyor, 124 # of an auxiliary transportation lane chamber of 3, 256 # of a belt conveyor (14#), 203 # of a glue transportation chamber of 3, and 16# of a glue transportation duct side of 3 lane.
Therefore, the ground is additionally provided with the aboveground micro-seismic monitoring system, so that the whole underground including the monitoring area is subjected to three-dimensional monitoring, the monitoring precision of underground micro-seismic events in the vertical direction can be obviously improved, the vibration speed type mine seismic measuring probe with the embedded signal transmission module is adopted, the independent trunk line type data transmission system is adopted for bidirectional control transmission, and the remote monitoring and debugging of the working state of the measuring probe can be realized; the anti-interference performance is strong, the operation is stable and reliable, automatic filtering can be realized, interference signals are filtered and denoised, effective signals are automatically screened out, digital collection, transmission and arrangement of monitoring data can be realized, and the monitoring data are accurate.
The regional monitoring method has wide monitoring range, can realize all-around and multi-layer continuous monitoring in the whole well field range, and has high positioning precision and small error. Through the analysis of the complete waveform of the mine earthquake signal, the earthquake type, the occurrence force source and the energy of every earthquake are determined, the mine impact mine pressure danger degree is evaluated, the mine impact mine pressure disaster loss of a coal mine can be greatly reduced, and huge economic benefits and social benefits are generated.
It should be noted that the above is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept also fall within the protection scope of the present invention.
Claims (10)
1. A microseismic monitoring system comprising:
the underground microseismic monitoring system comprises a plurality of microseismic signal acquisition units arranged underground, and the underground microseismic monitoring system comprises a microseismic signal acquisition station, a microseismic signal recording and storing instrument and a PC (personal computer) end which are arranged on the ground;
the microseismic signal acquisition station is used for acquiring microseismic signals detected by the microseismic signal acquisition units, and the microseismic signal recording and storing instrument is connected with the PC end through a local area network and is used for acquiring and recording microseismic data acquired from the microseismic signal acquisition station.
2. The microseismic monitoring system of claim 1 wherein:
the microseismic signal acquisition unit comprises a microseismic sensor and transmits the detected microseismic signal to the microseismic signal acquisition station.
3. The microseismic monitoring system of claim 1 wherein:
the microseismic signal acquisition unit comprises a microseismic sensor, a signal conditioning circuit, a microprocessor and an Ethernet communication module, wherein the microseismic sensor outputs a detected microseismic signal to the microprocessor through the signal conditioning circuit, and the microprocessor establishes communication with the PC terminal through the Ethernet communication module.
4. The microseismic monitoring system of claim 3 wherein:
the signal conditioning circuit comprises an amplifying circuit, a filtering circuit and an A/D conversion module, wherein the amplifying circuit is connected with the vibration pickup sensor, the amplifying circuit is connected with the filtering circuit, and the filtering circuit is connected with the A/D conversion module.
5. A microseismic monitoring system according to claim 2 or 3 wherein:
the seismic pick-up sensors are DLM2001 seismic pick-up sensors, and each DLM2001 seismic pick-up sensor is connected to the microseismic signal acquisition station through lightning protection equipment.
6. The microseismic monitoring system of any of claims 1-4 wherein:
the microseismic signal recording and storing instrument is an AS-1 signal recording and storing instrument, and the AS-1 signal recording and storing instrument is designed based on an IBM PC computer with a 32-channel A/D conversion card embedded therein and is used for converting microseismic signals acquired from the microseismic signal acquisition station into digital signals.
7. The microseismic monitoring system of any of claims 1-4 wherein:
the microseismic signal acquisition station is a DLM-SO signal acquisition station and is used for acquiring microseismic signals transmitted by the seismic pick-up sensor and supplying power to the seismic pick-up sensor.
8. The microseismic monitoring system of claim 4 wherein:
the amplifying circuit comprises an operational amplifier chip IC1 and an operational amplifier chip IC2, wherein the positive end of a power supply of the operational amplifier chip IC1 is connected with one end of a capacitor C2 and a +5V voltage input end, the other end of the capacitor C2 is grounded, the negative end of the power supply of the operational amplifier chip IC1 is connected with one end of a capacitor C3 and the-5V voltage input end, and the other end of the capacitor C3 is grounded;
the output of chip IC1 is put to fortune is connected with the other end of resistance R2, the other end of electric capacity C1, the one end of resistance R3 respectively, the other end of resistance R3 is connected with the one end of electric capacity C4, the one end of resistance R4, the inverting input of chip IC2 is put to fortune respectively, electric capacity C4's other end ground connection, the other end of resistance R4 is connected with the output of chip IC2, the one end of resistance R6 is put to fortune respectively, the other end of resistance R6 with filter circuit's input is connected, ground connection behind the homophase input series connection resistance R5 of chip IC1 is put to fortune.
9. The microseismic monitoring system of claim 4 wherein:
the filter circuit comprises an operational amplifier chip IC21, an operational amplifier chip IC22 and an operational amplifier chip IC23, wherein the inverting input end of the operational amplifier chip IC21 is respectively connected with one end of a resistor R22, one end of a capacitor C22, one end of a resistor R23, one end of a capacitor C23, one end of a capacitor C24 and one end of an adjustable resistor RP21, the other end of the resistor R22 is respectively connected with one end of a resistor R21 and one end of a capacitor C26, the other end of the capacitor C26 is grounded, the other end of the resistor R21 is respectively connected with one end of a capacitor C21 and the input end of the filter circuit, and the other end of the capacitor C21 is connected with the other end of the capacitor C22; the other end of the resistor R23 is respectively connected with the other end of the capacitor C23, one end of the resistor R24 and the output end of the operational amplifier chip IC 21;
the other end of the capacitor C24 is respectively connected with the other end of the adjustable resistor RP21, one end of the capacitor C25 and the output end of the operational amplifier chip IC22, the other end of the capacitor C25 is respectively connected with one end of the adjustable resistor RP22 and the inverting input end of the operational amplifier chip IC22, and the non-inverting input end of the operational amplifier chip IC22 is grounded;
the other end of the capacitor C23 is connected with the other end of the resistor R23, one end of the resistor R24 and the output end of the operational amplifier chip IC22, the other end of the resistor R24 is connected with one end of the resistor R25 and the reverse-phase input end of the operational amplifier chip IC22, the non-inverting input end of the operational amplifier chip IC23 is grounded, and the other end of the resistor R25 is connected with the other end of the adjustable resistor RP22 and the output end of the filter circuit.
10. A method of using a microseismic monitoring system as described in any of claims 1 to 9, the method comprising the steps of:
installing a micro-seismic signal acquisition unit in a to-be-detected area of a coal mine field, inputting a three-dimensional coordinate provided with the micro-seismic signal acquisition unit into a system, marking a recorded data P wave, and obtaining the three-dimensional coordinate and the energy of a mine seismic event through system operation;
connecting each group of underground microseismic signal acquisition units by cables respectively, and then connecting the units with microseismic signal acquisition stations arranged on the well to form a complete monitoring network;
the microseismic signal is acquired by a microseismic sensor and transmitted to a microseismic signal acquisition station on the ground through an industrial Ethernet ring network, the microseismic signal acquisition station transmits the monitored data to a microseismic signal recording and storing instrument in real time for filtering, microseismic event judgment, microseismic event positioning and seismic source parameter determination, and a database of a microseismic monitoring system is called for data conversion and analysis to generate a mine earthquake monitoring early warning report form, a curve graph, a column graph and the like.
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