CN111123365B - Goaf lagging water inrush early warning system based on natural potential method and application method thereof - Google Patents

Goaf lagging water inrush early warning system based on natural potential method and application method thereof Download PDF

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CN111123365B
CN111123365B CN201911297310.3A CN201911297310A CN111123365B CN 111123365 B CN111123365 B CN 111123365B CN 201911297310 A CN201911297310 A CN 201911297310A CN 111123365 B CN111123365 B CN 111123365B
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data acquisition
potential
data
goaf
acquisition card
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CN111123365A (en
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徐洪涛
于师建
贺润山
张晓颖
刘震
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Shanxi Shiquan Coal LLC
Shandong University of Science and Technology
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Shanxi Shiquan Coal LLC
Shandong University of Science and Technology
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Priority to PCT/CN2020/122704 priority patent/WO2021120833A1/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/082Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices operating with fields produced by spontaneous potentials, e.g. electrochemical or produced by telluric currents
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/30Assessment of water resources

Abstract

The invention discloses a goaf lagging water inrush early warning system based on a natural potential method and a using method thereof, and belongs to the field of coal mine safety technology and engineering. The device comprises a data acquisition device, a data processing device, an early warning device and a natural potential monitoring device, wherein the natural potential monitoring device comprises a reference electrode and at least one measuring electrode, each measuring electrode is correspondingly connected with a data acquisition card, the data acquisition cards are used for temporarily storing potential signals acquired by the measuring electrodes, and a protection device is arranged above each data acquisition card; and monitoring the natural potential in the goaf in real time through a natural potential monitoring device. The invention can realize real-time monitoring of the natural potential of the goaf, can monitor the underground water electrokinetic potential signal of the goaf in real time through data acquisition and processing, can effectively warn the lagging water inrush of the goaf, and effectively reduces or prevents the potential safety hazard of the lagging water inrush of the goaf.

Description

Goaf lagging water inrush early warning system based on natural potential method and application method thereof
Technical Field
The invention belongs to the field of coal mine safety technology and engineering, and particularly relates to a goaf lagging water inrush early warning system based on a natural potential method and a use method of the goaf lagging water inrush early warning system.
Background
The hydrogeological conditions of coal mines in China are complex, water inrush in a working face occurs frequently, and particularly the lagging water inrush in a goaf occurs. Mine pressure in mining has a severe destructive effect on the working face floor, creates new fractures, activates the original fractured structure, and once the water inrush conditions are met, can cause floor water inrush.
At present, the main methods for mine geophysical prospecting for detecting underground hydrogeological conditions comprise a radio perspective method, a transient electromagnetic method and a direct current method. The radio perspective method is mainly used for exploring the geological structure development and the coal body structure and thickness change inside the working face. The transient electromagnetic method is mainly used for detecting the water content of the top and bottom plates in the working face and in front of the tunneling, is sensitive to low-resistance bodies, has high detection accuracy, and is easily interfered by the surrounding environment. The underground direct current method is high in construction efficiency and is slightly influenced by the surrounding environment, but the underground direct current method mainly detects the hydrogeological conditions of the top and the bottom of a roadway and has no effect on the detection in a working face.
The geophysical prospecting methods have the problems that only the hydrogeological condition of the working face before mining is explored, and the dynamic change of the hydrogeological condition in the working face mining process or after mining cannot be monitored in real time.
The water blocking effect is mainly an effective water-resisting layer, and if the damage depth of mine pressure to the bottom plate is large, the thickness of the water-resisting layer is relatively reduced, so that the thickness of the water-resisting layer is continuously changed in the stoping process. The detection before mining can not ensure the safety of the goaf floor after stoping, can not realize the real-time monitoring of the coal bed floor condition, and can not detect the water level change condition of the water inrush point in real time.
Disclosure of Invention
The invention aims to provide a goaf lagging water inrush early warning system based on a natural potential method and a using method thereof, which can realize real-time monitoring of the condition of a coal seam floor, probe the water level change condition of a water inrush point in real time, effectively early warn the goaf lagging water inrush and effectively reduce or prevent the potential safety hazard of the goaf lagging water inrush.
One of the tasks of the invention is to provide a goaf lagging water burst early warning system based on a natural potential method, which adopts the following technical scheme:
a goaf lag water burst early warning system based on a natural potential method comprises a data acquisition device, a data processing device, an early warning device and a natural potential monitoring device, wherein the natural potential monitoring device comprises a reference electrode and at least one measuring electrode connected with the reference electrode, the reference electrode and all the measuring electrodes are arranged in roadways on two sides of a goaf, each measuring electrode is correspondingly connected with a data acquisition card, the data acquisition card is used for temporarily storing potential signals acquired by the measuring electrodes, and a protection device is arranged above each data acquisition card;
each data acquisition card is connected to the data acquisition device in a serial mode, the data acquisition device simultaneously sends instructions to each data acquisition card, and potential signals of the positions of the measurement electrodes are simultaneously extracted at the same time or data are acquired at fixed intervals;
the data processing device is used for processing the acquired data according to the time, the number of the measuring electrode, the potential size and the relation between the natural potential signal and the flowing potential of the underground water;
the early warning device sets an alarm threshold value according to the dynamic change of the flowing potential, and immediately sends out an alarm signal if the potential signal exceeds the threshold value.
As a preferred scheme of the invention, each data acquisition card comprises a preposed low-pass filter which is used for acquiring a natural potential signal of 0-5 Hz; and each data acquisition card is connected with the corresponding measuring electrode in a welding mode.
As another preferable scheme of the invention, the adjacent measuring electrodes are arranged at equal intervals, and the interval is 10 m.
Further preferably, the reference electrode and the measuring electrode are both unpolarized electrodes.
Preferably, the data acquisition device, the data processing device and the early warning device are all connected with a power supply through circuits, and the data acquisition card is connected with the power supply through a power line.
Furthermore, the protection device is a cover body which is buckled above the corresponding data acquisition card, holes are formed in the left side, the right side and the bottom of the cover body, and the upper cover of the cover body can be opened/closed.
Furthermore, the cover body is made of polyurethane materials.
Furthermore, the power line and the data line are laid by adopting the same pipeline, and are externally wrapped by a PVC pipeline for preventing the corrosion of the line.
The invention also provides a use method of the goaf lagging water inrush early warning system based on the natural potential method, which sequentially comprises the following steps of:
a. digging cable trenches with certain depth in roadways at two sides of the goaf respectively, and digging electrode grooves in the cable trenches at intervals;
b. burying a cable, wrapping a power line and a data line with PVC pipelines, laying a ground wire at infinite distance, and grounding a data acquisition device;
c. welding a data acquisition card and a measuring electrode corresponding to the data acquisition card, inserting the measuring electrode into a rock stratum in the electrode groove after welding, and arranging a protection device above the data acquisition card;
d. if the connection condition of each device is intact, starting a data acquisition device, sending an instruction to each measuring electrode through the data acquisition device, detecting the natural potential of the position of each measuring electrode, temporarily storing potential data in a corresponding data acquisition card, and sending the instruction again by the data acquisition device to simultaneously extract the data in the data acquisition card;
e. the potential data extracted by the data acquisition device is transmitted to the data processing device, and the data are processed by the data processing device according to the time, the number of the measuring electrode, the potential size and the relation between the natural potential signal and the flowing potential of the groundwater;
f. and transmitting the processed data to an early warning device, and immediately sending out a warning signal if the potential signal exceeds the set warning threshold value.
The monitoring principle of the natural potential monitoring device of the invention is as follows:
when groundwater gushes upwards through the fissure zone, due to the filtering effect, surplus positive charges are presented at the position where the groundwater is exposed, a plurality of negative charges are left in the underground depth, the potential of the electric field distribution form at the position where the groundwater gushes upwards through the fissure zone reaches the maximum value, and the natural potential method is based on the principle, so that the real-time monitoring of the flow potential of the groundwater in the goaf can be realized.
Compared with the prior art, the invention has the following beneficial technical effects:
the goaf lagging water inrush early warning system based on the natural potential method comprises a natural potential monitoring device, a data acquisition device, a data processing device and an early warning device, wherein the natural potential in the goaf is monitored in real time through the natural potential monitoring device, the data acquisition device simultaneously controls and measures natural potential signals of positions of electrodes, interference potentials generated by industrial stray currents can be eliminated, and changes of the potential signals are accurately determined; the data processing device processes the potential signal to obtain a flowing potential signal of the underground water corresponding to the natural potential signal, and if the dynamic change of the flowing potential exceeds an alarm threshold value, the system can immediately send out early warning.
The invention can realize real-time monitoring of the natural potential of the goaf, can monitor the underground water electrokinetic potential signal of the goaf in real time through data acquisition and processing, can effectively warn the lagging water inrush of the goaf, and effectively reduces or prevents the potential safety hazard of the lagging water inrush of the goaf.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural diagram of a goaf lagging water inrush early warning system based on a natural potential method;
FIG. 2 is a schematic diagram of the arrangement of electrodes in a goaf roadway by the natural potential monitoring device of the present invention;
FIG. 3 is a sectional view taken along line A-A of FIG. 2;
FIG. 4 is a sectional view taken along line B-B of FIG. 2;
FIG. 5 is an enlarged view of the bore of FIG. 4;
in the figure, 1, a data acquisition device, 2, a reference electrode, 3, a measuring electrode, 4, a goaf, 5, a data acquisition card, 7, a protection device, 8, a rock stratum, 9 and a working face.
Detailed Description
The invention provides a goaf lagging water inrush early warning system based on a natural potential method and a using method thereof, and in order to make the advantages and technical scheme of the invention clearer and clearer, the invention is described in detail below by combining specific embodiments.
As shown in fig. 1, the goaf lagging water burst early warning system based on the natural potential method comprises a data acquisition device 1, a data processing device, an early warning device and a natural potential monitoring device, wherein the data acquisition device simultaneously sends instructions to each data acquisition card, potential signals of positions of measurement electrodes are simultaneously extracted at the same time, and data can be acquired at fixed intervals; the data processing device processes the acquired data according to the time, the number of the measuring electrode, the magnitude of the potential and the relationship between the natural potential signal and the flowing potential of the underground water; the early warning device sets an alarm threshold according to the dynamic change of the flowing potential, and if the potential signal exceeds the threshold, the early warning device immediately sends out an alarm signal.
The detailed structures of the data acquisition device, the data processing device and the early warning device can be realized by referring to the prior art, and detailed description is not provided herein, and the main improvement point of the invention, the structure of the natural potential monitoring device and the arrangement method thereof are described in detail below.
Referring to fig. 3 to 5, the natural potential monitoring device includes a reference electrode 2 and at least one measuring electrode 3 connected to the reference electrode, the reference electrode and the measuring electrode are both disposed in the roadways on both sides of the gob 4, each measuring electrode is correspondingly connected to a data acquisition card 5, preferably, the data acquisition card is welded to the measuring electrode, and the data acquisition card 5 can temporarily store the potential signal acquired by the measuring electrode and finally transmit the potential signal to the data acquisition device; a protection device 7 is also arranged above each data acquisition card. The data acquisition cards 5 are connected together in a serial mode and finally connected with the data measurement device 1, and by the design, the natural potential monitoring device can monitor the natural potential in the goaf in real time, and the data acquisition device controls and measures the natural potential signals of the positions of the electrodes at the same time, so that the interference potential generated by industrial stray current can be eliminated, and the change of the potential signals can be accurately determined. The data processing device is used for processing the acquired data according to the time, the number of the measuring electrodes, the potential and the relation between the natural potential signal and the flowing potential of the underground water, so as to obtain an underground water flowing potential signal corresponding to the natural potential signal, and if the dynamic change of the flowing potential exceeds an alarm threshold value, the early warning device can immediately send out early warning.
The specific number of the measuring electrodes 3 can be selected by a person skilled in the art according to actual conditions, the measuring electrodes are uniformly distributed, the distance between monitoring points of adjacent measuring and controlling electrodes is 10m, the electrode material is a non-polarized electrode, the magnetic rod electrode is adopted, the potential difference of the non-polarized magnetic rod electrode is small, the electrical characteristics are stable, and the accuracy and the stability of monitoring data are ensured.
The invention applies the natural potential monitoring device to the goaf lagging water inrush early warning system for the first time, and can realize real-time monitoring of the underground water flowing potential in the goaf.
The data acquisition card preferably comprises a pre-low-pass filter (0-5 Hz), only acquires a natural potential signal of 0-5 Hz, and eliminates an interference potential signal generated by industrial stray current.
Each data acquisition card is connected with a data acquisition device through a data line in a serial mode, each data acquisition card is also connected with a power line, the other end of the power line is connected to a power supply, the power line and the data line are laid by the same pipeline, and a PVC pipeline is wrapped outside the power line and used for preventing the circuit from being corroded.
The protection device is in the shape of a cover body, a part of the corresponding data acquisition card and the corresponding measuring electrode can be buckled inside the protection device, holes are formed in the left side, the right side and the bottom of the cover body, circuit connection is facilitated, and the upper cover of the cover body can be opened/closed, so that the data acquisition card can be conveniently checked and maintained. The cover body is made of polyurethane material, and the material has high mechanical strength, good wear resistance and weather resistance and long service life.
The use method of the goaf lagging water inrush early warning system based on the natural potential method comprises the following steps:
step one, installation:
digging cable trenches with certain depth in roadways at two sides of the goaf respectively, and digging electrode grooves in the cable trenches at intervals;
burying a cable, wrapping a power line and a data line with PVC pipelines, laying a ground wire at infinite distance, and grounding a data acquisition device;
welding a data acquisition card and a measuring electrode corresponding to the data acquisition card, inserting the measuring electrode into a rock stratum in the electrode groove after welding, and arranging a protection device above the data acquisition card;
step two, monitoring:
if the connection condition of each device is intact, starting a data acquisition device, sending an instruction to each measuring electrode through the data acquisition device, detecting the natural potential of the position of each measuring electrode, temporarily storing potential data in a corresponding data acquisition card, and sending the instruction again by the data acquisition device to simultaneously extract the data in the data acquisition card;
the potential data extracted by the data acquisition device is transmitted to the data processing device, and the data are processed by the data processing device according to the time, the number of the measuring electrode, the potential size and the relation between the natural potential signal and the flowing potential of the groundwater;
and transmitting the processed data to an early warning device, and immediately sending out a warning signal if the potential signal exceeds the set warning threshold value.
The present invention will be described in detail with reference to the following specific examples:
example 1:
as shown in fig. 2, the method specifically includes the following steps:
respectively digging a cable trench with the depth of 0.3m in roadways at two sides of a goaf, and digging an electrode groove with the diameter of 0.2m and the depth of 0.5m in the cable trench every 10 m;
step two, burying a cable, wrapping a power line and a data line with PVC pipelines, laying the PVC pipelines in the same pipe, laying a ground wire at infinity, and grounding the data acquisition device;
welding the data acquisition card and the measuring electrode, inserting the measuring electrode into a rock stratum in the electrode groove after welding, and placing a protection device above the data acquisition card;
after the cable and the electrode are determined to be embedded, all the devices are connected, and measurement can be carried out after the connection condition of all the devices is checked to be intact;
step four, starting the data acquisition device, sending an instruction to each measuring electrode by the data acquisition device, detecting the natural potential of the position of each electrode, temporarily storing potential data in the data acquisition card, and sending the instruction again by the data acquisition device to simultaneously extract the data;
fifthly, the extracted potential data are transmitted to a data processing device, and the data are processed by a data acquisition device according to the time, the number of the measuring electrodes, the potential size and the relation between the natural potential signals and the flowing potential of the groundwater;
and step six, transmitting the processed data to an early warning device, and immediately sending out a warning signal if the potential signal exceeds a set warning threshold value.
The parts which are not described in the invention can be realized by taking the prior art as reference.
It should be noted that: any equivalents, or obvious variations thereof, which may occur to those skilled in the art and which are commensurate with the teachings of this disclosure, are intended to be within the scope of this invention.

Claims (2)

1. The utility model provides a collecting space area lag water inrush early warning system based on natural potential method, its includes data acquisition device, data processing device, early warning device, its characterized in that:
the device comprises a collecting electrode, a natural potential monitoring device and a data acquisition card, wherein the natural potential monitoring device comprises a reference electrode and at least one measuring electrode connected with the reference electrode, the reference electrode and all the measuring electrodes are arranged in roadways at two sides of a goaf, each measuring electrode is correspondingly connected with one data acquisition card, the data acquisition cards are used for temporarily storing potential signals acquired by the measuring electrodes, and a protection device is arranged above each data acquisition card;
each data acquisition card is connected to the data acquisition device in a serial mode, the data acquisition device simultaneously sends instructions to each data acquisition card, and potential signals of the positions of the measurement electrodes are simultaneously extracted at the same time or data are acquired at fixed intervals;
the data processing device is used for processing the acquired data according to the time, the number of the measuring electrode, the potential size and the relation between the natural potential signal and the flowing potential of the underground water;
the early warning device sets an alarm threshold according to the dynamic change of the flowing potential, and immediately sends out an alarm signal if the potential signal exceeds the threshold;
each data acquisition card comprises a front low-pass filter which is used for acquiring natural potential signals of 0-5 Hz; each data acquisition card is connected with the corresponding measuring electrode in a welding mode;
the adjacent measuring electrodes are arranged at equal intervals, and the interval is 10 m;
the reference electrode and the measuring electrode are both nonpolarized electrodes;
the data acquisition device, the data processing device and the early warning device are all connected with a power supply through circuits, and the data acquisition card is connected with the power supply through a power line;
the protection device is a cover body which is buckled above the corresponding data acquisition card, holes are formed in the left side, the right side and the bottom of the cover body, and the upper cover of the cover body can be opened/closed;
the cover body is made of polyurethane material;
the power line and the data line are laid by adopting the same pipeline, and are wrapped by a PVC pipeline for preventing the line corrosion.
2. The use method of the goaf lagging water inrush warning system based on the natural potential method as claimed in claim 1, is characterized by sequentially comprising the following steps:
a. digging cable trenches with certain depth in roadways at two sides of the goaf respectively, and digging electrode grooves in the cable trenches at intervals;
b. burying a cable, wrapping a power line and a data line with PVC pipelines, laying a ground wire at infinite distance, and grounding a data acquisition device;
c. welding a data acquisition card and a measuring electrode corresponding to the data acquisition card, inserting the measuring electrode into a rock stratum in the electrode groove after welding, and arranging a protection device above the data acquisition card;
d. if the connection condition of each device is intact, starting a data acquisition device, sending an instruction to each measuring electrode through the data acquisition device, detecting the natural potential of the position of each measuring electrode, temporarily storing potential data in a corresponding data acquisition card, and sending the instruction again by the data acquisition device to simultaneously extract the data in the data acquisition card;
e. the potential data extracted by the data acquisition device is transmitted to the data processing device, and the data are processed by the data processing device according to the time, the number of the measuring electrode, the potential size and the relation between the natural potential signal and the flowing potential of the groundwater;
f. and transmitting the processed data to an early warning device, and immediately sending out a warning signal if the potential signal exceeds the set warning threshold value.
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PCT/CN2020/122704 WO2021120833A1 (en) 2019-12-17 2020-10-22 Self-potential method-based early warning system for delayed water bursting in goaf region and use method therefor

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114088782A (en) * 2021-10-18 2022-02-25 中国矿业大学 Potential identification method for coal rock mass water inrush danger area under stress and seepage action
CN114088782B (en) * 2021-10-18 2022-05-17 中国矿业大学 Potential identification method for coal rock mass water inrush danger area under stress and seepage action

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