Hysteresis water inrush warning system and its application method in goaf based on natural potential method

Abstract

The invention discloses a goaf hysteresis water inrush early warning system based on a natural potential method and an application method thereof, belonging to the field of coal mine safety technology and engineering. It includes a data acquisition device, a data processing device, an early warning device and a natural potential monitoring device. The natural potential monitoring device includes a reference electrode and at least one measuring electrode. Each measuring electrode is correspondingly connected to a data acquisition card. The data acquisition card is used to measure The potential signal collected by the electrodes is temporarily stored, and a protection device is installed above each data acquisition card; the natural potential in the goaf is monitored in real time through the natural potential monitoring device. The invention can realize the real-time monitoring of the natural potential of the goaf, through data collection and processing, can monitor the groundwater flowing potential signal of the goaf in real time, can effectively warn the delayed water inrush in the goaf, and effectively reduce or prevent the goaf Potential safety hazard of delayed water inrush.

Description

technical field [0001] The invention belongs to the field of coal mine safety technology and engineering, and in particular relates to a hysteresis water inrush early warning system for gobs based on a natural potential method and a method for using the system. Background technique [0002] The hydrogeological conditions of my country's coal mines are complex, and water inrush occurs from time to time in the working face, especially in the goaf with delayed water inrush. The mine pressure in mining has a serious destructive effect on the floor of the working face, creating new cracks and activating the original fracture structure. Once the water inrush conditions are met, it will cause water inrush on the floor. [0003] At present, the main methods of mine geophysical prospecting for detecting underground hydrogeological conditions include radio perspective method, transient electromagnetic method and direct current method. The radio perspective method is mainly used to de...

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Problems solved by technology

The transient electromagnetic method is mainly used to detect the water content of the roof and floor in the working face and the front of the excavation. It is sensitive to low-resistance bodies and has high detection accuracy, but it is easily disturbed by the surrounding environment.

The construction efficiency of the downhole direct current method is high, and it is less affected by the surrounding environment. However, the downhole direct current method is mainly used to detect the hydrogeological conditions of the roadway roof and floor, and it is powerless to detect the inside of the working face.

[0004] The problem with the above geophysical prospecting methods is that they only detect the hydrogeological conditions of the working face before mining, but cannot monitor the dynamic changes of the hydrogeological conditions during or after mining in real time.

Pre-mining detection cannot guarantee the safety of the goaf floor after mining, and cannot realize real-time monitoring of the coal seam floor status, let alone real-time detection of water level changes at water inrush points

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