Goaf lag water inrush early warning system based on natural potential method and using method thereof

Abstract

The invention, which belongs to the field of coal mine safety technologies and engineering, discloses a goaf lag water inrush early warning system based on a natural potential method and a using method thereof. The system comprises a data acquisition device, a data processing device, an early warning device and a natural potential monitoring device. 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 card is used for temporarily storing potential signals acquired by the measuring electrodes; and a protection device is arranged above each data acquisition card. The natural potential in the goaf is monitored in real time through the natural potential monitoring device. The real-time monitoring of the natural potential of the goaf can be realized, the flowing potential signal of the underground water in the goaf can be monitoredin real time through data acquisition and processing, the effective early warning of the lagging water inrush of the goaf can be realized, and the potential safety hazard of the lagging water inrushof the goaf can be effectively reduced or prevented.

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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