The stability monitoring system and method of coal mine roof aquifer based on fiber grating

Abstract

Disclosed is a coal mine top plate aquiclude stability monitoring system based on a fiber Bragg grating. A measurement station is arranged on a work surface mining roadway, a vertical top plate drilling hole is drilled in a top plate of the work surface mining roadway to an aquiclude, a fiber Bragg grating pressure sensor is arranged at the top end of the drilling hole, a fiber Bragg grating top plate bed separation instrument is installed at the height position of the drilling hole between the aquiclude and a rock stratum below, and an optical fiber connector is led out of the drilling hole and connected with an optical fiber tail fiber, thereby being connected with an optical fiber splitter. The optical fiber connector is connected with an optical fiber terminal box through a communication optical fiber and connected to an optical fiber interrogator of a ground control chamber through a mining optical cable, signals are transmitted to a monitoring server after demodulation and are processed through the monitoring server, and the data processing result is shared with a client side through a mine local area network. The stability conditions of the aquiclude are monitored in real time through a computer display, and an alarm is given timely when the stress is near the bearing upper limit of the aquiclude and separation occurs between the aquiclude and the overlying strata blow.

Description

technical field [0001] The invention relates to a coal mine roof aquifer stability monitoring system and method, in particular to a coal mine roof aquifer stability monitoring system and method based on optical fiber gratings. Background technique [0002] my country's coal mines are mostly distributed in the north and northwest regions where water is scarce, and many mining areas are short of water resources. The mining practice has proved that the movement of the overlying rock layer caused by mining will cause the instability of the aquifer, lead to the loss of a large amount of groundwater resources, and seriously damage the ecological environment of the mining area. In this regard, Chinese scholars have carried out a lot of research and practice, and proposed to achieve sustainable development of water conservation mining, that is, to ensure the stability of the aquifer during the mining process, so that the water above the mining area will not be lost. [0003] At pre...

AI Technical Summary

Problems solved by technology

[0003] At present, there is no well-formed method for monitoring the stability of the aquifer. The success of water-retaining mining is predicted by the degree of water leakage on the roof of the goaf. The error is large, and the stability of the aquifer cannot be reflected in time, which is missed. When to Take Measures to Ensure Aquitard Stability

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