Continuous real-time monitoring method for height of water flowing fractured zone of coal seam roof

Abstract

Provided is a continuous real-time monitoring method for the height of a water flowing fractured zone of a coal seam roof. The method comprises the following steps: arranging at least three to five properly water-filling pitching monitoring holes in roadways on two sides of a working surface in an advancing manner towards a stope direction of a working surface and monitoring a section control range in order to capture the general shape of the water flowing fractured zone, wherein hole-bottom vertical height is more than the estimated height of the water flowing fractured zone; linearly arranging multiple liquid pressure sensors in the water-filling pitching monitoring holes, wherein each liquid pressure sensor is connected with a liquid pressure data acquisition instrument outside holes inparallel through a single channel; and analyzing pressure background value of liquid pressure in the monitoring holes by the liquid pressure data acquisition instrument and utilizing the stair-stepping attenuation sudden-changing features of liquid pressure to determine formation time and heights of water flowing fractures of a top plate in a real-time manner. The dynamic and continuous development process of the water flowing fractures can be further monitored, thereby reducing influence of a test method on a result. Accordingly, monitoring cost is lowered.

Description

technical field [0001] The invention relates to a high-precision underground continuous and real-time monitoring method for the development process and maximum height of water-conducting fissures on the roof of coal seams, and belongs to the technical field of coal mine water disaster prevention and control in the discipline of mining engineering. Background technique [0002] The height of the water-conducting fissure zone is the most important parameter for formulating roof water disaster prevention and control schemes and measures, which are used to prevent water inrush in the roof goaf or aquifer water, control large surface water bodies or secondary disasters caused by coal mining under buildings such as railways, etc. , Highly reliable monitoring of water-conducting fractured zones has been an ongoing issue in engineering and academia. [0003] At present, the monitoring methods for the height of the water-conducting fracture zone mainly include the observation method ...

AI Technical Summary

Problems solved by technology

The monitoring results of surface borehole flushing fluid loss observation method are relatively reliable, but the engineering quantity and cost are relatively high; the segmented water injection process of downhole boreholes is easily affected by many factors, and the representativeness and reliability of monitoring results are reduced; The main problem with the physical prospecting method is that it is difficult to clearly identify the hydraulic conductivity of the monitored fractures.

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