High-precision, intrinsically safe coal seam roof water-conducting fracture zone height real-time monitoring method

Abstract

A high-precision and intrinsically safe coal seam roof water guide fracture zone height real-time monitoring method comprises three parts: hole layout, an in-hole fiber grating water pressure monitoring system and a hole mouth fiber grating data acquisition system. Two or more upward monitoring dill holes properly supplied with water via the hole mouths are arranged in advance in the transportation roadways or ventilation roadways on the two sides of a working face against the advancing direction of the working face. Multiple fiber grating hydraulic sensors are linearly arranged in the monitoring holes. The hole mouth fiber grating data acquisition system is connected with the in-hole fiber grating water pressure monitoring system, and is installed at the mouths of the monitoring holes. High-precision, intrinsically safe and real-time monitoring of the whole process of advanced and upward development of the water guide fracture zone of a coal seam roof with the advancing of the workingface can be realized.

Description

Technical field [0001] The invention relates to a method for real-time monitoring of the height of the water-conducting fissure zone of a coal roof, in particular to a high-precision and intrinsically safe method for real-time monitoring of the advance and upward development process of the water-conducting fissure of the coal roof along with the working face. It belongs to the field of mining engineering The technical field of coal mine roof water damage prevention. Background technique [0002] The development process, spatial distribution form, maximum height and other characteristics of coal roof water-conducting cracks are the most important parameters for designing the size of waterproof coal pillars and formulating roof water hazard prevention and control technical schemes to prevent water intrusion in the roof goaf or roof aquifer. Water, controlling the secondary disasters caused by coal mining under large-scale surface water bodies or railways and other buildings. High-...

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Problems solved by technology

[0004] The monitoring results of the surface borehole flushing fluid loss observation method are relatively reliable, but the amount of work is large and the cost is high, which is a typical post-harvest observation method; It is also a post-harvest observation method; the downhole geophysical exploration method is often difficult to clearly identify the hydraulic conductivity of the monitored fractures, so the results are too large, and it can be observed in advance or after harvest; the above three types of methods are difficult to achieve at the same time Real-time on-site monitoring of water-conducting fissures and spatial development patterns

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