Deep coal seam mining floor rock stratum fracture distribution spatio-temporal evolution dynamic monitoring method

Abstract

The invention provides a deep coal seam mining floor rock stratum fracture distribution spatio-temporal evolution dynamic monitoring method which comprises the following steps of firstly designing a BOTDR system and a test selection site for mining coal seam floor rock stratum fracture dynamic monitoring according to a coal seam mining working face layout area engineering geology and hydrogeological conditions, and manufacturing and installing a metal cable-based distributed single-mode sensing optical cable; secondly, carrying out deformation consistency calibration on the metal cable-based distributed single-mode sensing optical cable, the drilling filler and the corresponding surrounding rock, and respectively carrying out dynamic monitoring and data analysis on the strain data of the coal seam mining floor by adopting the BOTDR system and AV6419 ANALYER STANDARD analysis software; and finally, according to the judgment basis of coal seam mining floor rock stratum fracture, giving the spatio-temporal evolution characteristics of mining floor rock stratum fracture distribution and the maximum fracture depth of a mining floor. The method can be used for effectively and dynamically monitoring spatio-temporal evolution characteristics of mining coal seam floor rock stratum fracture, and provides a basis for prevention and treatment of deep mining coal seam floor confined water damage.

Description

technical field [0001] The invention belongs to the field of coal mining, and in particular relates to a dynamic monitoring method for the spatio-temporal evolution of the crack distribution of deep coal seam mining floors. Background technique [0002] At this stage, the shallow resources in the central and eastern mining areas of my country are exhausted, and they have fully entered the deep mining mode. Deep mining is accompanied by high water pressure, high temperature, high ground pressure and strong disturbance conditions in deep mining, which makes deep coal seam mining face huge safety challenges; especially the frequent occurrence of high pressure water damage accidents seriously threatens the safe mining of deep coal seams . The necessary condition for the prevention and control of confined water in the deep coal seam floor is to scientifically and effectively find out the temporal and spatial distribution characteristics of the failure cracks in the deep mining c...

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Problems solved by technology

However, studies have shown that the mining fracture process of the coal seam floor is a "compression-tension-compression" strain fracture process, and the strain scale of the coal seam floor is small. Therefore, the above research methods cannot realize dynamic measurement

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