Coal seam mining overlying strata settlement state identification method

Abstract

The invention provides a coal seam mining overlying strata settlement state identification method. According to the coal seam mining overlying strata settlement state identification method, a sensingoptical fiber is vertically mounted in a coal seam overlying strata in a drilling manner, strain distribution of the overlying strata along with time caused by coal seam mining is measured, the heightof a water guide fracture zone is determined based on shear stress and dependent variable values borne by the sensing optical fiber, and the development height of a caving zone and the development height of a fissure zone are comprehensively judged in combination with 'building, water body, railway and main roadway coal pillar reservation and pressed coal mining specifications'. A coal seam mining overlying strata zoning settlement calculation model is constructed, settlement amounts of caving zones, fissure zones, bending subsidence zones and rock-soil bodies above the caving zones, the fissure zones and the bending subsidence zones in the mining overlying strata are calculated, and the settlement amounts of the zones are accumulated to obtain a ground surface settlement amount caused bycoal seam mining. The coal seam mining overlying strata settlement state identification method has the advantages of distributed monitoring, simple and convenient process, high identification precision and the like, is suitable for mastering the deformation evolution rule of the coal seam mining overlying strata along with time and judging the settlement stability, and has wide practicability inthe technical field.

Description

technical field [0001] The invention relates to a method for identifying the settlement state of overburden rock caused by coal seam mining, in particular to a method for identifying the settlement state of overburden rock based on distributed optical fiber sensing technology. Background technique [0002] Coal seam mining will cause deformation and destruction of the upper rock and soil mass and move to the goaf, gradually forming collapse zones, fracture zones and curved subsidence zones in the overlying rock. Factors such as the direction, inclination and buried depth of the coal seam and the working face will affect the deformation range and damage degree of the overlying rock. Therefore, it is of great significance to determine the change value of overlying rock settlement over time in coal seam mining and identify the deformation and failure state of overlying rock for the control of overlying rock strata during coal seam mining and the development and management of go...

AI Technical Summary

Problems solved by technology

The burial depth of coal seams in coal mines generally reaches hundreds of meters, or even exceeds thousands of meters. The measurement method based on point sensors such as displacement meters and steel bar stress gauges is prone to missed detection, low precision and susceptibility to electromagnetic waves due to the limited number of buried sensors. Interference and other issues

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