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Comprehensive Experimental Study on the Migration Law of the Floor at the Mining Face

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Document pages: 10 pages

Abstract: Under the circumstance that deep mining is increasingly vulnerable to underlyinglimestone water, accurate detection of floor failure depth ranges at a miningface becomes rather critical to coal mine production in safety. Underground boreholefiber optic sensing technology is combined with 2-D parallel electricalsurveying to comprehensively monitor and analyze development laws of floor deformationand failure. Moreover, a working face 1022 in a mine of Huaibei Mining Area wastaken, for example, introducing the layout of monitoring borehole andinstallation of relevant sensing units. Based on the stope progress of aworking face, data related to strain and geoelectric fields were collectedregularly to analyze relationships of field source variation characteristicsand strata deformation failures. In this way, the development mechanism of thefloor deformation failure can be revealed. As demonstrated by results, thedepth failure of the floor at coal seam 10 is calculated to be 15 m, while itsdisturbance depth turns out to be 22 m. Due to advanced stress, concentratedstope load and post-mining pressure relief, the floor experienced elasticdeformation, shear deformation and swelling deformation successively. Without adoubt, testing results obtained have scientific guiding significance for mineswith similar geological conditions.

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