Water inrush and failure characteristics of coal seam floor over a confined aquifer
نویسندگان
چکیده
Failure behaviors of the floor rocks under coal seam mining in conditions hard magma rock roof and confined aquifer are studied. Based on theory stresses elasticity mechanics, combined effects abutment pressure induced by water thin aquicludes were considered, a mechanical model was constructed along strike working face. An analytical solution stress distribution derived rocks, distributions vertical, horizontal shear calculated. In combination with in-situ measurement, results show that: 1) when periodic caused collapse occurs face, maximum concentration appears at elastic–plastic junction direction With increase depth floor, coefficient tends to decrease, corresponding isoline shows “symmetric spiral” propagates downward certain angle vertical direction. This causes generate compression or tension failure. 2) immediate is rock, trend slow initially then rapid later. The peak value location 4–6 meters from wall between 1.4 1.8. 3) according measurement calculation failure depths different positions same seam, it found that near reduces 11.6% after goes through “the caving re-compaction”, which fractures close thickness effective aquiclude increases. un-mined area 55% depth. 4) both theoretical numerical simulation increases obviously action high pressure. Under condition relatively thin, intensity sensitive factors affect floor. As increases, getting closer Ordovician Limestone. study provides an improved understand support for safe seams similar conditions.
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ژورنال
عنوان ژورنال: Energy Reports
سال: 2021
ISSN: ['2352-4847']
DOI: https://doi.org/10.1016/j.egyr.2021.09.023