Study on the development law of fracture zone in roof and floor of multi-coal seam composite mining
Based on the fracture development of roof and floor of multi-coal seam composite mining in Youzhong Mine,theoretical calculation,numerical simulation and drilling measurement were used to study.The development height of roof caving zone in No.150202 Face was 40.11～63.09 m,50.2 m and 54～57 m respectively,and the variation range of the three methods was basically the same.Combined with the geological conditions and research results of the mine,it could be concluded that the mining fracture zone of No.15 lower coal seam would not conduct the overlying No.3 and No.6 aquifers in the non-structural area,and there was a possibility of water conduction in the occurrence area of penetrating faults or collapse columns.Therefore,coal mine formulated the water prevention and control principle of'geophysical prospecting first,drilling verification,structure investigation,upper prevention and lower mining',which provided the basis for the production of related types of mines.
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