Research on Development Depth of Mining Fracture in Non-flowing Water Collapse Column

In order to explore the influence of coal mining on rock mass within the structure, taking Chengzhuang Coal Mine of Jincheng Anthracite Mining Group as testing site, through the contrast analysis of floor destruction in normal coal seam and non-flowing water collapse column, we comprehensively research the laws of mining fractures within structure. The results show that the results of floor mining-induced damage depth for normal coal seam and tectonic coal seam from numerical simulation, theoretical calculation and engineering tests are 19 m and 31 m; the data matched each other very well. In other word, the mining-induced fracture depth of non-flowing water collapse column is 1.7 times of the normal coal seam.