标题：Study on the depth of damaged floor in upper layer mining
作者：Shi, Long Qing ;Niu, Chao ;Le Xiao, Le ;Liu, Lei ;Li, Xiao Meng ;Li, Wen Jun
作者机构：[Shi, Long Qing ;Niu, Chao ;Le Xiao, Le ] Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, College of Earth 更多
会议名称：International Conference on Frontier of Energy and Environment Engineering, ICFEEE 2014
会议日期：December 6, 2014 - December 7, 2014
来源：Environment, Energy and Applied Technology - Proceedings of the 2014 3rd International Conference on Frontier of Energy and Environment Engineering, ICFEEE 2014
摘要：In Jiaozuo coalfield, the coal mining characteristics are large mining depth, high pressure, thin relative aquifuge of floor, according to these characteristics, the author calculated the floor failure depth and carried out the field test using the procedures and theoretical formula, made a study on the water-inrush problem from floor in upper layer of NO. 2 coal seam in mining process. Using the double side blocked leak detection device, respectively detected the floor damage of the upper layer of the NO. 2 coal seam in the pre-mining and the post-mining, on the basis of the direct proportion relationship between the water leakage from blocked segment and the fracture development degree, made a quantitative analysis of the depth and connectivity of the mining floor fracture. The field test data shows that the floor damage depth calculation formula based on the “down four zone” theory is most close to the field test results which the depth of damaged floor in the upper layer mining is 15.99 m in the study area.
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