Evolution Mechanism of Water-Conducting Channel of Collapse Column in Karst Mining Area of Southwest China

There are many karst collapse columns in coal seam roof the southern field China, which different from those floor northern field, due to stratum characteristics. The column tends reactivate and conduct water induce serious inrush disaster, when communicates with overlying aquifer. In order reveal evolution mechanism of water-conducting channel mining area southwest aquifers inflow rule 1908 working face Qianjin mine analyzed. Besides, particle size distribution mineral component researched by X-ray diffraction test screening method, basis for researching column. On this basis, under influence is establishing numerical calculation model UDEC software. results show that flowing into comes Changxing formation aquifer Yulongshan above seam, proportion coarse particles fine 89.86% 10.14%, respectively. With advance face, connected aquifer, or surface formed pits, caves, research can be treated as an important water-preserved China.