Study Of Joint Support And Construction Of Large Fracture Room In HS Soft Rock

The mean of karst collapse column is that soluble rock is buried in the lower coal measure strata, so is affected by groundwater, and carbonate is dissolution into large caverns, so lost the ability to withstand pressure of the upper rock. The karst collapse column is closely linked with karst water as the special concealed geological structures. So, permeable subsided column greatly threat mine production, and water inrush of permeable subsided column has hidden and unexpected, so harm coal mine production safety.This article combines 4325 face of Daizhuang coal, on the basis of analysis of the formation mechanism of collapse column and water conduction mechanism, and uses theoretical analysis and similar simulation as research methods, and research impact of seam floor, column and wall rock collapse by stress generated by coal mining on process of mining, and proposed control measures of face collapse column into ensure safety, and provide a useful reference for mine of similar mining conditions.This article has done the work as follow:The first, this article analyzes the causes of collapse columns, growth mechanism and the mechanism of water conduction in theory on the basis of search literature;The second, this article analyzes the situations of face of collapse columns from the morphology, growth characteristics, including (director) with the main aquifer water and hydraulic connections by detection means of ground electromagnetic survey, face pit of mine detection and mine-site through the drilling works, and provides a basis for face security collapsed column;The third, this article has numerical simulation using similar materials, and analysis mines in the ground water pressure and the pressure under the action of stress field generated by coal floor, column and wall rock collapse and destruction of the degree of influence range of roof and floor, sink hole and the surrounding rock stress and changes in plastic zone in theory on process of working, provides a basis for face security collapsed column.