Numerical simulation of coal mining in the footwall of large thrust fault with high pressure ordovician water

It is very difficult to prevent and cure the water disaster when the mine suffered the risk of ordovician water under floor, which also is the difficult problem of water prevention and cure both here and abroad. The LiuXin mine in XuZhou is now exploiting the No.7 coal seam in Shansi formation at the footwall of F16 thrust fault. The floor of p No.7 coal seam suffered the high pressure of ordovician water about 7Mpa. The 732 workface is lay parallel the fault strike line under F16 thrust fault, which close to line of intersection of the fault and coal seam about 50m. The fault-throw of F16 fault is 36-200m. the geological exploration indicate, the, thrust, fault have staggered the roof of ordovician strata at the hanging wall up to the No.7 coal seam at the footwall of F16 fault just about 60m. Under the present mining conditions, will the F16 fault move disturbed by rock pressure, will the high pressure,ordovician water-rush into the stope along the fault face and threaten the safety of mine. Those problems must be investigated for the mining works. This paper simulates the mining work of 732 workface by geotechnical engineering soflware FLAC2D and obtained a series of valuable conclusions.