173 Research and Cause Analysis of Ground Subsidence for Pingding Shan Coalfield

Based on detailed field observation, the study discussed the current development of the ground subsidence and distribution in Pingding Shan coalfield. Furthermore, from following there aspects, rock mass stress field change, the groundwater drainage, faultage structure, the causes of formation of ground subsidence in Pingding Shan coalfield were analyzed deeply. The result of investigation and analysis made clear: subsidence of large bound caused by the groundwater drainage was the major reason.