In order to reveal the formation causes of the karst sinkhole /zone development direction in Huainan Coalfield,thus the measures for mining face safely passing through the karst sinkhole could be provided. With the analysis on three main structure line distribution features developed in the east and west directional synclinoria structure basin of Huainan Coalfield,in combination with the distribution features of the karst sinkholes in Huainan Coalfield,a preliminary study was conducted on the development di...