Abstract: Recent years, the number of kilometer well has increasing constantly in China, and the failure form and range of overburden rock also have become more and more serious. Based on overburden rock movements and form and stress distribution characteristics of roof in kilometer well large mining, the failure process of overburden rock of large mining height working face was done by RFPA. The related numerical results have demonstrate that the primary stress transferred to both sides and fan-shaped stress reduced area appears along displacement angle broadly during working face mining of kilometer well is obtained. With the forwarding of working face, failure and displacement of overburden rock appeared obvious distinct zone above goaf, and each zone has obvious different characteristics. But boundary surface transited gradually with spatial form of symmetrical “U-shaped” distribution broadly.

Key words: Kilometer well, Large mining height working face, Numerical simulation, Failure process of overburden rock, RFPA