关键词: 露井联采, 关键层, 边坡下巷道, 停采线位置

Abstract: According to the characteristics of open pit mining firstly and the opencast-underground mining secondly, the most hard rock strata in coal seam is determined to be the key strata of mine, and the key stratum is considered as the beam of elastic foundation. The theories of combination girder are used to calculate the upper loads of key stratum. Based on the calculation of stress and deformation of key strata, the stress distribution rule in underlying coal seam in fracture of key strata is obtained, and the slope roadway stability is used as the criterion to set the reasonable position of terminal mining line at underground. By this method, the issues of large roadway stability under slope in Pingshuo mining area can be successfully resolved.

Key words: Opencast-underground mining, Key strata, Roadway under slope, Position of terminal mining line