沿空掘巷围岩稳定性实例分析

Research on Stability of Road Driving Along Next Goaf by Examples

通过分析两例分层开采沿空掘巷围岩应力和变形的实测矿压资料 ,得出沿空掘巷成巷期的支承压力影响区是回采期的 2倍 ,但支承压力高峰区均占超前影响范围的 2 /3;围岩变形程度以回采期为主 ,而且下帮 (采空区侧 )顶底板移近量超出上帮 (实体煤侧 )顶底板移近量 2 0 %～30%

Studying actual stress and deformation of two roads driving along next goaf, this paper draws a conclusion that stress influence area in drivage stage is 2 times of extraction stage. However, the proportion of abutment zone tostress influence area is 2/3.Deformation is mainly in extraction stage, roof to floor displacement on dip side is about 20 to 30 percent over rise side.