关键词: 预掘巷道群, 断层, 双斜工作面, 支架稳定性

Abstract: For solving the problem of low yield, poor-quality, long duration and low safety factor during longwall face pushing through fault, the technology of fast pushing through fault of the pre-driven roadway groups in fully mechanized top-coal caving face with big dip angle (FMTCFBDA) has been put forward. Considering the fault throw, mining conditions and support stability, the “exceptive horizon” of FMTCFBDA during pushing through fault has been determined and the multiple pre-driven roadways (pre-driven roadway groups) on the horizon has been designed, consequently, working face can directly push through pre-driven roadway groups to cross over the fault. It contains two key technologies: 1) Surrounding rock control technology of pre-driven roadway groups, including pre-driven roadways groups layout, rock pillars size and support parameters, etc; 2) Support stability control technology of FMTCFBDA during pushing through the fault. Considering the strike angle influence on support dip stability and the dip angle influence on support strike stability, hydraulic support instability mechanism has been analyzed during FMTCFBDA in dual inclined state pushing through the fault, the critical support resistance which is less likely to cause topple and slip has been calculated, and corresponding control technology has been put forward. The technology has been applied in 3up1101 FMTCFBDA of Gaozhuang coal mine, and the fault with throw of 13.5 m in 23 days has been fast pushed through successfully, ensuring yield stability of the dual inclined coalface during this period.

Key words: pre-driven roadway groups, fault, dual inclined coalface, support stability