关键词: 超前回采, Mathews稳定图法, 暴露面积, 连锁效应, 采空区稳定性

Abstract: Due to be forced to make ore drawing under surrounding rock and large number of waste rock in ore-body，ore grade in Lijiagou Mining Area of Changba Lead-zinc Mine remains at a low level.The ore-body in 902 m level owns a higher grade and is under an intact occurrence state.Advanced mining of the rich ore in this area can effectively enhance the ore-drawing grade of Lijiagou mining area.According to the engineering geology and the ore body occurrence characteristics in 902 m level，the limit exposed area of the stope and structural parameters are optimized by Mathews stability chart method.Based on the disaster mechanism analysis of goaf collapse ripple effect，the synergistic bearing effect catastrophe model of underground excavation rock system is established，and the stability of pillars and roof in advanced mining region is analyzed.Meanwhile，safety measures including goaf subsequent filling and ground surveillance monitoring system are proposed.Practical results show that：the combination of Mathew stability chart method and the finite element software，data's mutual authentication and decision-making can be achieved，which provides security for advanced mining at 902m of middle section in Lijiagou Mining Area.

Key words: Advanced mining, Mathews stability chart method, Exposed area, Ripple effect, Stability of goaf