宽巷掘进沿空留巷矿压规律数值模拟研究

Numerical Simulation Analysis on Strata Behaviors and the Pressure Law of In-situ Gob-side Entry Retained

采空区顶板岩层分层垮落、岩层的旋转下沉和平移下沉造成巷道围岩次生应力场重新分布,围岩变形严重,因此,掌握沿空留巷采动支承压力影响下顶板岩层运动规律非常必要。针对某矿浅埋煤层、宽巷掘进、预掘留巷位置混凝土砌块沿空留巷的实际情况,通过三维数值模型对留巷围岩应力场、位移场、破坏场进行反演,揭示了留巷围岩矿压活动规律,对巷旁支护墙体受力变形特点、与顶板运动协调变形关系进行了分析,得出工作面轨顺留巷前后巷道围岩变形规律,为沿空保留巷道围岩控制提供了理论依据和技术支持。

Layered roof strata pieces fell, The rotation sinking and panning sinking of the roof strata the lead to distributing afresh of sur- rounding rock stress, surrounding rock deformation is serious, therefore, mastering roof movement rules caused by abutment pressure influence of gob-side entry retained is very necessary. According to actual situation of the shallow seam, due getting wide tunneling, gob-side entry re- tained of concrete blocks, through to three dimensional numerical model to studying surrounding rock stress field, displacement field and dis- ruption field inversion of retained roadway, reveals mine pressure mobile rule of the surrounding rock of retained roadway, stress and deforma- tion characteristics of Lane supporting beside, and roof movement coordinated deformation relationship is analysed, it provides theoretical ba- sis and technical support surrounding rock control of gob-side entry retained.