宽巷掘进沿空留巷矿压规律数值模拟研究

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。

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

Layered roof strata pieces fell,The rotation sinking and panning sinking of the roof strata the lead to distributing afresh of surrounding 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 retained of concrete blocks,through to three dimensional numerical model to studying surrounding rock stress field,displacement field and disruption field inversion of retained roadway,reveals mine pressure mobile rule of the surrounding rock of retained roadway.stress and deformation characteristics of Lane supporting beside,and roof movement coordinated deformation relationship is analysed,it provides theoretical basis and technical support surrounding rock control of gob-side entry retained.