【摘要】 应用岩层破断过程分析SFPA2D系统 ,分析了采动影响下覆岩破坏的动态发展过程。数值模拟再现了上覆岩层离层、弯曲、沉降、开裂直至冒落的全过程 ,以及采动工作面推进过程中逐步演化的应力场和应变场。根据数值模拟的结果 ,初步探讨了覆岩破断机理 ,指出覆岩的破断特征受分步开挖引起的应力重新分布及其损伤积累以及岩梁的非均质性的影响。更多还原

【Abstract】 Dynamic progressive process of failure of overlying rock strata caused by mining excavation is simulated by Strata Failure Process Analysis (SFPA~ 2D) system. The numerical simulation result reproduces the whole progressive process of vertical discontinuous displacement, bending, sagging, fracturing and caving of overlying rock strata. It also reproduces the evolution of the stress and strain fields as the working face advances. Fracture mechanism is discussed based on the numerical simulation result. It is pointed out that failure characteristic of overburden strata is influenced by stress redistribution and accumulated damage,which are induced by step excavation, and the heterogeneity of rock stratum.更多还原