采动影响下覆岩垮落过程的数值模拟

采动影响下覆岩垮落过程的数值模拟 English Version

基金项目: 国家杰出青年科学基金!资助项目 (59472 0 1 8);;中科院力学所非线性连续介质力学开放实验室开放基金资助项目

1.Center for Rock Instability Seismicity Research Northeastern University Shenyang 110006 China 2.LNM Institute of Mechanics The Chinese Academy of Sciences Beijing 100080 China

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。
- 覆岩破坏 /
- 数值模拟 /
- 应力分布 /
- 损伤
Abstract: Dynamic progressive process of failure of overlying rock strata caused by mining excavation is simulated by Strata Failure Process Analysis （SFPA2D） 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.
- overburden rock failure /
- numerical simulation /
- stress distribution /
- damage