采动引起的岩体变形及地下水流动的数值分析——非稳定流研究

NUMERICAL ANALYSIS OF ROCK DEFORMATION AND FLOW OF UNDERGROUND WATER CAUSED BY COAL EXTRACTION——INSTABLE FLOW

根据Ｂｉｏｔ固结原理，提出非稳定流孔隙弹性有限元模型，用以研究长壁开采对岩层变形及岩层水文地质环境的影响．研究表明，孔隙压力系数及相对压缩率为两个重要影响参数，特别是后者对流体压力场变化起较大影响，且流体压力分布受固体应力分布控制．由采动引起的岩体变形因而对采场的水文地质环境的变化起到决定性的影响．

Based on Biot consolidation principle, a pore elastic finite element model is proposed for instable flow, which can be used to study the influence of longwall mining on rock deformation and hydrogeological environment. The research shows that pore pressure factor and the relative compression rate are two important parameters, especially the latter has greater influence on the variation of hydrostatic pressure field, and that distribution of hydrostatic pressure is controlled by distribution of solid stress. Therefore, rock deformation due to coal extraction has a decisive influence on the change of hydro geological environment in the workings.