采动影响下强充水型隐伏岩溶陷落柱围岩变形与渗流场数值模拟  

NUMERICAL SIMULATION OF ROCK DEFORMATION AND SEEPAGE FIELD WITH A FULLY-WATER KARSTIC COLLAPSE COLUMN UNDER MINING INFLUENCE

作　　者：张均锋[1] 张华玲[1] 孟达[1] 曹杰[1] 

机构地区：[1]中国科学院力学研究所,北京100080

出　　处：《岩石力学与工程学报》2009年第A01期2824-2829,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(10672167);中国科学院知识创新工程领域前沿项目资助;河北金能集团2007年科技项目(3-07-007)

摘　　要：通过引入孔隙水作用于围岩的体积力项F′,采用弹塑性本构模型和达西渗流模型,有限元数值模拟和分析存在一穿透煤层的强充水型隐伏岩溶陷落柱时的带压开采过程中,煤层围岩的变形和渗流场随采煤工作面逐步接近陷落柱时的变化规律,探讨孔隙水压力对围岩变形的影响,并分析在存在岩溶陷落柱条件下的合理防水煤柱预留距离。数值模拟结果可为含特殊地质构造煤层的开采设计提供依据,同时为进一步的流固耦合作用和煤层底板突水机制的研究以及防水煤柱的留设提供一定的参考。The deformation of surrounding rock and the seepage field of pore water with a fully-water karstic collapse column in the process of coal mining are numerically simulated by finite element method, in which elastoplastic constitutive model for the coal layer and the surrounding rock and Darcy＇s seepage model for pore water are adopted. The body force F＇ is introduced to describe the coupling influence of pore water pressure on the deformation of surrounding rock. The varying characteristics of stress, plastic deformation and seepage velocity with the mining process are probed. The damage areas in the surrounding rock and the coal layer with the decrease of the distance between the mining face and the karstic collapse columns are computed, and the distance from the mining face to the karstic collapse columns needed as the reserved coal column for prevention of water inrush is also quantitatively given. Besides, the results for two cases, one with the existence of the body force F＇ and another without the existence of the body force F＇, are compared to show the effect of solid-liquid coupling. The result is helpful for coal mining design under complicated geological structure. It is also useful for further analysis of fluid-solid coupling, and study of the mechanism of water inrush from coal floor, as well as proper design of coal pillar to prevent water inrush in coal layer.

关 键 词：数值模拟 带压开采 陷落柱 底板突水 流固耦合 

分 类 号：O242[理学—计算数学]