降雨条件下急倾斜煤层开采的仿真分析

Simulation analysis of steep seam mining under rainfall condition

基于多孔介质流体力学、高等土力学等理论,考虑降雨对急倾斜煤层开采的影响,建立降雨条件下急倾斜煤层开采的流固耦合模型,采用FLAC3D有限差分软件进行数值模拟。通过数值模拟,对降雨条件下急倾斜煤层顶底板附近雨水渗流以及产生的围岩变形进行深入分析,得出不同开采时步下围岩的位移情况,通过与未降雨时围岩变形的对比,得出降雨入渗导致围岩变形加剧的结论。在此基础上,提出了降雨条件下近地表急倾斜煤层围岩在开采过程中的变形情况,为安全开采与防护提供了理论基础和定理依据。

Based on porous media fluid dynamics and advanced soil mechanics,considering the impact of rainfall on steep seam mining,the fluid-solid coupling model of steep seam mining are built under the condition of rainfall and the FLAC3D finite difference software has been adopted in numerical simulation.Through the numerical simulation,the rain water seepage and the surrounding rock deformation around the roof and floor of steep seam are profoundly analyzed and the deformation of the surrounding rock under different mining steps are botained.Through comparison with the non-rainfall deformation,the conclusion is drawn that the rain seepage would intensify the deformation of surrounding rock.Furthermore,the deformation of surrounding rock of the steep seam under the rainfall condition could be predicated,which provides the theoretical foundation for safety mining and mining protection.