摘要
Abstract
To investigate the impact of deep well extra thick loose layers and multi-working face mining on surface movement and deformation under influence of faults,taking the 1301-1303 working face of Xinglongzhuang Coal Mine as the research object,numerical simulation studies are conducted using FLAC3D software.The research content includes the surface subsidence laws,overburden rock failure forms,and stress field evolution characteristics under single and multiple working face mining conditions.The results show that when the 1301 working face is mined separately,the plastic failure of the overburden rock shows a"saddle shaped"distribution,with a maximum failure height of 190 m,and the surface subsidence curve shows a"V"shape;After the mining of the 1302 and 1303 working faces,the height of overburden rock failure in the old goaf increases by 18.9％and 10.91％respectively,indicating that multi-working face mining significantly exacerbates the degree of overburden rock failure;In addition,multi-working face mining breaks the original stress balance and forms a new stress field under the action of gravity,leading to further increase in the height of failure.The surface subsidence coefficient varies with the increase of the number of working faces,gradually increasing from 0.54(extremely insufficient mining)to 0.84(insufficient mining),and finally stabilizing at 1.15,with a cumulative increase of 112％.This provides a scientific basis for predicting surface movement and disaster prevention and control in deep well extra thick loose layers and multi-working face mining.关键词
断层/巨厚松散层薄基岩/多工作面开采/地表变形/数值模拟Key words
fault/extra thick loose layer thin bedrock/multi-working face mining/surface deformation/numerical simulation分类
矿业与冶金
