水下开采覆岩破坏及导水特征研究

摘要

The discrete element method UDEC is used to study the processes of strata stress change ,the strata movement and the fracture zone of water development during the mining of Tianzhu Coal Mine and the correlations between surface wa-ter and underground mining at different stages are presented .The research result shows when mining in Working Face 3229 , surface water may storage under aquifer in the crack ,not threatening to the mining area ;but with the increase of mining depth of coal seam ,the followed mining area becomes more near to the riverbed ,the risk increases ,especially Working Face 33201 will be threatened ,so necessary measures must be taken to prevent the water burst accidents .%采用离散元程序对天祝煤矿多工作面水下开采后覆岩应力变化、地层移动破坏、导水裂隙带发育和演化随开采过程的规律进行研究，揭示了不同时期地表水系与地下开采间的相互影响。指出3229工作面开采时金沙河水沿裂隙道水带汇集与采区上方围岩，虽不会直接威胁采区生产安全，但随着采掘区向金沙河底靠近，潜在突水危险逐渐加剧，特别是对33201工作面的开采构成直接威胁，必须提前对金沙河水采取必要防渗措施以防止突水事故的发生。