基于不同工作面长度对覆岩移动破坏的数值模拟

摘要

为了满足矿床开采的需要,布置长距离的工作面减少巷道回采工作量,提高回采效率,以内蒙古北山盘陀山钨矿南部矿段为研究背景,采用FLAC3D进行数值模拟,通过分析不同高度覆岩内部应力及地表下沉曲率的变化,研究矿层在不同工作面长度开采过程中对覆岩移动变形和破坏的影响.结果表明:当矿层开采的距离相同时,随着工作面长度的增加覆岩内部应力平均值和地表下沉量增大的幅度在逐渐减小,通过对比预测不同工作面长度对覆岩内部的扰动情况,对地表沉陷控制、建筑物保护和工作面的安全生产具有重要作用.%Taking the northern section of the northern Bentutuan tungsten deposit in Beishan, Inner Mongolia as a research background, FLAC3Dwas used for numerical simulation. By analyzing the variation of internal stress and surface subsidence curvature of overburden strata at different heights,the influence of the strata on the movement and deformation of overburden strata during the mining of different working face length was studied.The results show that when the mining distance is the same,with the increase of working face length,the average stress of overburden strata and the increase of surface subsidence decrease gradually. By comparing and predicting the disturbance of overburden strata by different working face lengths,it plays an important role in surface subsidence control,building protection and work safety production.