CAJ | 학술논문

工作面上覆硬厚岩浆岩大范围运移可能诱发冲击地压、煤与瓦斯突出等动力灾害,且易导致地表突然下沉。以某煤矿首采工作面为背景,对巨厚岩浆岩下垮落法与充填法开采进行了离散元数值模拟,分析了充填开采对岩浆岩运移与采动应力的控制效果。研究表明：垮落法开采时,岩浆岩初次运动前支承压力迅速增加,最大峰值达到45．97 MPa,易引起冲击地压等动力灾害；初次运动后上部岩层发生同步运移,下沉速度显著增大,最大下沉量达1．21 m。充填法开采时,支承压力变化不大,最大峰值为25．88 MPa；与垮落法相同推进步距时,岩浆岩上覆岩层下沉量仅为0．0444 m。充填法开采有效降低了围岩应力和地表下沉,降低了动力灾害的危险程度。
공작면상복경후암장암대범위운이가능유발충격지압、매여와사돌출등동력재해,차역도치지표돌연하침。이모매광수채공작면위배경,대거후암장암하과락법여충전법개채진행료리산원수치모의,분석료충전개채대암장암운이여채동응력적공제효과。연구표명：과락법개채시,암장암초차운동전지승압력신속증가,최대봉치체도45．97 MPa,역인기충격지압등동력재해；초차운동후상부암층발생동보운이,하침속도현저증대,최대하침량체1．21 m。충전법개채시,지승압력변화불대,최대봉치위25．88 MPa；여과락법상동추진보거시,암장암상복암층하침량부위0．0444 m。충전법개채유효강저료위암응력화지표하침,강저료동력재해적위험정도。
Large-scale migration of hard thick magmatic rocks of overlaying rocks at working surface may induce dynamic disasters as rock burst and outburst of coal and gas. It can easily lead to sudden subsidence of the surface. Taking the first min-ing face of a coal mine as the background,discrete element numerical simulation on mining caving method and filling method for supper-thick magmatic rocks are carried out to analyze the effect of filling on migration of magmatic rocks and mining stress. Research shows that by the caving method,the abutment pressure at first migration of magmatic rocks increases rapidly, with the maximum peak at 45. 97 MPa,which may easily induce the dynamic disasters as rock-burst. Upper rocks moves syn-chronously with the first migration,and the subsidence rate significantly increases with maximum subsidence of 1. 21 m. By backfill mining method,the abutment pressure change less,with maximum peak at 25. 88 MPa. Compared with the caving meth-od and at the same advancement,overlying strata subsidence of magmatic rocks is only 0. 044 4 m. Thus the backfill mining method can effectively reduce the stress of surrounding rock and the surface subsidence,and lower the risk of the dynamic dis-asters.