摘要
通过运用相似模拟实验和FLAC3D数值模拟对我国北方由于黄土覆盖区域下的煤层开采造成的地表沉陷进行研究。数值模拟实验研究得出:由于煤层开采时受开采推力和上覆岩层自重的影响,位于采空区上部的覆岩会不断发生向采空区方向的垮落,在覆岩垮落达到一定程度时会逐步使地表发生沉降,且沉降是随采掘长度不断增加而加大。相似模拟实验研究得出:工作面向前推进时,位于采空区上方的顶板发生初次垮落长度为280mm(56m),来压长度210mm(42m),垮落高度16mm(3.2m),即初次来压。相似模拟实验中,在水平推力和开采扰动的影响下,黄土覆盖地表沉降和数值模拟基本相似,当开采终止后,其最大沉降值为36.48mm(7.296m),共发生9次来压,平均来压步距为131mm(26.2m)。
Surface subsidence that induced by coal seam mining under loess coverage in northern China was analyzed by similar simulation and FLAC3 Dnumerical simulation. The results showed that as influenced by mining force and overlying rock self weight,overlying strata at upper of goaf would collapsed constantly to goaf direction,and then surface would appeared subsidence as overlying rock collapsed to some degree,and subsidence increased with mining length increased. The results of similar simulation experiment showed that as working face advanced to forward,the first roof collapse length of goaf was 280 mm（ 56 m）,weighting length was 210 mm（ 42 m）,collapse height was 16 mm（ 3. 2 m）,its mean the first weighting. In similar simulation experiment,under horizontal thrust and mining disturbance,surface subsidence of loess coverage was similar to numerical simulation results,as mining finished,the largest subsidence was 36. 48 mm（ 7. 296 m）,about nine weighting appeared in total,and average weighting distance was 131 mm（ 26. 2 m）.
作者
张磊
鲁杰
ZHANG Lei;LU Jie(School of Architecture and Surveying Engineering,Shanxi Datong University,Datong 037003,China;School of Coal Engineering,Shanxi Datong University,Datong 037003,China)
出处
《煤矿开采》
北大核心
2018年第4期58-61,共4页
Coal Mining Technology
基金
山西省科学技术发展计划(工业)项目(20140321003-05)
大同市科学技术发展计划项目(2016024)
关键词
黄土覆盖区
地表沉陷
开采扰动
数值模拟
相似模拟
loess coverage
surface subsidence
mining disturbance
numerical simulation
similar simulation
