摘要
露天矿端帮压煤造成资源浪费,采用充填方法可提高煤炭资源采出率。基于鄂尔多斯市某露天矿端帮压煤条件,建立端帮压煤充填开采的连续介质力学模型,给出了充填前后煤柱应力计算公式,采用Bieniawski和八面体强度理论计算得到充填前后煤柱留设尺寸最小分别为4.28、3.23 m,并利用FLAC3D数值模拟软件研究了开采进尺、煤柱宽度和充实率等因素对煤柱稳定性的影响。结果表明:开采进尺、煤柱尺寸和充实率分别达到4、5 m和90%,可保证煤柱稳定性。
Under-slope coal in open-pit mines cause resource waste, and the use of filling methods can increase the recovery rate of coal resources. Based on the conditions in an open-pit mine in Dongsheng Shendong mining area, a continuous medium mechanical model for under-slope coal filling mining is established, and the formula for calculating the stress of coal pillars before and after filling is given. Using Bieniawski and octahedral strength theory to calculate the minimum width of coal pillars,it before and after filling is 4.28 m and 3.23 m, respectively. And using FLAC3D numerical simulation software to study the influence of factors such as excavation dimension, coal pillar width and compression ratio on the stability of coal pillars, the results show that when the excavation dimension,coal pillar size and compression ratio are 4 m, 5 m and 90% respectively can ensure the stability of coal pillars.
作者
安泰龙
王栋
AN Tai-long;WANG Dong(Energy Bureau of Inner Mongolia Autonomous Region,Hohhot 010098,China;School of Mines,China University of Mining and Technology,Xuzhou 221116,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China)
出处
《煤炭技术》
CAS
北大核心
2021年第9期42-46,共5页
Coal Technology
关键词
端帮压煤
充填开采
煤柱稳定性
under-slope coal
backfill mining
stability of coal pillar
