煤矿安全2019，Vol.50Issue(2)：223-227,5.DOI:10.13347/j.cnki.mkaq.2019.02.052
正断层煤层开挖煤岩体的力学特性研究
Research on Mechanical Characteristics of Coal and Rock Mass in Coal Seam Excavation of Normal Fault
摘要
Abstract
In order to study mechanical characteristics of coal and rock mass in coal seam excavation of normal fault, through establishing the mechanical model of coal and rock mass excavation in the vicinity of the normal fault, using FLAC3D numerical calculation, we theoretically analyzed the coal and rock mass mechanical properties during excavation of upper and lower plates. The results show that horizontal displacement and horizontal stress have little effect on the excavation of the top rock mass of the coal seam. The vertical displacement caused by the ground stress and the considerable stress at the excavation top are the main factors causing collapse of the roof and the top of the excavated rock mass. When there is a normal fault, the considerable stress and vertical displacement caused by excavation from the upper plate is smaller than that caused by excavation from the lower plate. The closer the excavation area is to the fault, the greater the corresponding stress and vertical displacement at the top of excavation is. Under the same conditions, it is safer to excavate from the upper plate than from the lower plate. Therefore, in the actual project, the excavation of the coal seam from the lower plate should be avoided as far as possible so as to reduce the potential safety hazards.关键词
正断层/上盘/下盘/竖向位移/相当应力/力学特性Key words
normal fault/upper plate/lower plate/vertical displacement/corresponding stress/mechanical characteristic分类
矿业与冶金引用本文复制引用
周勇,程建圣,张占国,冀超辉..正断层煤层开挖煤岩体的力学特性研究[J].煤矿安全,2019,50(2):223-227,5.基金项目
国家自然科学基金资助项目(50774077) （50774077）
2014年度山西省煤基重点科技攻关资助项目(MI2014-12) （MI2014-12）
