摘要
针对高水材料巷旁充填沿空留巷充填体大变形的问题,通过建立沿空留巷巷旁充填体加固力学模型和基于UDEC 6.0 Trigon网格划分方法的数值模型,得到对拉锚杆、钢筋网等构件对充填体的加固机理,表现为“三大两小”:随着充填体的压缩变形,加固构件对其围压增大,充填体内垂直应力集中面积增大,最大承载能力增大20.3%,两帮变形及顶底角鼓包减小,内部错动开裂减小;对拉锚杆和钢筋网的加固作用在充填体大变形情况下尤为明显,使其更好地适应巷道围岩剧烈变形。
In order to solve the large deformation of backfill body with high water material in gob-side entry retaining, the backfill body reinforcement mechanics model and numerical model using UDEC 6.0 Trigon mesh method are established. The reinforcement mechanism of two-side pull cable, bar-mat reinforcement, etc. is obtained, which display three-increase and two-decrease. With the compressive deformation of backfill body, the confining pressure caused by strengthening members increases, the concentration area of vertical stress in backfill body increases, the maximum bearing capacity increases by 20.3%, while the deformation of ribs and bumps nearby corner angles decreases, faulting and cracking in backfill body decrease. The reinforcement function is particularly apparent when the backfill body faces large strain, which makes the backfill body meet the large deformation of roadway better.
作者
陈勇
杨玉贵
闫帅
郝胜鹏
曹其嘉
CHEN Yong;YANG Yugui;YAN Shuai;HAO Shengpeng;CAO Qijia(State Key Laboratory of Coal Resources and Safe Mining,School of Mines,China University of Mining &Technology,Xuzhou,Jiangsu221116,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining &Technology,Xuzhou,Jiangsu221116,China;Department of Civil,Geological and Mining Engineering,Polytechnique Montreal,Quebec H3C 3A7,Canada)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2018年第6期1129-1134,共6页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51504246)
关键词
沿空留巷
充填体
对拉锚杆
大变形
加固机理
gob-side entry retaining
backfill body
two-side pull cable
large deformation
reinforcement mechanism
