沿空留巷巷旁充填体对拉锚杆加固机理研究  被引量:15

Study on reinforcement mechanism of filling body in gob-side entry retaining

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作  者:陈勇[1] 杨玉贵[2] 闫帅[1] 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)

机构地区:[1]中国矿业大学煤炭资源与安全开采国家重点实验室,矿业工程学院,江苏徐州221116 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [3]蒙得利尔理工学院土木、地质和采矿工程系,加拿大魁北克H3C3A7

出  处:《采矿与安全工程学报》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)

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.

关 键 词:沿空留巷 充填体 对拉锚杆 大变形 加固机理 

分 类 号:TD353[矿业工程—矿井建设]

 

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