摘要
为解决佛洼8号煤采区8309回风巷道施工中围岩变形问题,现场勘测研究了大断面巷道围岩变形破坏原因,据此对原支护方案支护参数进行了优化设计,即:采用注浆锚杆及高强度锚索,并对锚索施加高预紧力,钢带以纵横交错排列。并进行了现场试验。结果表明,巷道顶底板移近量为80 mm,两帮收敛量为32 mm,远小于允许变形量,且无异常离层现象发生,大断面巷道围岩变形得到有效控制。
In order to solve the surrounding rock deformation problem in 8309 return air roadway construction in Fowa No.8 coal mining area,the causes of peripheral rock deformation and damage in the large section roadway were studied through on-site investigation,accordingly,the support parameters of the original support scheme were optimally designed,i.e.:grouting anchor rods and high-strength anchor cables were used and high pre-tensioning force was exerted on the anchor cables,and the steel bands were arranged in a longitudinal and transversal manner.And the field test was carried out.The results show that the top and bottom plates of the roadway moved closer to 80mm,and the convergence of the two gangs was 32mm,which is much smaller than the permissible deformation,and there is no abnormal phenomenon of separation from the layer,so the deformation of the surrounding rock of the roadway with large cross section is effectively controlled.
作者
吕志伟
LV Zhiwei(Shanxi Xinjing Mining Coal Industry Limited Liability Company,Yangquan 045000,China)
出处
《煤矿现代化》
2024年第6期93-97,共5页
Coal Mine Modernization
关键词
大断面巷道
围岩变形
围岩控制
巷道支护
large section roadway
enclosed rock deformation
enclosed rock control
tunnel support
