摘要
某铜矿深部高应力不良岩层蠕变变形控制难度大和维护成本高,为降低巷道支护成本,本文分析深部巷道围岩变形破坏特征以及影响因素,针对“喷锚+U型钢架+锚注(SUG)”联合支护巷道变形量大、维护成本高的问题,开展了“喷锚+钢管梁支架+锚注(SSG)”联合支护研究。在确定联合支护结构参数的基础上采用FLAC有限差分分析软件,进行SUG和SSG支护巷道围岩数值模拟与分析。结果表明:SUG和SSG支护巷道围岩最大变形分别为38.6 mm和25.7 mm,后者比前者支护围岩最大变形降低33%。相同条件下长50 m巷道,SUG和SSG支护与两年内返修成本分别为155万元和80万元,后者比前者降低48%。在该矿区1 000 m中段不良地层开展SSG支护巷道的现场试验,并进行长达3~5年的变形监测。结果显示,SSG支护巷道的稳定性好、安全性强和性价比高,完全满足高应力不良岩层巷道蠕变变形控制要求,在该矿区深部不良岩层巷道支护与返修工程中得到推广应用。
It is difficult to control the creep deformation of high stress poor roadway in a copper mine and high maintenance cost.In order to reduce the cost of roadway support,this paper analyzes the deformation and failure characteristics of deep surrounding rock and the main influencing factors.Aiming at the problems of large deformation and high maintenance cost of shotcrete anchor+U shaped steel frame+anchor grouting(SUG)combined support,the combined support technology of shotcrete anchor+steel tube beam support+anchor grouting(SSG)is studied.Then,on the basis of determining the two supporting parameters,FLAC finite difference analysis software is used to carry out the numerical simulation of surrounding rock of SUG and SSG supporting roadway.The results show that the maximum deformation of SUG and SSG support rocks is 38.6 mm and 25.7 mm respectively,and the maximum deformation of latter is 33%lower than that of the former.Under the same conditions,the costs of SUG and SSG support and repair within two years of 50 m roadway are 1.55 million yuan and 0.8 million yuan respectively,and the latter is 48%lower than the former.At last,the site test of SSG support was carried out in the bad strata in the 1000 m middle section of mining area,and the deformation monitoring of supporting roadway is carried out for 3-5 years.The results show that SSG support roadway has good stability,strong security and high cost performance,which meets the requirements of creep deformation control of roadway in high stress poor strata,and has been popularized and applied in the construction of deep bad strata roadway in the copper mine.
作者
李志
张席芝
吴迪
LI Zhi;ZHANG Xizhi;WU Di
出处
《中国矿山工程》
2024年第5期16-21,27,共7页
China Mine Engineering
基金
国家自然科学基金项目(编号:52374110)资助。
