极弱胶结地层中大断面硐室开挖及支护技术研究  

Excavation and Supporting Technology for Large Cross-section Chamber in Weakly Cemented Strata

作　　者：冯伟 朱江 宋远卓 

机构地区：[1]华电电力科学研究院,浙江杭州310030 [2]杭州国电机械设计研究院有限公司,浙江杭州310030 [3]贵州乌江水电开发有限责任公司,贵州贵阳550002

出　　处：《矿冶工程》2015年第3期9-13,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金资助项目(50804046)

摘　　要：针对极弱胶结软岩强度低、胶结差、易风化、遇水泥化、难锚固的特性,在分析其变形破坏机理的基础上,提出了初次支护采用网喷+拱形支架、二次支护采用单层钢筋砌碹砼的复合支护方案。采用数值模拟研究了分步开挖对硐室稳定性的影响,并验证了该支护方案的可行性。现场监测结果进一步表明,该支护方案能满足极弱胶结地层中硐室支护的要求,对于极弱胶结地层中硐室施工具有一定借鉴意义。The weakly cemented strata is characterized by its low strength,poor cementation,problem of susceptibility to weathering and getting muddy,difficulty in anchoring. Based on the analysis of its deformation and breakage,a complex supporting scheme was proposed including an initial wire mesh-reinforced shotcrete plus arch support withⅠ-steel,and a secondary lining structure of single-layer of reinforced concrete. The feasibility of this scheme has been verified through the numerical simulation of the influence of excavation step-by-step on the chamber stability. The on-site monitoring results indicated that such supporting scheme can meet the supporting requirements for chambers in the weakly cemented strata,which is of certain significance for the chamber construction in the weakly-cemented strata.

关 键 词：极弱胶结软岩 大断面硐室 开挖 支护技术 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]