摘要
以武汉地铁岩溶专项勘察资料和地铁工程中岩溶处理案例为依据,采用综合统计方法分析岩溶发育特征和规律,总结地铁车站、区间隧道穿越岩溶区时的处理方法。研究表明武汉地区岩溶为浅层岩溶,主要在岩面以下0-15 m范围发育,表现为溶洞、溶沟、溶槽,钻孔遇洞率约50%,线岩溶率约6%,溶洞埋置越深填充率越低。岩溶区主要分为Ⅰ,Ⅱ,Ⅲ3种地质结构类型并对应高、中、低3种岩溶塌陷风险区。根据岩溶地质结构类型分类总结武汉地铁建设中采取的注浆填充、岩层注浆帷幕、土层隔离、旋喷加固及围护结构入岩等处理措施。
The features and pattern of karst development in Wuhan area are analyzed on the basis of the karst investigation data and the karst encountered in the construction of Wuhan Metro. The treatment methods for the karst encountered in the construction of Wuhan Metro are also summarized. Conclusions drawn are as follows：1） The karst in Wuhan area belongs to shallow karst, which develops mainly within the scope of 0-15 m below the rock surface;2 ） The karst in Wuhan area takes the shape of karst caves, karst channels and karst troughs;3 ） The rate of karst cave encountering in borehole drilling is about 50%, and the rate of linear karst is about 6%;4） The deeper the karst caves, the smaller the karst cave filling rate;5） The karst can be classified into 3 geological structural types, i. e. , Type I, Type Ⅱ and Type Ⅲ, which correspond to 3 karst subsidence risk zones, i. e. , high karst subsidence risk zone, medium karst subsidence risk zone and low karst subsidence risk zone;6） Countermeasures, including karst cave filling by grouting, grouting curtain installed in rocks, isolation of soil layers, reinforcement by jet-grouting piles and extending the retaining structures into the rock, are taken to cope with the karst encountered in the construction of Wuhan Metro.
出处
《隧道建设》
北大核心
2015年第5期449-454,共6页
Tunnel Construction
关键词
岩溶发育特征
地质结构
地铁工程
岩溶处理
karst development feature
geological structure
Metro works
karst treatment
