摘要
归纳总结了隧道掘进围岩分类方法,提出了适合于大别山隧道围岩等级划分方法。根据实际监测资料,得出围岩等级与变形有三种相关关系:一是Ⅱ～Ⅲ级坚硬、完整围岩,其围岩变形主要呈光滑曲线;二是Ⅳ～Ⅴ级围岩,其变形呈"似根号"型曲线;三是软弱夹层、破碎带,其变形呈"厂"字型曲线。对于这几种变形曲线,其变形速率发生突变处,要加强监测,必要时启动应急预案,确保洞内安全。
In this paper, a classification method of rock mass for tunnel engineering in Dabiesan is summarized. Based on the monitored data, three different relationships between the Rock Mass Class and the tunnel deformation are obtained. First, hard and massive rock mass with a Class of Ⅱ～Ⅲ has a smooth deformation curve. The Class III--V rock mass has a deformation curve similar to the square root symbol. The weak and fractured rock mass has complete elastic-plastic perfect deformation characteristics. In tunnel excavation in these rock masses, if the deformation rate has a sudden change, more frequent monito- ring is necessary to ensure construction safety.
出处
《土工基础》
2012年第4期88-90,共3页
Soil Engineering and Foundation
关键词
公路隧道
围岩等级
变形
关联性
Highway Tunnels, Rock Mass Classifications, Tunnel Deformation, Correlations
