汕湛高速公路东岭隧道围岩分级评价

Rating Assessment on the Surrounding Rocks of Dongling Tunnel on Shanzhan Highway

汕湛高速公路东岭隧道为特长山岭隧道,单洞最大长度4 248 m,最大埋深超过300 m,隧道长度在广东省高速公路中排名第三,地质条件复杂。通过运用工程地质调绘、钻探、物探、水文地质试验、室内试验和现场抽水试验、地应力测试等综合勘察方法,查明了隧道围岩级别,在此基础上计算出围岩基本质量指标BQ及修正值[BQ],详细划分了隧道围岩级别。

The Dongling tunnel of Shanzhan Highway is an extra long mountain tunnel with the single tunnel being4248m and the buried depth being 300m. It is the third longest tunnel among highways in Guangdong, which is ofcomplicated geographical conditions. In order to identify the level of the tunnel surrounding rocks, comprehensive investigationmethods were taken, including engineering-geological investigation and depiction, drilling, geophysicalexploration, and hydrographic geological experiment, etc..