厦成高速某隧道围岩分级

隧道围岩分级是正确进行隧道设计与施工的基础。厦成高速某隧道横贯五盖山南端,地质条件复杂,通过运用多种勘探手段,综合分析取得较符合工程实际的地质参数,采用《公路隧道设计规范》(JTGD70-2004)围岩分级方法,根据岩石坚硬程度、岩体完整程度两个基本因素,进行初步分级,再从隧道围岩地下水状态、高初始应力、不利的软弱结构面3个影响因素进行修正,最后详细分级,为隧道结构设计与施工提供合理参数。

A tunnel wall rock classification of the Xiamen-Chengdu highway

The classification of the tunnel wall rock is the foundation of carrying out the tunnel design and construction correctly. A tunnel of the Xiamen-Chengdu highway traverses the south tip of the Wugai moun-tain, the geology of tunnel is very complex. Through exerting many exploration measures and the synthetical analysis, it has gained some geology parameters according with the project practice. Firstly, this paper adopts the wall rock classification method of"highway tunnel design criterion"(JTG D70-2004)to carry through the primary classification according to two basic factors of rock rigidity degree and rock body integrity degree. Then, it carries on the classification revision from the groundwater state, high virgin stress and bad weak structural plane of the tunnel wall rock. Lastly, it carries through the detailed classification to provide the reasonable parameters for tunnel structure design and construction.