特殊地形地质条件下的隧道衬砌结构安全性分析

Safety Analysis on Tunnel Lining Structure under Special Terrain and Geological Conditions

凤凰山隧道工程长龙隧道为上、下行分离的六车道高速公路隧道,因覆盖层薄,开挖过程洞口位置局部出现冒顶引起二次衬砌厚度局部不满足原设计要求。根据《公路隧道设计规范》(JTG D70-2004)的相关规定,结合地质勘查报告和支护结构设计情况,参考国内类似的成功经验,对该段衬砌结构进行安全性分析,明确衬砌结构安全系数是否符合规范要求;同时依据相关标准、规范,对隧道结构安全性进行分析。

The Changlong Tunnel of Fenghuangshan Tunnel Project is a six-lane expressway tunnel separated by the upper and lower sides. Because of thin cover layer,the top of the tunnel during the excavation process is partially exposed and the thickness of the secondary lining partially fails to meet the original design requirements. According to the relevant provisions of the ＂ JTG D70-2004 Highway Tunnel Design Specifications ＂,being combined with the geological survey report and the design of the support structure,and with reference of similar domestic successful experience,safety analysis on lining structure of this section has been carried out,it has been made certain that whether the lining structure safety coefficient could meet the requirements of the specifications; at the same time,the safety of the tunnel structure has been analyzed according to the relevant standards and specifications.