2011年4月上 施工技术 第40卷第338期 CONSTRUCTION TECHNOLOGY 61 大跨径隧道双上侧壁导坑法施工技术 肖营，胡伦炜 (深圳市建设（集团）有限公司.广东深圳518001) [摘要]大跨径隧道双上侧壁导坑法是根据隧道软硬围岩相间的情况，将双侧壁导坑法与上下台阶法相结合的一 种技术.以开挖断面的起拱线为界，将隧道横断面分为上下两部分，上部采取双侧壁导坑法施工，下部分左右幅先 后开挖，适用于上部围岩较差、下部围岩较好的单向三车道及三车道以上隧道.详细介绍了润身超前支护、漏身开 挖、洞身初期支护与临时支护的施工方法与注意事项.工程应用结果表明，与传统的双侧壁导坑法相比，该方法安 全可靠、灵活多变、经济社会效益明显. [关键词]大跨径隧道；双上侧壁导坑；软硬围岩；起拱线 [中图分类号]U459.2 [文献标识码]A [文章编号]1002-8498(2011)07-0061-03 Construction Technology of Two Upper Side-wall Pilot Tunnel Method for Large-span Tunnels Xiao Ying Hu Lunwei Shenzhen Construction Group)Co.Led.Shenzhen Guangdong 518001 China) Abstract:Based on the condition of weak and hard surrounding rock interphase construction technology of two upper side-wall pilot tunnel is a new technology bined with both side heading method and benching tunneling construction method.The tunnel is divided into a upper part and a lower part with the springing line of excavation cross-section.The upper part is constructed with both side heading method and the lower part is excavated in succession from left to right.This technology is suitable for one-way tunnel with three lanes or more in which the upper surrounding rock is poor and the lower is good.The engineering result shows that pared with traditional two side heading method this construction technology is safe and flexible and makes a fine social and economic benefits. Key words:large-span tunnel;two upper side-wall pilot tunnel;weak and hard surrounding rock; springing line 1技术原理及适用范围 界线将隧...
大跨径隧道双上侧壁导坑法施工技术.pdf
