软岩地区浅埋偏压大跨度隧道洞口施工技术  

Construction Technique to Shallow and Unsymmetrical Large-span Tunnel near Portal in Soft Rock

作　　者：陈国强[1] 

机构地区：[1]杭州市公路管理局,杭州310004

出　　处：《地下空间与工程学报》2007年第z2期1448-1450,1463,共4页Chinese Journal of Underground Space and Engineering

摘　　要：软岩地区浅埋偏压大跨度隧道进口段极易塌方。介绍了某高速公路类似隧道的施工对策,采用地表加固,管棚和小导管超前支护施工相结合的施工方法,同时对隧道进行及时监控,合理安排施工工序,有效地保证了隧道进洞段的施工安全。It is easily collapsed for shallow and unsymmetrical large-span tunnel near portal in soft rock. This paper introduced the construction technique of the typical type of tunnel in Hangxinjing highway project, which combining the ground improving, pipe roofing and ductule advanced supporting. The construction procedures are carefully arranged according to prompt back analysis of observation datum. It proved successful in tunnel near portal.

关 键 词：大跨度隧道 浅埋偏压 施工 监控 

分 类 号：U455[建筑科学—桥梁与隧道工程]