黄土连拱隧道中导洞临时支护的比选分析  

Comparison and Analysis of Temporary Support Schemes for the Middle Pilot Heading in a Multi-Arch Loess Tunnel

作　　者：余元全 刘小琳[2] 张学富[2] 

机构地区：[1]北京城建设计发展集团股份有限公司,北京100037 [2]重庆交通大学土木建筑学院,重庆400074

出　　处：《现代隧道技术》2014年第1期138-143,共6页Modern Tunnelling Technology

摘　　要：黄土连拱隧道采用台阶法开挖时,中导洞的临时支护一般为钢支撑支护和回填土支护。为了选择合理的临时支护,文章结合太佳高速公路清凉寺连拱隧道的工程实例,对两种支护进行全过程弹塑性数值仿真对比分析。结果表明,钢支撑支护与回填土支护对隧道的地表位移、拱顶沉降、锚杆轴力的支护效果相同,均能满足隧道变形要求;对围岩应力、初期支护应力和锚杆轴力等方面的支护效果,钢支撑支护优于回填土支护。When the bench method is used for the excavation of a multi-arch loess tunnel, steel rib support and backfill support are commonly used for the temporary support of the middle pilot heading. Using the Qingliangsi multi-arch tunnel on the Taiyuan-Jiaxian Expressway as an example, a comparative analysis of overall elastic-plastic simulation was carried out for those two kinds of supporting methods in order to select the most logical temporary support. The results show that the steel rib and backfill supporting methods have the same supporting effects on the surface displacement, crown settlement, and bolt axial force , and both of them can meet the requirements for tunnel deformation. However, the support provided by steel ribs in terms of the surrounding rock stress, initial support stress, and bolt axial force is better than that provided by the backfill support.

关 键 词：黄土连拱隧道 台阶法施工 支护比选 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]