国道214线青海通天河隧道变形应力分析

Deformation Stress Snalysis of Tongtian River Tunnel on No.214 National Highway

针对工程施工中的隧道地应力的力学进行了探究和分析,并探讨了隧道应力造成围岩变形的机理,对由于高地应力使隧道在施工过程中出现较大的变形现象进行了详细分析。介绍了隧道大变形形成原理,对地形突变点及特殊层面进行详细的研究,确定了大变形地段可靠、操作性强的支护办法。以共玉二级公路通天河隧道为例,详细的介绍了应对隧道地应力特点的有效的施工措施和技术对策等,可确保隧道施工的安全性。通天河隧道地应力的施工实践给隧道高地应力区域的施工了有意义和有价值的技术经验,可供类似的隧道工程借鉴。

Combing with research and analysis on tunnel geostress in engineering construction,through discussion on rock deformation mechanism of tunnel,the large deformation caused by high geostress during tunnel construction is analyzed. Meanwhile,the formation principles of large deformation of tunnels are introduced,and the abrupt varying topography and special layer of rock are studied,which determines the reliable supporting method for large deformation. In this paper,combining with Tongtian River Tunnel on the second- class highway from Gonghe to Yushu,effective measures coping with tunnel geostress are introduced,which ensures the safety of tunnel construction. And the construction practice of tunnel geostress of Tongtian River Tunnel has significance to tunnel high geostress construction and provides preference to similar tunnel projects.