浅埋大跨度隧道施工阶段临时支护安全性分析

针对目前国内采用CRD法修建隧道施工过程中对临时中隔壁的安全性研究很少,结合某浅埋大跨度隧道对中隔壁采用现场监测和数值模拟两种手段做了对比分析,两种方法所得结果吻合良好。研究结果表明,在CRD1,3部超前和CRD1,2部超前的情况下,中隔壁上部的水平位移都明显大于下部,但结构安全系数相差不大。以上研究为隧道的信息化施工提供了依据,也为今后的相关工程积累了经验。

Analysis of security of temporary supports in shallow-depth large-span tunnel

In view of the lacked study on security of temporary supports on domestic tunnelling construction by CRD method at present,we have employed two ways,in-situ monitoring and numerical simulation,in the phase of a tunnel.The results turned out to be perfectly matched by comparison and analysis.The research indicates that horizontal displacement of upside is obviously higher than downside's whether CRD1,3 keeps ahead or CRD1,2 keeps ahead,and safety factor of temporary supports is basically the same.As a result...