边坡影响下连拱隧道施工方案优化分析

Optimization Analysis of Construction Scheme for Twin Tunnel Under Slope

随着我国公路隧道建设的发展,连拱隧道也越来越多。连拱隧道一般应用于中短隧道,常常与边坡结合在一起,同时连拱隧道施工过程非常复杂,不同的施工方案带来不同的力学行为,故有必要对连拱隧道在施工方案进行优化分析,尤其是在边坡影响的情况下。文章建立了连拱隧道施工动态有限元模型,分别模拟先开挖边坡外侧和先开挖内侧隧道的施工过程,并通过对中墙应力、围岩稳定性的比较,分析了边坡影响下两种施工方案的优劣。

With the rapid development of highway construction, there appear more and more twin tunnels. The twin tunnel is usually applied for middle or short length tunnel, and it is usually combined with slope. But the construction process of twin tunnel is very complex, and the different construction schemes will cause obviously different mechanical behavior, so it is necessary to make optimization analysis of construction schemes for twin tunnel, especially in ease under slope action. Two finite element analysis models are established, which can simulate the construction process. The settlement of crown, stress of the middlewall and the stability of the surrounding rock are analyzed and compared, then the advantages of these two methods are compared and the practical construction scheme is optimized.