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采用有限元强度折减法,对某浅埋连拱隧道洞口边坡进行稳定性分析,并将结果与工程实际进行对比,证明用有限元强度折减法进行边坡稳定性分析的合理性。同时指出,对于浅埋连拱隧道洞口施工,尤其是后行洞施工会对边坡稳定性造成不利影响,即使边坡安全系数符合规范要求,也有必要对洞口段边坡进行加固处理,提高强度储备安全系数。对于隧道施工与边坡的相互作用机理,本文没有探讨,有待继续深入研究。
By means of finite element strength reduction method, the stability analysis of the slope of a tunnel with a shallow buried multi-arch tunnel is carried out. The results are contrasted with the engineering practice. It is proved that the slope stability analysis is reasonable by the finite element strength reduction method. At the same time, it is pointed out that for the construction of shallow-buried multi-arch tunnel openings, especially the construction of the after-going tunnels, the slope stability will be adversely affected. Even if the slope safety coefficient meets the requirements of the codes, it is necessary to reinforce the slope of the tunnel sections to enhance the strength Reserve safety factor. For the tunnel construction and slope interaction mechanism, this article does not discuss, pending further study.