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为了分析偏压条件下隧道不同施工方法对既有桥墩桩基稳定性的影响,以深圳市在建葵坝路隧道下穿高速公路桥梁段施工作为工程背景,采用有限差分软件FLAC3D对该隧道在3种不同施工方法作用下的施工过程进行了数值模拟。通过分析隧道围岩的应力和位移的分布特征以及桥墩桩基的变形方式和位移大小,比较了不同施工方法对桥墩桩基稳定性影响的大小。分析结果表明:顶弧侧壁法能够更好地控制桥桩位移和地表沉降,CD法次之,而台阶法最差。
In order to analyze the influence of different tunnel construction methods on the stability of existing bridge pier under the bias conditions, taking the construction of the bridge section of the expressway under the tunnel of Jiankuiba in Shenzhen as the engineering background, the finite difference software FLAC3D Three different construction methods under the action of the construction process were numerically simulated. By analyzing the distribution of stress and displacement of tunnel surrounding rock and the deformation mode and displacement of pile foundation, the influence of different construction methods on the stability of pile pier foundation is compared. The results show that the top arc side wall method can better control the displacement and surface settlement of the bridge pile, the CD method is the second, and the step method is the worst.