盾构隧道下穿黄河施工对已建桥梁基础的影响模拟

Impact Simulation of Shield Tunnel Construction Crossing under the Existing Bridge Foundation on the Yellow River

为研究兰州轨道交通1号线迎门滩马滩区间盾构隧道近距离穿越银滩黄河大桥对桥梁桩基的影响,采用有限元计算方法对盾构下穿黄河施工进行动态模拟,并从地表沉降、桥梁桩基位移、内力变化等方面对其影响进行分析。经模拟结果与现场实际情况对比,两者吻合度较高。模拟方法可定量预测盾构掘进施工对已建桥梁基础的影响。

In order to study the impact of Yingmentan-Matan Section on Lanzhou rail transit Line 1 on the Yellow River Bridge where the shield tunnel construction crosses under the bridge pile foundation, the finite element calculation method is used to simulate the shield tunnel construction underneath the Yellow River,and the impacts of construction are analyzed from aspects of ground settlement,bridge pile foundation displacement and internal force changes. The simulated results coincide with the practical conditions,showing that the simulation method could quantitatively predict the impact of shield tunnel construction on the pile foundation of existing bridges.