【摘要】 为研究交叠盾构隧道施工对并行高架桥群桩的变形影响，进行有限元模拟计算，并对比实测数据验证，计算结果表明：在双线施工完成后，桩顶为最大水平位移处，桩身朝向隧道的水平位移呈“上下双S型曲线”,在下洞隧道上下2D深度内的桩身挠曲变形共产生4个水平位移极值点，且前排桩对于水平位移阻隔作用较小。在此基础上研究了不同隧道与群桩、交叠隧道净距的工况下，前排桩桩身水平位移的变化及不同注浆压力对水平位移的控制效果：隧道-桩的净距与桩顶水平位移呈正相关，与桩身上部水平位移极大值呈负相关，当净距小于等于4m时，桩身上部水平位移极大值大于桩顶位移值；改变交叠隧道净距时，桩顶仍为水平位移最大处并且位移值与净距呈负相关，当净距较小时，减小下洞注浆压力，增加上洞注浆压力，控制桩顶最大水平位移的效果较好。更多还原

【Abstract】 In order to study the influence of overlapping shield tunnel construction on the deformation of pile groups of parallel viaduct, the finite element simulation calculation is carried out and verified by comparing the measured data. The calculation results show that: after the completion of double track construction, the pile top is at the maximum horizontal displacement, and the horizontal displacement of the pile body towards the tunnel presents an "up-down double S-shaped curve", and the deflection deformation of the pile body within the 2D depth of the lower tunnel produces a total of 4 extreme points of horizontal displacement, and the front row piles have little barrier effect on horizontal displacement. On this basis, the variation of the horizontal displacement of the pile body in the front row and the control effect of different grouting pressure on the horizontal displacement under the working conditions of different tunnel, pile group and overlapping tunnel net distance are studied: The net distance between tunnel and pile is positively correlated with the horizontal displacement of the pile top, and negatively correlated with the maximum horizontal displacement of the upper part of the pile body. When the net distance is less than or equal to 4m, the maximum horizontal displacement of the upper part of the pile body is greater than the displacement of the pile top; When the net distance of overlapping tunnels is changed, the pile top is still at the maximum horizontal displacement and the displacement value is negatively correlated with the net distance. When the net distance is small, the effect of controlling the maximum horizontal displacement of the pile top is better by reducing the grouting pressure of the lower tunnel and increasing the grouting pressure of the upper tunnel.更多还原