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针对苏州轻轨1号线盾构隧道区间施工情况,采用三维有限元数值计算模型,研究了盾构施工对侧边群桩变形的动态影响,结果表明:当盾构机切削面逐渐逼近群桩时,各单桩的隧道轴线处横向位移背离隧道,承台背离隧道发生倾斜;当盾构到达各单桩时,横向位移在隧道轴线处偏向隧道且为最大,承台发生了双向倾斜;当盾构逐渐远离群桩时,各单桩横向位移变化较小,承台的双向不均匀沉降减小。随着盾构的掘进,群桩整体沿着掘进方向移动,桩身沿隧道轴向位移在隧道轴线处达到最大。当群桩基础的桩底位于隧道轴线处和隧道轴线以上时,群桩承台仅仅发生偏向隧道的单向倾斜;当群桩基础的桩底位于隧道轴线以下时,群桩承台则产生了双向倾斜。
According to the construction of the shield tunnel of Suzhou Light Rail Line 1, the dynamic influence of shield construction on the deformation of the side groups pile was studied by using the three-dimensional finite element numerical model. The results show that when the shield face of shield machine gradually approaches the group pile , The lateral displacements of the single pile at the axis of the tunnel deviate from the tunnel, and the bearing platform inclines away from the tunnel. When the shield reaches each single pile, the lateral displacement is biased toward the tunnel at the tunnel axis and is maximum. When the structure is gradually away from the pile group, the lateral displacement of each pile is small, and the bi-directional non-uniform settlement of the pile cap decreases. As the shield tunneling progresses, the entire pile group moves along the direction of tunneling, and the axial displacement of the pile body along the tunnel reaches the maximum at the tunnel axis. When the pile foundation of the pile foundation is located at the tunnel axis and above the tunnel axis, the pile caps of the pile groups only incline to one side of the tunnel. When the bottom of pile foundation is below the tunnel axis, Bi-directional tilt.