为了研究交叠隧道不同交角下后建隧道盾构施工对地表及既有隧道围岩的影响，建立三维弹塑性有限元模型进行非线性静力应力应变分析。结果表明： 地表沉降等值线形状与叠交隧道平面投影类似；随着交角变大，交叠处既有隧道拱顶（仰拱）沉降逐渐变小，但变化量不大； 交角为15°~45°时，既有隧道围岩变形沿轴线的变化率增大。研究成果可为今后交叠隧道线路规划和设计的优化提供参考，同时为优化盾构施工参数，有效进行施工过程控制，保证科学合理、安全优质地完成隧道施工提供借鉴。

A 3D elasticplastic finite element model is established and nonlinear static stress and strain analysis is made so as to analyze the influence of the construction of the overlapping tunnel on the ground surface and surrounding rocks of the existing tunnel under different intersection angles. Conclusions drawn are as follows: The shape of the contour of the ground surface settlement is similar to the projection of the overlapping tunnel; As the intersection angle increases, the crown (invert) settlement of the existing tunnel at the overlapping point reduces gradually, however the change value is small; When the intersection angle ranges from 15° to 45°, the change rate of the deformation of the surrounding rock of the existing tunnel along the tunnel axis increases. The research results not only can provide reference for the plan and design of similar overlapping tunnels in the future, but also can provide reference for the optimizing of the shield boring parameters so as to achieve scientific, rational, safe and highquality tunneling.