新建变截面隧道下穿既有车站施工力学行为分析

新建浅埋地铁区间隧道下穿既有线路相关建筑时的施工力学行为十分特殊，在隧道施工过程中围岩产生扰动，引起地层变形，从而对既有线路相关建筑产生影响，施工过程存在着较大的风险。依托相关工程，为保证施工及既有建筑的安全，通过数值模拟，建立6号线体育馆站—通新岭站区间隧道下穿3号线通新岭站“全暗挖”施工过程有限差分模型，分析变截面全暗挖法通过3号线通新岭站时，6号线区间隧道对其造成的影响。

Analysis on Construction Mechanical Behavior of Newly-built Variable Cross-Section Tunnel underneath Passing Existing Station

The construction mechanical behavior of newly-built shallow buried tunnel underneath passing existing line buildings is very special. There is a huge risk in the construction process as the surrounding rock disturbance during tunnel construction and cause formation deformation, which influences existing line-related buildings. Based on relevant projects, this paper established shallow excavation finite element difference model to ensure the safety of construction and existing buildings through numerical simulation. This model is about Line 6 tunnel from Stadium Station-Tongxinling Station underneath passing Line 3 Tongxinling Station. With this model, this paper analyzed the influence of line 6 on the shallow excavation construction of line 3 passing Tongxinling Station.