盾构隧道软土震陷有限元分析

软土地区震陷是造成工程结构震害的原因之一，其计算问题一直是目前国内外十分关注的问题。为了研究地铁隧道在软土地区中的震陷计算问题，以天津Z2线地铁隧道一期工程为例，结合地质勘察报告和地震安全评价性报告，采用《软土地区岩土工程勘察规程》（JGJ 83—2011）推荐的有限元分析计算方法并结合软化模量理论，进行地铁隧道软土震陷的分析计算，将计算结果与自由场情况下的计算结果进行对比分析。结果表明，地铁隧道位置处的震陷值大于相同位置处自由场情况下的震陷值，但二者数值相差不大，隧道的震陷值在一定程度上可以通过自由场的震陷值来进行估算；隧道震陷处理措施的范围可限制在隧道中心轴线左右两个隧道直径范围内。研究以期对于软土地区盾构隧道震陷问题具有一定参考价值。

Finite element analysis of seismic settlement of shield tunnel in soft soil

The seismic settlement in soft soil area is one of the main causes of earthquake damage, and its computational problem has always been a matter of great concern at home and abroad. In order to study the calculation of the seismic settlement of the subway tunnel in the soft soil area, taking the first phase project of the Tianjin Z2 subway tunnel as an example, combined with the geological survey report and the seismic safety evaluation report, the finite element analysis calculation method recommended by the “Geotechnical Investigation Procedures in Soft Soil Areas” (JGJ 83-2011) and the soft modulus theory is used to analyze and calculate the seismic settlement in soft soil area of the subway tunnel. The calculation results are compared with those of free field. The results show that the seismic settlement value at the location of the subway tunnel is larger than that under the free field at the same position, but there is little difference between the two values. The seismic settlement value of the tunnel can be estimated by the seismic settlement value of the free field. The scope of the tunnel seismic treatment can be limited to the diameter of the two tunnels around the central axis of the tunnel. The research has certain reference value for the similar subway tunnel projects in soft area.