中文摘要：

研究目的：在盾构施工过程中,盾构机与岩土体相互作用间具有强烈的耦合关系,如何通过仿真技术分析各因素对盾构施工过程中隧道受力和地表沉降的影响,是保障隧道施工安全的必要条件。本文以大连地铁202标段为例,对盾构开挖进行模拟,并结合工程实际地质情况和现场监测数据,进行三维仿真分析,研究其施工过程的影响因子及效应。研究结论：分析结果表明：（1）随着土舱压力的增大,地表沉降呈减小趋势,掌子面上的应力呈增大趋势,且塑性区范围增大;（2）注浆量增大,地表沉降减小,当注浆量过大时,破坏土体的自稳性,地表沉降变大;（3）盾构机在穿越不同土层时,地表变化是不同的,可根据模拟结果调整参数;（4）本研究成果可用于复杂环境下地铁盾构隧道的监测。

英文摘要：

Research purposes： In the shield construction, there is strong coupling in the interaction between shield machine and rock -soil mass, so the research on numerical simulation about the impact of various factors will become necessary. Combined with geological conditions and on -site monitoring data, the research on shield tunneling of 202 bid section of Dalian metro is carried out to analyze the influenting factors and effect of surface settlement by three dimensional finite element. Research conclusions：The following conclusions are proposed： （1） The surface settlement decreases with the increas- ing of the earth pressure, and the stress or plastic zone of tunnel face increases. （2） The surface settlement decreases with the increasing of grouting capacity, but excessive grouting capacity will destroy the self- stability of soil, which makes surface settlement increase. （3） When shield machines cross the different soil layers, the parameters can be ad- justed according to simulation results. （4） The research results can monitor metro shield tunnel under the complicated environment.