双洞盾构施工对邻近桩基础的影响研究

摘要

隧道开挖不可避免的会影响围岩的变形,从而对周围的既有基础及结构物产生复杂的影响,且多为不利影响.本文针对某市地铁区间盾构的设计及施工方案,运用有限元计算方法,分析了双洞盾构施工情况下,隧道开挖对邻近桩基础的影响规律,得到了桩基位移及内力变化的最不利时刻,进而寻找到在桩基最不利的位移及内力的变化特征,能够为类似的工程设计及施工提供参考.%Subway construction inevitably deforms the clay,as a result of established foundations and structures complicated impacted. According to the design and construction plans of a city, this paper uses finite element method to analysis the influence of the double-tunneling passing across the adjacent pile-foundation, and gets the worst-moment for placement and inner force of pile-foundation, and finds out the changes characteristics of worst placement and inner force of pile foundation. It must provide reference for the similar project design and construction.