地铁区间下穿既有地铁车站结构安全力学分析

介绍北京地铁某新建线区间下穿既有地铁车站的安全力学分析。为保证既有地下铁道的正常运营和既有地下结构的安全,需严格控制新建结构施工引起的地层位移。本文预测新建线施工引起的既有车站结构的沉降曲线、评估新建施工引起的既有车站沉降变形对其现状结构的影响,同时根据行车安全的要求,综合各种影响因素,提出新建线施工时既有车站结构的沉降控制指标。本文通过建立有限元模型计算并分析新建线区间下穿既有车站结构情况下既有车站结构的受力特征,并评价结构的安全性,为采取合理的施工辅助措施提供参考。

Mechanical and Security Evaluation of the Existing Metro Station Structure under Construction of Through Tunnel of New Metro Line

This paper introduces security evaluation when a tunnel of a New Metro Line goes through an existing Metro station structure. Stratum displacement caused by neco-line tunnel construction should be controlled strictly so as to keep the normal operation of the existing Metro line and guarantee the security of the existing station structure. This paper forecasts the settlement curve of the existing station structure and evaluates the influence of the excavated tunnel. The control target of settlement according to the requirements of train opera- tion safety and in view of comprehensive influencing factors. The finite-element model is established to calculate and analyze the stressed features and security conditions of the existing Metro station structure under through tunnel construction. This provides references for adopting reasonable assistant measures in construction.