地铁车站端头井围护结构施工状态的数值分析

针对某地铁车站端头井围护结构,采用弹性地基杆系有限元计算模型和荷载总量法理论,用通用程序ALGOR,分析计算车站端头井围护结构在基坑开挖、回筑阶段每一工况的内力和变形,计算结果显示:①开挖阶段,围护结构最大变形发生在开挖面附近,支撑轴力随基坑开挖深度增加而增大;②回筑阶段,围护结构变形变化较小,随着支撑拆除,剩余支撑轴力逐步增大;③在围护结构施工过程中,其开挖侧最大弯矩出现在开挖阶段,迎土侧最大弯矩出现在回筑阶段,各道支撑最大轴力出现在回筑阶段。

Numerical Simulation Analysis on Construction States of Retaining Structure of End Well for Metro Station

This paper, in the light of the retaining structure of end well for some Metro station, puts forward a method by use of finite element model of elastic bar system and theory of total load method to analyze the inner force and deformation of the retaining structure of end well during each step of the excavation and reconstruction stage by using the common program ALGOR. The calculation results show that, (1) during excavation, the biggest deformation of the retaining structure occurs near the excavation face, and the axial force of supports become bigger as the excavation depth of foundation pit enlarges, (2) during reconstruction, the change of the retaining structure deformation is little, and the axial force of remain supports enlarges as the partial supports are removed, (3) during retaining structure's construction, the biggest moment of the retaining structure on the excavation side occurs at the excavation stage, the biggest moment of the retaining structure on the soil side occurs at the reconstruction stage, and the biggest axial force of every supports occurs at the reconstruction stage.