森林公园地铁车站深基坑变形规律有限元分析

FEM analysis of the deformation laws of deep excavation of Senlin Park Subway Station

以北京地铁奥运支线森林公园车站南基坑为工程背景,采用有限元法研究了影响地铁深基坑围护结构变形的主要因素,预测了围护结构的变形,完成了监测方案设计,进行了深基坑变形规律现场监测研究。结果表明,森林公园车站南坑基坑围护结构监测方案可行,有限元计算得到的桩体水平位移与现场监测结果基本一致,建议的采用分层分小块的基坑土方开挖法是减小时空效应的有效施工方法,钢支撑对减小围护结构变形和弯矩十分有利。

Based on the southern pit of Senlin Park Station of Beijing Olympic Subway branch,FEM is used to study the main factors of deep excavation of subway station maintenance structure distortion,forecast the distortion of maintenance structure,complete the design of monitor project,study carry through the in-situ monitoring study of deep excavation distortion law. The results are as follows:the project of monitor of the southem pit of Senlin Park Station is practicable;the FEM calculation results of horizontal displacement of pile agrees with the in-situ monitoring results;the instance excavation method of separated layer and little portion excavation is effective to reduce space-time effect during the construction process;the steel pile brace is useful to reduce the deformation and moment of maintenance structure.