北京地铁王府井站西南风道施工效应三维有限元分析

Three-dimension Analysis of the Construction Effects of the Southwest Air Duct at the Wangfujing Station of Beijing Tube

北京地铁“复-八”线王府井站西南风道紧邻建筑物,施工场地狭窄,采用浅埋暗挖法施工。由于风道结构断面大、净空高,埋深浅,处于松散含水地层,地下水位高,施工条件恶劣,致使施工极其困难。为了确保施工安全,根据三维有限元分析理论,对风道施工方案进行计算施工效应分析,并与实测结果进行比较。

Owing to the fact that the Southwest Air Duct at the Wangfujing Station of the Fu-Ba line of Beijing Tube is closely neighboring other buildings, and the construction clearance is rather small, the air duct has to be built by means of shallow embedment and covered excavation. Because of its large structural section, the great height of its clearance, the low depth of its embedment, and its poor location where the soil is loose and moist, the level of underground water is high, and construction condition is very bad, the construction is made extremely difficult. To ensure construction security, the paper calculatedly analyzes the construction effects of the construction plan for the air duct in the light of the three-dimension limited unit analysis theory, comparing the calculated results with the practically measured ones.