明挖地铁车站主体结构最不利设计水位分析

我国华南、华东、华中地区及沿海城市地下水丰富,地下水压力是影响地铁车站主体结构受力的重要因素,随着水头高度的变化结构受力会随之发生改变。为了研究不同的水位对车站主体结构受力的影响,结合众多地下水丰富的地铁工程实例,选取多种水位进行数值模拟计算,结果表明:影响顶板、中板、底板及侧墙的最不利水位并不是统一的水位。为了方便设计,通过将众多正常使用中的地铁车站结构受力情况对比分析,认为:选取工程场地内最高水位进行车站结构受力计算,然后对部分构件配筋面积进行调整,能够满足车站结构安全的要求。

Analysis of Most Unfavorable Design Water Level of Open-and-cut Metro Station Main Structure

In Southern China,East China,Central China and coastal cities,groundwater pressure is an important factor affecting the main structure of the subway station. With the change of the water head height,the structure stress is also changed. In order to study the effect of different level on the station main body structure,this article,with reference to variety of water-rich metro engineering cases,selects different water level many for numerical simulation and calculation. The results show that the most unfavorable water level affecting the top plate,the middle plate,the bottom plate and the side wall is not uniform. In order to facilitate the design,the article,based on the stress analysis of a large number of subway station structures in normal service,concludes that the highest level of the station structure is selected to calculate structure stress,and then adjust the area of reinforcement of partial components so as to meet the requirements for the safety of station structures.