深基坑开挖围护结构受力特性分析与研究

Research on the Mechanical Characteristic of Retaining Structure in Deep Foundation Excavation

在土体蠕变作用下,冠梁的水平位移量会有所增加。由于大气降水导致基坑内外地下水位差变大,围护结构的侧压力和基底扬压力发生变化。另外,支撑轴力受混凝土凝固收缩、温差以及钢筋、混凝土之间的差异徐变影响,因此,计算支撑轴力时需进行修正。针对以上问题,论文以某商住楼基坑变形监测项目为例,研究了基坑开挖过程中,围护结构受力状态的改变。

Under soil creep, the horizontal displacement of the crown girder increases. Due to the atmospheric precipitation, the waterhead between in and outside foundation is larger, so the side pressure of retailing structure and the base pressure change. And the axial force is affected by concrete solidifies shrinkages, temperature difference, the different creep between reinforcement and concrete, so the calculation of axial force need to be modified. According to these problems, paper taking the foundation deformation survey of a commercial and residential building as an example,analyzes the mechanical characteristic of retailing structures in the process of foundation excavation.