某地铁车站基坑围护墙体变形规律分析

Analyses on Deformation Law of Support Wall for Foundation Pits

密切结合上海地铁M8线某车站工程实践,分析了基坑围护墙体的变形特征。发现在基坑施工中,利用时空效应规律,适量地减少每步开挖空间和时间并缩短每步开挖所暴露的挡墙的自由暴露时间,可以明显地减少基坑位移。科学地运用这种基坑开挖的时空效应的规律性,充分调动软土自身控制变形的潜力,可以达到科学施工控制基坑变形的目的。

The deformation performance of support wall for foundation pits was analyzed based on the practice of a station on Shanghai Subway Line M8. It was found that the pit displacement can be reduced obviously during the excavation of pits by decreasing appropriate amount of excavation space and time every step and by shortening free exposure time of pit＇s wall, making use of tau-effect laws. The goals of controlling pit deformation scientifically can be reached by using the laws of tau-effect while excavating the foundation pits and sufficiently stimulating the potential self control of deformation of soft soil.