软土超深圆形基坑开挖卸载土体回弹变形性状研究

Study on the Springback Deformation Behavior of the Soft Soil during Excavation of the Ultra-Deep Circular Foundation Pit

本文通过上海苏州河段深层排水调蓄管道系统工程云岭超深圆形竖井基坑施工过程中,基坑土方卸载施工引起坑内各土层回弹隆起变形,基于大量详实的测试数据,系统总结了深基坑开挖卸载全程土体的回弹变形规律及相关影响因素,为后续软土地区超深基坑工程设计参数的选取与优化提供了相关借鉴与参考。

In this paper, based on the detailed and accurate testing data of springback and uplifting of the soil layers caused by unloading construction during the excavation of Yunling ultra-deep circular shaft foundation pit in the project of the deep drainage and storage pipeline system of Suzhou River in Shanghai, the law of the soil rebound deformation and related influencing factors during the whole process of deep foundation pit excavation and unloading are summarized as references for the selection and optimization of design parameters of super deep foundation pit in soft soil area.