下立交深基坑围护工程选型与应用

Type Selection and Application of Deep Foundation Pit Enclosure Engineering for Underpass

介绍了上海市奉贤区金海公路(大叶公路—浦南运河)道路改建工程航南下立交深基坑围护工程。针对该下立交毗邻轨道线、周边场地狭小、地质环境复杂、地下水系发达、周边存在重要管线及建(构)筑物等影响因素,对基坑围护选型及其应用进行了分析,确定了基坑的安全等级及环境保护等级,明确了相对经济环保的型钢水泥搅拌墙围护方式。通过传统基坑计算软件和有限元软件的双重验算,深度剖析了基坑变形规律,精细化评估深基坑工程对周边环境的影响,分析结果显示变形是可控的。

The deep foundation pit enclosure engineering for Hangnan Underpass in Shanghai Fengxian District Jinhai Highway(Daye Highway-Punan Canal)Road Reconstruction Project is introduced.Aiming at the affecting factors of this underpass adjacent to the railway line,narrow surrounding site,complex geological environment,developed underground water system,and important pipelines and buildings(structures)around,the type selection and application of the foundation pit enclosure are analyzed to determine the safety grade of foundation pit and the protection class of environment,and to clarify the relative economic and environmental protection enclosure way of section-steel cement concrete mixing wall.Through the dual checking calculation of the traditional calculation software and the finite element software of foundation pit,the deformation law of foundation pit is deeply analyzed.The influence of foundation pit engineering on the surrounding environment is evaluated in detail.The analysis result shows that the deformation can be controlled.