预留反压土中心顺作法在某超大深基坑中的应用  

Application of earthberm and bottom-up method in an extra-large deep excavation project

作　　者：窦华港[1] 焦莹[2] 

机构地区：[1]天津市建设管理委员会,天津300032 [2]天津城投建设有限公司,天津300010

出　　处：《岩土工程学报》2008年第S1期484-488,共5页Chinese Journal of Geotechnical Engineering

基　　金：天津市科技创新专项资金资助项目(07FDZDSF01200)

摘　　要：介绍了在天津站交通枢纽主广场工程大型基坑采用了地下连续墙结合坑边预留反压土挡土、中心顺作的方法,对该法应用的设计特点和施工技术进行了分析。结合实测资料分析了逆作部分中间柱基坑开挖的隆沉规律、基坑底的回弹、地下连续墙地竖向与水平向位移及其与土方开挖进程的关系。揭示了该施工方法下基坑的变形规律,为相似条件下的工程设计和施工提供了工程经验。Diaphragm walls combined with the earthberm to retain the soil and the bottom-up method were adopted in a large scale excavation project,which is part of the project of Tianjin transport hub.The design and construction techniques were analyzed.Based on the field monitoring data,the change of vertical displacement of soldier beams,rebound of foundation pit bottom,vertical and horizontal displacement with the process of excavation were presented.The mechanism of ground deformation and displacement of retaining system was revealed.This project can provide an example for the similar projects under similar ground conditions.

关 键 词：开挖 反压土 顺作法 回弹 

分 类 号：TU473.2[建筑科学—结构工程]