粉砂土地基既有超大基坑加深的支护技术及效果分析
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(浙江省建筑设计研究院,杭州 310006)[摘要]钱江国际时代广场是位于杭州钱江新城粉砂土地区的超大型基坑。该基坑在围护体设置完毕且开挖到6m时,地下室由2层改为3层。详细介绍了基坑加深后如何合理利用原有围护结构及采取的其他有效技术措施。同时,结合实际工程详细的监测资料,对该工程基坑加深的支护技术及效果进行了深入分析。[关键词]超大型基坑;加深;降水;监测中图分类号:TU463文献标识码:A文章编号:1002-848X(2011)05-0104-04Retaining scheme and effects of a large-scale deep pit with increasing depth on silty sand foundationLi Binghe(Zhejiang Province Architectural Design and Research Institute, Hangzhou 310006, China)Abstract:Qianjiang International Time Square project is built on silty sand foundation with a large scale deep pit in Hangzhou CBD. The basement was changed from two-floors to three-floors after the pit had been excavated in the depth of 6m. The design process of the retaining structure was introduced in detail. It is proved that the scheme is reasonable and economical for utilizing the original retaining structure.Keywords:large-scale deep excavation;increasing the excavation depth;dewatering; monitoring作者简介:李冰河,教授级高级工程师,Email:libinghe2009@qq.com。参考文献[1]浙江大学建筑设计研究院. 钱江国际时代广场工程岩土工程勘察报告[R]. 2005.[2]浙江浙峰工程咨询有限公司. 杭州钱江国际时代广场基坑围护工程设计[R]. 2006.[3]浙江省建筑设计研究院. 杭州钱江国际时代广场基坑支护设计说明[R]. 2007.[4]浙江大学岩土工程研究所. 杭州钱江国际时代广场基坑开挖监测总结报告[R]. 2008.