坑中坑的基坑变形分布及其变化规律  

Study on Distribution and Variation of the Deformation of Pit in Pit Excavation

作　　者：徐飞飞[1] 崔梓萍 徐意智[1] 刘靖[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]上海临港新城建设工程管理有限公司,上海201306

出　　处：《地下空间与工程学报》2012年第A01期1376-1380,1388,共6页Chinese Journal of Underground Space and Engineering

摘　　要：坑中坑的设计施工是一个十分重要却又经常被忽视的问题。通过建立数值模型,分析不同条件下坑中坑的内坑开挖对于外坑围护结构变形的影响,引入围护结构侧移影响率β,以综合考虑内坑开挖对外坑的影响以及外坑围护结构的累计变形量大小。总结了内坑开挖位置及其尺寸对于基坑变形规律的影响,并提出一些有益于坑中坑设计和施工的结论。The design and construction of ＂pit in pit＂ （PIP） is a significant problem which is often overlooked. In this article, the deformation of retaining structure of the outer-pit after excavation of the inner-pit under different conditions is analyzed by establishing numerical models. A concept of impact rate of lateral displacement of the retaining and protecting structure, which is expressed with the letter ＂[3＂, is introduced, so that the impact of the excavation of the inner-pit and the total deformation of the retaining structure of the outer-pit are considered simultaneously. The impact of the location and size of the inner-pit on the deformation regulation of the retaining structure of the outer-pit is summarized. Some useful conclusions for designing and construction of PIP are drawn.

关 键 词：坑中坑基坑 变形规律 数值模拟 

分 类 号：TU443[建筑科学—岩土工程]