软土地区深基坑工程存在的变形与稳定问题及其控制——软土地区深基坑坑底隆起变形问题  

Stability and Deformation Problems During Deep Foundation Excavation in Soft Soil Area and Their Control Measures——Heave Deformation due to Deep Foundation Excavation in Soft Soil Area

作　　者：郑刚[1] 焦莹[2] 李竹[2] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津城投建设有限公司,天津300050

出　　处：《施工技术（下半月）》2011年第5期10-15,共6页Construction Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2010CB732106);天津市科技支撑计划资助项目(11ZCGYSF00800)

摘　　要：目前常用的弹性抗力法在计算基坑开挖引起的变形时,只能考虑围护桩(墙)在土压力作用下产生的变形,没有反映软土中深基坑开挖的坑底隆起变形及其引起的围护桩(墙)变形和坑外土体沉降。已有的实测结果表明,软土桩深基坑开挖产生的坑底隆起变形及其引起的支护结构和土体的附加变形较为显著,因此,软土中的深开挖引起的隆起变形及其工程效应不容忽视,并应采取针对性措施予以控制。Elastic-resistance method is usually used to calculate the horizontal displacement of diaphragm wall or supporting piles of deep excavation. However, this method can only predict the horizontal deformation caused by the earth pressure and fail to consider the deformation caused by the heave of soil beneath the formation of excavation and it＇ s effect on the settlement of soil behind diaphragm wall or supporting piles. A lot of field measurement data show that the heave of soil beneath the formation of excavation due to deep excavation in soft ground is significant and can cause additional significant deformation of retaining structures. Consequently, attention should be paid to the heave due to deep excavation in soft soil and its effect, and countermeasures should be taken when it is necessary to control the deformation of retaining structures and soil.

关 键 词：软土 深基坑 弹性抗力法 隆起变形 

分 类 号：TU447[建筑科学—岩土工程]