（上海中船九院工程咨询有限公司， 上海 200063）

［摘要］众多深基坑工程事故表明，立柱竖向位移是引发支撑杆件失稳破坏、断裂而促使墙体位移过大、危害周边环境的重要原因之一。然而目前在基坑工程的设计和施工过程中，对立柱竖向位移的研究经常被忽视，使得内支撑体系的实际受力与设计产生一定的偏差，从而导致基坑发生安全事故。对立柱竖向位移的机理、危害、理论计算进行了概述；结合某基坑立柱竖向位移监测实例与根据支撑的极限弯矩所计算的立柱允许变形量进行对比；最后提出了立柱竖向位移控制的方法。

［关键词］软土地区； 深基坑； 竖向位移； 立柱隆起； 差异沉降

中图分类号： TU398.7  文献标识码： A  文章编号： 1002-848X(2015)S2-0139-04

作者简介：王莉，硕士，工程师，Email：lapingguowangli@163.com。 

Column vertical displacement of deep excavation in soft area

Wang Li

(Shanghai CSSC NDRI Engineering Consulting Co., Ltd., Shanghai 200063, China)

Abstract: Increasing number of deep excavation accidents indicate that vertical displacement of columns is one of the critical factors in leading to the damage and fracture of support rods, thereby resulting in significant displacement of wall and influencing surrounding environment. However, vertical displacement of columns is often overlooked in current excavation design and construction process. This may lead to discrepancies between actual and design stress, therefore resulting in excavation accidents. It reviewed the mechanism, harm, theoretical calculation of vertical displacement of excavation columns. Moreover, vertical displacement monitoring measures of a sample excavation was compared with the corresponding theoretical values calculated from the ultimate bending moment methodology. Finally, the authors proposed several strategies to control the vertical displacement of columns.

Keywords： soft area; deep excavation; vertical displacement; column uplift; differential displacement