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（上海中船九院工程咨詢有限公司， 上海 200063）

［摘要］眾多深基坑工程事故表明，立柱豎向位移是引發(fā)支撐桿件失穩(wěn)破壞、斷裂而促使墻體位移過大、危害周邊環(huán)境的重要原因之一。然而目前在基坑工程的設(shè)計(jì)和施工過程中，對(duì)立柱豎向位移的研究經(jīng)常被忽視，使得內(nèi)支撐體系的實(shí)際受力與設(shè)計(jì)產(chǎn)生一定的偏差，從而導(dǎo)致基坑發(fā)生安全事故。對(duì)立柱豎向位移的機(jī)理、危害、理論計(jì)算進(jìn)行了概述；結(jié)合某基坑立柱豎向位移監(jiān)測(cè)實(shí)例與根據(jù)支撐的極限彎矩所計(jì)算的立柱允許變形量進(jìn)行對(duì)比；最后提出了立柱豎向位移控制的方法。

［關(guān)鍵詞］軟土地區(qū)； 深基坑； 豎向位移； 立柱隆起； 差異沉降

中圖分類號(hào)： TU398.7  文獻(xiàn)標(biāo)識(shí)碼： A  文章編號(hào)： 1002-848X(2015)S2-0139-04

作者簡介：王莉，碩士，工程師，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