考虑地下连续墙环向抗力的基坑稳定性分析  

Stability Analysis Method Considering the Circumferential Resistance of Diaphragm Wall

作　　者：翟之阳 聂东清 周质炎 Zhai Zhiyang;Nie Dongqing;Zhou Zhiyan(Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,200092,China)

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,200092

出　　处：《特种结构》2024年第4期36-42,共7页Special Structures

基　　金：上海建工集团股份有限公司重点科研项目(22YJKF-19)。

摘　　要：大埋深的盾构或顶管的施工竖井常采用圆形地连墙基坑围护形式。圆形基坑显著的空间效应有利于提高基坑稳定性,但目前还没有可用于实践的圆形基坑稳定性计算方法。提出了一种考虑地下连续墙环向抗力作用的圆形基坑抗倾覆稳定性分析方法,该方法的重点在于确定圆形地下连续墙环向抗力值。分析表明,地下连续墙接头、环向偏压荷载、圆形基坑实际形状等因素对环向抗力值有显著影响,应用中必须考虑这些因素的影响。由于环向抗力是圆形地下连续墙自身结构强度的反应,而未考虑圆形基坑空间效应对主被动土压力、破坏面形状的影响,因此该计算方法是相对安全的。Deep circular diaphragm wall shafts are commonly used in tunnel construction and pipe-jacking.While the arching effect of a circular diaphragm wall shaft enhances its stability,there is currently no established calculation method specifically for circular diaphragm wall shafts.In this paper,a method for analyzing the overturning stability of circular diaphragm wall shafts considering the circumferential resistance is proposed.The key aspect of this method is to determine the circumferential resistance value.The analysis shows that factors such as vertical joints between panels,circumferential eccentric loads,and the actual shape of diagram walls all have significant impacts on the circumferential resistance value.The influence of these factors must be considered when calculating circumferential resistance.Since the circumferential resistance is solely depended on the structural strength of the circular diaphragm wall shaft itself and does not take into account the beneficial influences of the arching effect on the active and passive earth pressures or the shape of the failure surface,this calculation method is conservatively safe.

关 键 词：圆形基坑 地下连续墙 抗倾覆稳定性 环向抗力 

分 类 号：TU470[建筑科学—结构工程]