考虑地墙渗漏影响的地铁基坑安全性状研究

Study of Security in Subway Excavation Concerning Influence of the Seepage in Diaphragm Wall

在饱和含水软土层开挖基坑,地下水已成为影响基坑安全的最重要因素之一。对于地铁基坑,一般都会采取基坑降水等措施,但其地下连续墙施工质量的优劣直接影响了地下水对基坑的危害程度,结合已有的文献和工程资料,在分析地下连续墙渗漏对墙周地下水影响的基础上,根据基坑降水计算方法,从理论角度考虑地下连续墙渗漏时基坑的安全评判,并根据实际工程案例分析文中所提出评判方法的适用性,希望工程建设者们在施工中注意相应的问题,避免不必要的险情发生。

During excavation in saturated soft soil the underground water has been one of the most important factors that affect the security in subway excavation. Although some measures such as precipitation will be generally applied to foundation ditch, but the construction quality of diaphragm wall affects directly the density of inflection caused by underground water. So based on present literature, engineering data and the analysis of the influence of seepage of diaphragm wall on underground water, this article proposes theoretical method of security appraisal on excavation when seepage appears in diaphragm wall and analyzes the applicability of the method according to practical engineering. The purpose of the paper is to draw engineers＇ attention to the problem in construction and to avoid unnecessary hazards.