软土基坑开挖对等效水平抗力系数的影响  

Influence of Excavation of Soft Soil Foundation Pit on Equivalent Lateral Resistance Factor of Soils Coefficient

作　　者：贾凯 王翠英 JIA Kai;WANG Cuiying(School of Civil Engin.,Architecture and Environment,Hubei Univ.of Tech.,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《湖北工业大学学报》2022年第1期91-95,共5页Journal of Hubei University of Technology

摘　　要：基于现场实测挡墙位移,运用有限元软件Midas GTS NX建立了三维模型,使基坑挡墙位移的计算值与实测值逼近,从而计算出各工况下能反映土体变形总体效应的综合参数——等效水平抗力系数K_(h)。结合武汉某深基坑工程的特点,分析了在基坑几何形状不对称、周边荷载分布不对称和被动区土体加固等因素影响下K_(h)值的变化规律。分析结果表明K_(h)值的变化具有显著的三维空间效应,且土体的被动抗力随时间而不断衰减。在基坑施工过程中,考虑时空效应的影响并充分利用土体的被动抗力分布规律,对维持基坑稳定性具有重要意义。Based on the measured displacement of the retaining wall,a three-dimensional model was established using the finite element software Midas GTS NX.The calculated value of the displacement of the retaining wall is close to the measured value,so the equivalent horizontal resistance coefficient K_(h) can be calculated.K_(h) is a comprehensive parameter,which can reflect the overall deformation of the soil under various working conditions.According to the characteristics of a deep foundation pit project in Wuhan,three factors,including asymmetrical geometry of the foundation pit,asymmetry of surrounding load distribution,and soil reinforcement in the passive zone,have been studied to influence the K_(h) value.The results show that the change of K_(h) value has a significant three-dimensional space effect,and the passive resistance of the soil continues to attenuate with time.In the process of foundation pit construction,it is of great significance to consider the influence of time and space effects and use the distribution law of passive resistance of the soil to maintain the stability of the foundation pit.

关 键 词：深基坑工程 等效水平抗力系数 不对称荷载 不对称基坑 被动区加固 

分 类 号：TU47[建筑科学—结构工程]