上海洋山港区域饱和软黏土长期循环累积应变特性研究  

LONG-TERM CYCLIC CUMULATIVE DEFORMATION OF SOFT CLAY IN SHANGHAI YANGSHAN PORT AREA

作　　者：荣建 方志恒 韩凯 顾晓强[2] 赵国强 刘祥龙 RONG Jian;FANG Zhiheng;HAN Kai;GU Xiaoqiang;ZHAO Guoqiang;LIU Xianglong(Shanghai Urban Construction Municipal Engineering(Group)Co.Ltd.,Shanghai 200065,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]上海城建市政工程(集团)有限公司,上海200065 [2]同济大学地下建筑与工程系,上海200092

出　　处：《力学与实践》2025年第2期374-380,共7页Mechanics in Engineering

基　　金：国家自然科学基金项目(42361164615)资助。

摘　　要：轨道交通、道路等基础设施的地基通常受到交通载荷、机械振动等循环载荷作用,长期循环载荷对地基沉降的影响不容忽视。本文针对上海洋山港区域某自动化堆场道路在车辆作用下的长期累积沉降特性开展研究,对堆场饱和软黏土开展了大振次的不排水循环三轴试验,分析了循环次数、孔隙比、动应力以及围压等因素对累积变形的影响。试验结果表明,累计应变随着循环次数增加而增加,最终稳定值由孔隙比、动应力以及围压共同决定。通过试验结果分析,提出了计算饱和软黏土循环塑性累积应变的显式模型,并进一步分析了孔隙比、动应力比以及围压等因素与模型参数之间的关系。结果表明,该模型具有较好的拟合效果,能够较好地预测软黏土的长期不排水循环累积变形。The foundations of infrastructure,such as rail transit and roads,are typically subjected to cyclic loads from traffic,mechanical vibrations,and other sources.The long-term effects of these cyclic loads on foundation settlement cannot be overlooked.To investigate the long-term settlement of a road subjected to traffic load in Shanghai Yangshan port area,a series of undrained cyclic triaxial tests were performed on soft clay samples from this region.The experimental results indicated that the cumulative deformation increases with the number of load cycles.The stable deformation value depended not only on the applied cyclic stress and confined stresses,but also on the void ratio of the soil.Based on the experimental results,an explicit model was proposed to calculate the axial plastic cumulative strain of saturated clay subjected to cyclic loading.Furthermore,the relationship between factors such as void ratio,the applied cyclic stress,confined stresses,and model parameters was further analyzed.The results demonstrated that the model exhibited good fitting performance and could effectively predict the undrained cyclic cumulative deformation of soft clay.

关 键 词：饱和软黏土 循环三轴试验 塑性累积应变 显式模型 

分 类 号：TU411[建筑科学—岩土工程]