摘要
为了探究初始静剪对砂土循环剪切行为的影响,文中在不同静剪和循环应力下对纯砂和粉砂进行了一系列循环三轴试验。试验现象表明,不同的固结条件使得砂土的循环液化行为被分为“循环活动性”和“残余变形累积”。结果分析显示粉砂的动强度通常高于纯砂;随着压缩侧初始静剪应力的增大,两者的孔压发展规律出现了明显的差异;等效杨氏模量(E_(eq))与循环轴向应变幅值(ε_(a,cyc))之间存在良好的相关性,这一关系主要与初始静剪应力有关,不受循环应力幅值和粉粒含量的影响。
To investigate the effect of shear static stress on the undrained cyclic response of sand-silt mixture,systematic triaxial tests were carried out on both clean and silty sands under varying static and cyclic shear stress levels.Failure modes subjected to the different consolidation conditions,which is cyclic mobility and residual deformation accumulation.The experiment results indicated that the addition of silty fines had a promoting effect on cyclic resistance.The clean sand has a more rapid development of pore water pressure than that of silty sand with the increase of the initial static stress on the tensile side.A good correlation exists between the equivalent Young’s modulus(E_(eq))and cyclic axial strain amplitude(ε_(a,cyc)),which is mainly related to the initial static stress but less affected by cyclic stress amplitude and fines content.
作者
周高云
管红辉
ZHOU Gaoyun;GUAN Honghui(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)
出处
《低温建筑技术》
2022年第5期109-114,共6页
Low Temperature Architecture Technology
关键词
初始静剪
不排水循环三轴
动强度
孔压
刚度
static shear stress
undrained cyclic triaxial test
cyclic resistance
pore pressure
stiffness
