杭州第四系软土动力特性试验与土结构性影响的探讨  

Discussion on dynamic test and characteristics of structural properties of Quaternary soft clay in Hangzhou region

作　　者：丁伯阳[1] 张勇[1] 

机构地区：[1]浙江工业大学建工学院,杭州310014

出　　处：《岩土力学》2012年第2期336-342,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.11172268);浙江省科技厅重大资助项目(No.2006C13062)

摘　　要：受新构造运动和气候变化的影响,杭州第四系软土地层相变多而复杂,并具有一定的结构性。为了研究杭州市第四系结构性软土的动力特性,开展了一系列动三轴试验,从而得到工程场地土的动应力-应变骨干曲线以及相关动力特性参数。通过试验研究发现,地层沉积环境的变化使软黏土产生结构性,并对其初始动弹性模量Ed0产生较大的影响。但土的结构性对于最大动应变幅值的控制是随机的,影响并不明显。结构性软土层的剪切波速值与测试点深度之间基本呈幂函数的关系形式,但土结构性特点会使剪切波速与深度的统计关系图象出现分叉。此外,土的结构性对阻尼比与剪切模量的统计关系方程会有一定的影响。Due to new tectonics movements and drastic climate change,there are different types,and thicknesses of sediment on Quaternary soft clay in Hangzhou region,which have some characteristics of structural properties in particular.In order to investigate the dynamic characteristics of Quaternary soft clay in Hangzhou region,a series of dynamic triaxial tests are conducted.The stress-strain backbone curves and some kinds of dynamic property parameters of structured soft clay in Hangzhou are obtained.It is discovered that the change of the sediment environment is a cause to structural properties of soft clay in Hangzhou region and affects initial dynamic elastic modulus Ed0 obviously.On the side of the maximum amplitude on dynamic strain,the control of structural properties of soft clay is random and unobvious.Generally,there is a good power function relationship between the shear wave velocity and buried depth of structural soft clay,but the different kinds of structural soft clays may have different relationships.In addition,it is shown that structural properties of soft clay could have some influences on the relationship between damping ratio and shear modulus.

关 键 词：杭州结构性软土 沉积环境 动三轴试验 骨干曲线 初始动弹性模量 剪切波速 阻尼比 

分 类 号：TU435[建筑科学—岩土工程]