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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 the influence of Neotectonic movement and climate change, the Quaternary soft-clay strata in Hangzhou have many complex and complicated phase transitions and have some structural features. In order to study the dynamic characteristics of Quaternary structural soft soil in Hangzhou, a series of dynamic triaxial tests were carried out to obtain the dynamic stress-strain curve and the related dynamic characteristics of the soil in the project site. Through experimental study, it is found that the change of sedimentary environment causes the structural properties of soft clay, and has a great influence on the initial dynamic elastic modulus Ed0. However, the structural control of soil is largely random and its influence on the maximum dynamic strain amplitude is not obvious. The relationship between the shear wave velocity and the depth of the test point in the structural soft soil is basically a power function. However, the structural characteristic of the soil can cause the branching of the statistical relationship between shear wave velocity and depth. In addition, the structural constitutive of soil has a certain influence on the equation of statistical relationship between damping ratio and shear modulus.