黏土动、静弹性模量相关性试验研究

TEST RESEARCH ON RELATIVITY BETWEEN DYNAMIC AND STATIC ELASTIC MODULUS OF CLAY

从实地黏性土的工程特性和动力特性试验入手,通过标准击实试验、抗压试验和波速测定等,并对7个样品的动、静态弹性参数进行测试、分析,研究不同含水率黏土样品的动、静态弹性参数试验和两者之间的转换关系,提出将含水率与密度的比值作为研究动、静态弹性参数的关系变量,建立该黏土的动、静态弹性模量和动、静态泊松比之间的转换关系。试验结果表明:(1)动、静态弹性模量和动、静态泊松比与含水率之间存在较好的三次曲线关系,动、静态弹性模量随含水率的升高而减小,动、静态泊松比随含水率的增加先增大后减小再增大,而动、静态弹性模量之比随含水率的升高而增大,动、静态泊松比之比随含水率的升高先减小后增大再减小(;2)动、静态弹性模量之比、动、静态泊松比之比与含水率密度之比之间也存在较好的三次曲线关系,动、静态弹性模量之比随含水率与密度的比值的增大而增大,动、静态泊松比之比随含水率与密度的比值的增大呈减小趋势;(3)动态弹性模量大于静态弹性模量,动态泊松比小于静态泊松比;(4)含水率与密度的比值作为研究动、静态弹性参数的关系变量,具有高的拟合精度;(5)动、静态泊松比随含水率的变化较弹性模量随含水率的变化小,动静泊松比之比随含水率与密度的比值的变化也较动、静态弹性模量随含水率与密度比值的变化小。该项研究为黏土动弹性模量在工程实际中的应用提供了试验依据,且为黏土的动、静弹性模量关系研究提供新的研究方法。

According to the engineering and dynamic characteristics of certain clay,the relationship between dynamic and static elastic modulus of the clay with different water contents has been studied by standard compaction test,compression test,wave velocity measurement and analysis of dynamic and static elastic parameters of seven clay samples.The ratio of water content to density is used as a variable to study dynamic,static elastic parameters.The transformations of dynamic,static elastic modulus and dynamic,static Poisson′s ratios have been constructed.The test results indicate that：（1） the relationship between dynamic or static elastic modulus and water content is a cubic curve,and so are the dynamic and static Poisson′s ratios.The dynamic and static moduli decrease while static and dynamic Poisson′s ratios firstly decease and then increase when water content increases;（2） the cubic curve is also suitable for the relationship between the ratio of dynamic to static elastic modulus and the ratio of water content to density.The ratio of dynamic to static elastic modulus increases while the ratio of the static to dynamic Poisson′s ratio firstly deceases and then increases when the ratio of water content to density increases;（3） the dynamic elastic modulus is larger than the static one;but the dynamic Poisson′s ratio is smaller than the static Poisson′s ratio;（4） the ratio of water content to density as transformation variable between dynamic and static elastic parameters has high fitting accuracy;（5） the static and dynamic Poisson′s ratios vary smaller than the elastic modulus when the water content changes and the similar results have been gotten when the ratio of the water content to density changes.This research presents the experimental basis for the application of dynamic and static elastic moduli of clay in engineering and also provides a new method to study the relationship between the dynamic and the static elastic modulus of clay.