非黏性土泊松比试验研究

土体泊松比是反映土体侧向变形的重要参数,但是目前的研究应用与模型参数的重要性不相符.通过基于局部变形测量的三轴试验,分析了泊松比的变化规律:在相同的成样方法和控制密度条件下,同一种材料的颗粒排列组合结构基本类似,在不同围压条件下的试样变形规律基本保持一致;随主应力比的增加,切线泊松比也随之增加,建立泊松比与主应力比之间的关系更符合泊松比取值规律.

Experimental research on Poisson's ratio of sandy soil

The Poisson’s ratio of soil is a significant parameter which reflects the characteristics of soil lateral deformation. The importance of this mechanical property has not been appreciated as much as it deserves. The variation of Poisson’s ratio is obtained through triaxial test based on local deformation measurement of soil specimen. Because the arrangement and combination structure of material particles are analogous under the same testing method and density, the variation of deformation law of specimen under different cell pressures is similar. The tangent Poisson’s ratio of soil increases when the principal stress ratio increases. It is reasonable to establish the relationship between the Poisson’s ratio and principal stress ratio.