基于局部与整体变形测量的粉土泊松比试验研究  

Experimental researches on Poisson’s ratio of silty soil based on local and whole deformation measurements

作　　者：孙益振[1] 邵龙潭[1] 

机构地区：[1]大连理工大学工程力学系工业装备结构分析国家重点实验室,辽宁大连116024

出　　处：《岩土工程学报》2006年第8期1033-1038,共6页Chinese Journal of Geotechnical Engineering

基　　金：教育部高等学校骨干教师资助计划资助项目(2000-65);留学回国人员科研启动基金资助项目(2001-345)

摘　　要：通过两种测量方法对泊松比结果进行的分析,研究得出了泊松比的变化规律:轴向应变–径向应变关系曲线变化规律在各围压条件下基本相同,切线泊松比在加载初期(小应变变形阶段)都是从0.2～0.3开始变化,达到0.5时的径向变形很小,局部变形图像测量的切线泊松比的变化要比整体变形传统测量的泊松比变化快,其平均值也比整体变形传统测量结果大。随主应力比的增加,切线泊松比也随之增加,当土体的主应力比达到一定范围后,切线泊松比的值大于0.5,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。The variation Poisson＇s ratio was obtained by comparison between the results of two measuring methods. The variation of axial strain-radial strain curve under different cell pressures was similar. The tangential Poisson＇s ratio changed from 0.2 to 0.3 under the initial loading, and reached 0.5 at very small strain. The tangential Poisson＇s ratio of local deformation varied faster than that of the traditional full deformation measurement and the average value of the former was larger than that of the latter. The tangential poisson＇s ratio of soil increased when the principal stress ratio increased. When the principal stress ratio reached a certain value, the increment of tangential Poisson＇s ratio would be larger than 0.5. It was reasonable to establish the relationship between the Poisson＇s ratio and the principal stress ratio.

关 键 词：泊松比 三轴试验 粉土 

分 类 号：TU411[建筑科学—岩土工程]