基于工程应用的膨胀土本构模型

采用侧限有荷膨胀试验,研究了膨胀土有荷膨胀率和上部荷载、终了含水量以及过程含水量之间的关系,据此推导出了可以用来计算膨胀土路堤随含水量以及上部荷载变化而变形的本构模型。研究结果表明:在初始含水量一定的条件下,有荷膨胀率与上部荷载半对数呈线性关系,终了含水量与上部荷载半对数呈线性关系,有荷膨胀率与过程含水量呈线性关系;该模型是利用室内常规试验可以得到的,能反映研究地区岩土体主要性状的应用型本构模型。

Constitutive Model for Expansive Soil Based on Engineering Application

The relations among loaded swelling ratio and upper load, end moisture content and process moisture content were studied,with lateral loaded swelling experiment of expansive soils.Constitutive model varying with moisture content and upper load by these relationships which can be used to compute deformation of expansive soil embankment was deduced.The results show that the linear relation between loaded swelling ratio and semi-logarithm of upper load, the linear relation between end moisture content and semi-logarithm of upper load and the linear relation between loaded swelling ratio and process moisture content exist under the condition of initial moisture content to a certain extent.The model can be got by laboratory normal experiment and is a applied constitutive model which can reflect main property of soil in research area.