期刊论文

Constitutive Relation with Double Yield Surfaces of Expansive Soil Improved by Lime and Flyash Subjected to Wetting-drying Cycles

中文

工程科学与技术

2096-3246

2021

53

2

75-83

10.15961/j.jsuese.202000141

2014DFA53120:国家国际科技合作专项基金 20c1682:湖南省教育厅项目

本校为其他机构

基于椭圆–抛物线弹塑性本构模型,研究了干湿循环条件下石灰粉煤灰改良膨胀土的双屈服面弹塑性应力–应变本构关系。首先,通过一系列三轴固结排水剪切试验,分别得到不同干湿循环次数下石灰粉煤灰改良膨胀土的偏应力q与轴向应变ε1、剪应变εs,以及轴向应变ε1与体应变εv的试验曲线;然后,根据三轴试验结果拟合本构模型中的各参数与干湿循环次数之间的关系表达式;最后,引入考虑干湿循环次数的因子,建立考虑干湿循环的双屈服面弹塑性本构模型。研究表明:1)干湿循环作用下,偏应力q与轴向应变ε1关系表现为应变硬化,与体应变εv表现为应变剪缩;q–ε1、q–εs试验曲线都呈现出近似双曲线特征。2)干湿...

The elasto-plastic stress-strain constitutive relation with double yield surfaces of expansive soil improved by lime and flyash was studied based on the ellipse-parabola constitutive model. Firstly, a series of the triaxial consolidated drained shear tests of the expansive soil improved by lime and flyash under wetting-drying cycles were conducted to obtain the test curves of deviatoric stress q and axial strain ε1, shear strain εs, and the test curves of bulk strain εv and axial strain ε1, respectively. Secondly, the expressions between th...