高庙子膨润土抗剪强度预测模型研究

Research on Shear Strength Prediction Model of Gaomiaozi Bentonite

以内蒙古高庙子膨润土为研究对象,探究膨润土在单轴和三轴室内加载实验下,抗剪强度参数和土样高度、密度之间的函数关系。结合土体莫尔库仑强度理论,分析土体抗剪强度的变化规律,提出了膨润土抗剪强度预测模型。结果表明:实验过程中膨润土试样高度大小对内摩擦角变化起主要影响作用,对粘聚力影响较小;土体粘聚力随着试样密度的增大呈幂指数形式增加,内摩擦角大小不随密度的改变而变化。

Taking Gaomiaozi bentonite of Inner Mongolia as the basic research object,the function relation between the shear strength and density,height under experiments are studied.Combined with the Mohr-Coulomb theory,the variation of shear strength of soil from the microscopic is analyzed and the shear strength prediction model of bentonite is proposed.The experimental results show that:bentonite samples with different height of the experimental process has little effect on the size of soil cohesion while it plays a major influence on the variation of internal friction angle;the soil cohesion with increasing sample density increases exponentially while internal friction angle is not changed with the density change.