黄土地区土与混凝土接触界面大型直剪试验研究

通过改进的大型直剪仪进行粘土自身、粘土与混凝土4个含水率3个密度共64个试样的剪切试验.研究黄土地区土与混凝土接触界面抗剪强度随土体含水率以及土体密度变化规律,得到了不同密度土体在不同含水率不同正应力下土与混凝土接触界面的剪切应力应变曲线.由曲线可知土与混凝土接触界面的抗剪强度随土体含水率的增大均呈下降趋势、随土体密度增大呈增大趋势,表明土与混凝土接触界面的抗剪强度、摩擦角、粘聚力等力学参数与土体含水率以及土体密度密切相关.

Experimental Study on Soil-concrete Structure Contact Surface Shear Strength by Improved Direct Shear Tests in Direct of Loess

In order to learn the changing law of shear behavior of soil- concrete structure surface,an experimental study on soil-concrete structure contact surface is carried out by considering various soil water contents and various soil density. 64 specimen tests,which include soil-soil and soil-concrete contact surface,are conducted by using the improved direct shear .According to experimental data analysis,basic mechanical principles of soil-concrete structure interface are obtained. Shear strength specimen's decreases with large water content of soil and increases with large soil density. Experimental data shows that mechanical properties of soil-concrete structure contact surface,such as shear strength,cohesion force and friction angle,closely depend on soil water content and soil density.