砂质原状黄土强度各向异性试验研究

为研究各向异性条件下原状黄土的变形及强度特性,针对取自北京市郊某施工现场原状黄土试样,在保持土样天然含水率条件下,分别对水平方向和竖直方向原状土样开展了固结不排水和固结排水三轴剪切试验.试验结果表明:试验用原状黄土黏粒含量相对较低,砂粒含量则偏高;其抗剪强度在水平方向和竖直方向表现出明显的各向异性.对于固结不排水试验,...

Experimental Investigation on Anisotropy of Shear Strength for Undisturbed Sandy Loess

In order to analyze the deformation and strength characteristics of the undisturbed loess under the anisotropic condition,the consolidated undrained and consolidated drained triaxial shear tests were carried out on the horizontal and vertical undisturbed loess samples taken from a construction site in Beijing area under the condition of keeping the natural moisture content of the soil samples.The results show that the clay content of undisturbed loess in Beijing is lower than that in other areas,while the sand content is higher,and its shear strength shows obvious anisotropy in horizontal and vertical directions.In the consolidated undrained test,the internal friction angle and cohesion in the vertical direction are greater than that in the horizontal direction.When the confining pressure increases,the maximum deviatoric stress and failure strain of the specimens in horizontal and vertical directions will also increase.In the consolidated undrained test,the maximum deviator stress and failure strain in the vertical direction and the horizontal direction gradually increase.When the confining pressure increases,the maximum deviatoric stress of the specimens in horizontal and vertical directions also increase.The failure strain of the horizontal specimens increase gradually,while that of the vertical specimens decrease first and then increase.