干密度对稻草加筋盐渍土和稻草加筋石灰土的抗剪强度影响

土的抗剪强度受土的类型、含水率和干密度等多种因素的影响.为研究干密度对稻草加筋土的抗剪强度影响,制备了三种干密度的加筋盐渍土和加筋石灰土的试样,其三轴压缩试验结果为:两种加筋土的黏聚力随干密度的增大而增大,但内摩擦角变化不大;相同干密度时,加筋石灰土的主应力差远大于加筋盐渍土;不同干密度的加筋土,当轴向应变较大时,干密度对加筋土主应力差的影响消失,此时加筋土的主应力差主要取决于围压.总体而言,干密度的变化对加筋石灰土的抗剪强度影响较大;干密度为1.76,g/cm3的加筋石灰土,其抗剪强度较优.

Effects of Dry Density on Shear Strength of Soils of Salinity and Lime Reinforced with Rice Straw

The effect of the shear strength of soil was influenced by the type of soil, water content and dry density. In order to study the effects of dry density on the shear strength of the saline soil reinforced with rice straw, the specimens of reinforced saline soil and reinforced lime-soil at the condition of three kinds of dry density were prepared. The results of triaxial compression test show that： the value of cohesion of the two reinforced soil increases as dry density increases, but the internal friction angle has little change; for the soil of the same dry density, the principal stress difference of reinforced lime-soil is bigger than reinforced saline soil; for the soil of different dry density, when the axial strain is bigger, the effects of dry density on the principal stress difference disappear, mainly depending on the confinement pressure. Generally speaking, the effects of different dry density on the shear strength of the lime-soil reinforced with rice straw are quite great, the maximum value of the shear strength of reinforced lime-soil is observed at the dry density of 1.76 g/cm3.