不同掺剂对水泥土动力特性的影响

为研究水泥土的动态特性,采用普通水泥、矿渣水泥、水玻璃3种掺剂,利用共振柱,考虑不同掺量,在不同的围压和剪切应变的条件下,水泥土的剪切模量和阻尼比的变化规律进行了试验研究。试验结果表明:水泥土的最大剪切模量随围压的增加而增加,最小阻尼比随围压的增加而降低;3种掺剂在相同围压下矿渣水泥土的动剪切模量最大,阻尼比最小;水玻璃-水泥土在刚度退化之前承受的剪应力最大;水泥土的剪应变与动剪切模量的关系符合修正的Ramberg-Osgood模型曲线。

Effect of Additives on Dynamic Properties of Cement-Stabilized Soils

To research the dynamic shear modulus and damping ratio of cement-stabilized soil, the dynamic properties of three types of cemented soil were studied using resonant column test. They are cemented soil, slag cement stabilized soil, and cement with sodium silicate stabilized soil .The amount of cement admixed, the magnitude of confining pressure and the amplitude of shearing strain are considered. Test results show that with the increase of confining pressure, the maximum shear modulus of cement stabilized soil increases and the minimum damping ratio decreases. The relationship of shear modulus versus shearing strain conforms with the Ramberg-Osgood equations using regression analysis. Under the same confining pressure, slag cement stabilized soil has the largest shear modulus and the smallest damping ratio. The results also indicate that the cement with sodium silicate stabilized soil is able to sustain larger shearing strain before stiffness degradation than the other additives do.