论文部分内容阅读
本文在大量程应变和侧限压力条件下确定了经过8％石灰处理的高岭土、钠蒙脱土和钙蒙脱土三种压密粘性土的动态性质。三种土的塑性指数范围是:18到514。经过石灰处理影响并改善了三种土的动态性质。这三种土,随着应变范围的增加周期性正割剪切模量减小,等量粘滞衰减系数增大。随着石灰含量的增加,钠蒙脱土的剪模量显著增大,等量粘滞衰减系数减小。钙蒙脱土也具有相似的性质。两种蒙脱土之间反应曲线的差异被认为是由于钙蒙脱土中原来就存在钙而造成的。高岭土对石灰处理的特性曲线是比较缓和的。本文提出了处理土相对于未处理土的规范化曲线。这些曲线图为改善粘性土的动态性质所需石灰量的初步估算提供了有益的指导作用。
In this paper, the dynamic properties of three kinds of compacted cohesive soils, kaolin, sodium montmorillonite and calcium montmorillonite, treated with 8% lime, were determined under large-scale strain and lateral pressure conditions. The plasticity index range for the three soils is: 18 to 514. Lime treatment affected and improved the dynamic properties of the three types of soil. For these three types of soils, the periodic secant shear modulus decreases with increasing strain range, and the equivalent viscous attenuation coefficient increases. With the increase of lime content, the shear modulus of sodium montmorillonite increases significantly, and the equivalent viscous attenuation coefficient decreases. The calcium montmorillonite also has similar properties. The difference in the response curve between the two montmorillonites is thought to be due to the presence of calcium in the calcium montmorillonite. The characteristic curve of kaolin to lime treatment is relatively gentle. This article proposes a normalized curve for treated soil versus untreated soil. These graphs provide useful guidance for the preliminary estimation of the amount of lime needed to improve the dynamic properties of cohesive soils.