酸污染红土物理性质的变化特征

摘要

In this paper, a contrast study is made of the physical characteristics of acid pollution laterite by laboratory tests, including grain composition, specific gravity and boundaries moisture content, considering the influence of dispersing agent and salt-leaching. The results show that without dispersing agent and salt-leaching, the silt content decreases with lower acid concentration but increases with higher acid concentration. With the extended curing time, the silt content decreases with lower acid concentration, but decreases, then increases with higher acid concentration. Silt content decreases after salt-leaching, but increases without dispersing agent. The specific gravity, liquid limit and plastic limit, plasticity index of acid pollution laterite decrease with accrescent acid concentration and extended curing time. The changes in physical characteristics of acid pollution laterite are the combined result of corrosion stage, salt-forming stage and dissolution stage.%考虑酸浓度和养护时间的影响,通过室内试验对比研究了酸污染红土的颗粒组成、比重和界限含水率等物理特性.研究结果表明:不洗盐、加分散剂,酸浓度较低时粉粒含量减小,酸浓度较高时粉粒含量增大；随养护时间延长,浓度较低时粉粒含量减小,浓度较高时粉粒含量先增后减；洗盐后粉粒含量减小,不加分散剂粉粒含量增大.酸污染红土的比重、液塑限与塑性指数随酸浓度的增大和养护时间的延长总体都呈减小的趋势.酸污染红土物理性质的变化可以从酸污染红土所存在的腐蚀、成盐和溶解三个阶段来解释.