有机质污染下红黏土物理力学特性变化规律分析

Analysis on Change Law of Physical and Mechanical Properties of Red Clay Contaminated by Organic Matter

桂林地区分布的红黏土,具有高液塑限、高含水率和较高承载力等特点。通过有机质影响红黏土的作用机理进行分析,采用室内试验的手段和单因子的试验方法,改变有机质的掺量和含水率,来研究有机质红黏土的物理力学性质指标的变化规律。结果表明:随着有机质含量的增加,试样的液限、塑限、塑性指数呈现出一定的增长规律。随着有机质含量的增加,在一定范围内,试样的抗剪强度不断减少而压缩性不断的增加。随着含水率的增加,试样的抗剪强度不断减少而压缩性不断的增加。

The red clay distributed in Guilin region has high liquid-plastic limit, high moisture content and high bearing capacity. In this paper, the action mechanism of how organic matter affecting red clay was analyzed first and, by indoor tests and single-factor test method as well as with the change of the proportion of organic matter and moisture content, the change law of physical and mechanical properties of organic red clay was studied. The results show that as the content of organic matter increases, the liquid limit, plastic limit and plasticity index of the specimen present certain growth law, thus within a certain range, constantly, the shear strength of the specimen decreases while the compressibility increases; moreover, as the moisture content increases, constantly, the shear strength thereof decreases while the compressibility increases.