膨胀土多指标定量分类方法研究

A study of the quantitative classification of expansive soils based on multi-indices

膨胀土的胀缩等级评判是进行膨胀土治理的首要任务,对膨胀土的判别与分类方法开展研究具有重要意义。本文在前人研究的基础上,选取膨胀土分类常用的4项指标(液限、塑限、自由膨胀率和标准吸湿含水率),利用粗糙集理论对各指标在分类时的重要性进行评价,进而建立一种简单的膨胀土多指标定量分类方法,易于工程实践操作。

Identification and classification of expansive soils are the main tasks that should be firstly solved in constructions in regions occurring expansive soil.Based on previous studies,in this paper we choose four indices,namely,liquid limit,plastic limit,degree of free swelling and standard moisture absorption water content of soil.They are usually involved in the classification of expansive soils.The significance of the above four indices is evaluated using the rough sets theory.According to the significance results,a simple quantitative classification of expansive soils based on multi-indices is established.The classification is easy and reliable.