膨胀土野外速判分级方法研究

Research on quick judgment method of classification of expansive soil in field

为探索膨胀土的野外快速判别方法,以南水北调中线引江济汉工程膨胀土渠坡段为例,选取土体颜色、地层岩性、粘着程度、结核物含量4个野外速判因子,并根据部分已确定的膨胀土分级结果,反分析了各因子的分级敏感度与权重,建立了膨胀土野外快速判定多因子权重专家打分系统。经验证,该专家打分系统可实现膨胀土膨胀潜势的野外快速判别,具有较好的适用性,可为膨胀土地区工程勘察及治理方案的设计提供有益的指导。

In order to explore the quick judgment method for expansive soil in field, we took the expansive soil in a canal pro- ject, a diversion works from Yangtze River to Hanjiang River for Middle Route Project of South to North Water Diversion, as an example. Four factors for quick judgment have been chosen, including color, lithology, adhesion strength and contents of nod- ules. Sensitivities and weights of the factors were obtained through back - analysis based on the some classification results which had been identified ; a multi - factor experts grading system was established for quick identification of expansive soil in field. This system is proved to be effective and feasible in realizing the quick judgment of swelling potential of expansive soil in field.