基于膨胀土物化特性的判别分类方法

A novel identification and classification standard for expansive soil based on its physicochemical indexes

为了建立膨胀土的物化特性判定分析方法,采用物化特性指标pH、Zeta电位、比表面积、阳离子交换量和电导率,结合南宁市周边工程,对采集土样的物化特性指标及力学指标进行分析对比,采用Fisher法对采集的膨胀土物化特性指标进行判别分类,结果表明:1物化特性指标仪器分析简单,数据准确,重现性好;2膨胀土的物化特性指标和力学指标之间具有一定的相关性,可以使用膨胀土的物化指标对膨胀土进行判别分类;3采用Fisher判别分析方法得到的基于膨胀土物化特性的分类方法,可以对南宁地区的膨胀土进行准确的判定和分类。

In order to establish a novel identification and classification standard,the physicochemical indexes of expansive soil,such as p H,Zeta potential,specific surface area,cation exchange capacity and electrical conductivity are used. Therefore,based on the physicochemical properties of expansive soil and some engineering projects in Nanning,discriminant analysis on soil samples for swelling potential utilizing Fisher＇s analysis was carried out,and conclusions are drawn as follows：1 the standard has the advantages of simplified analysis,accurate data and good reproducibility;2 there is a certain correlation between mechanical indexes and physicochemical indexes,and the physicochemical indexes could be used to classify expansive soil; 3 tests on physicochemical indexes of soil were carried out,from which the identification and classification of expansive soil have been proved.