摘要
为更加快捷、准确地进行膨胀土分类,基于燕尾突变模型,选用标准吸湿含水率、自由膨胀率和塑性指数作为评判指标,提出了一种新的膨胀土分类方法。首先,收集整理了若干具代表性的膨胀土分类实例,在对该实例集数据进行无量纲化处理的基础上,采用归一公式进行综合量化计算,求出各土样实例的突变级数,进而结合土样的实际类别划分确定了不同膨胀土类别对应的突变级数区间,最后通过回代检验和泛化能力测试证明其可行性与有效性。研究表明:1)采用突变级数可较好地量化膨胀潜势这一定性概念;2)依据所提方法进行膨胀土分类准确率较高,评价计算过程简便易行,能避免发生指标赋权和同一土样依不同指标分类结果不同的现象。
In order to classify expansive soil quickly and accurately,the standard moisture absorption rate,free expansion rate and plasticity index are selected as the evaluation indicators and a new classification method for expansive soils is proposed based on the swallowtail catastrophe model.First,a number of representative examples of expansive soil are collected and compiled.Second,the comprehensively quantitative calculation is performed by using the normalized formula to obtain the catastrophe progression of each soil sample based on the dimensionless processing of the data of the example set.Furthermore,the categorical interval of different expansive soil types is determined by the actual classification of soil samples.Finally,the feasibility and effectiveness of the proposed method are verified by the back-test and generalization ability tests.The research shows that:1)the qualitative concept of expansion potential can be well quantified by using the catastrophe series value;2)the proposed method is characterized by high accuracy,easy evaluation and calculation,and can avoid the phenomenon of different classification results of the index weighting and the same soil sample according to different indexes.
作者
高岭
李建朋
李雪校
GAO Ling;LI Jianpeng;LI Xuexiao(Hebei Provincial Communications Planning and Design Institue,Shijiazhuang 050011,China;China Solibase Engineering Co.,Ltd.,Beijing 101300,China)
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2021年第4期325-331,共7页
Engineering Journal of Wuhan University
基金
河北省交通运输厅科技项目(编号:20130012)。
关键词
膨胀土
分类
燕尾突变模型
标准吸湿含水率
自由膨胀率
塑性指数
expansive soil
classification
swallowtail catastrophe model
absorption standard moisture
free expansion rate
plasticity index
