膨胀土分类的分形插值评价方法  

Fractal Interpolation-Based Method for Expansive Soil Classification

作　　者：赵月平 

机构地区：[1]河南省新开元路桥工程咨询有限公司,河南郑州450016

出　　处：《人民黄河》2015年第6期91-94,共4页Yellow River

基　　金："十二五"国家科技支撑计划项目(2011BAJ08B05)

摘　　要：膨胀土胀缩等级的判别与分类是在膨胀土地区建设工程首要进行的工作,准确评价膨胀土所处的分类状态,可为工程设计和施工提供合理的参数和科学依据。选取影响膨胀土评价的液限、胀缩总率、塑性指数、天然含水率、自由膨胀率等5个主要因素,依据膨胀土分类标准,采用随机插值生产40个标准样本构建膨胀土分类的分形插值模型,并根据最大似然分类原则计算各个指标的分维数;同时结合样本综合评价值与经验等级之间的关系分析建立分形插值评价模型。通过实例分析表明,该方法简单、可靠,计算得到的每个样本具体得分值及等级优劣顺序合理,且精度可满足工程应用要求。The classification of the grade of shrink and expansion for the expansive soils is very important work for constructions in expansive soil area. Accurate evaluation of the estate of expansive soil may provide scientific data and basis for the prevention of engineering design and construction. This paper brought forward the classification method for expansive soil based on fractal interpolation theory. Firstly, five inde- xes were selected as the factors for synthetic evaluation of expansive soil. In addition, forty standard samples were produced by the way of stochastic interpolation on the basis of classification standard. Secondly, through calculating the fractal dimension of single index of expansive soil, it confirmed the fractal dimension exponent evaluation of the index of single expansive soil with the maximum likelihood classification principle. Thirdly, adopting weighted summation value this method established the fraetal interpolation evaluation model according to the re- lationship between the value of comprehensive evaluation of the samples and the experience level. Finally, several samples were classified and its results are consistent with other methods and show that the model we made is simple and can get accurate solutions, and then can be used widely in the classification of expansive soil.

关 键 词：膨胀土 胀缩等级 分形插值模型 分维数 

分 类 号：TU457[建筑科学—岩土工程]