膨胀土分类的分形插值评价方法
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
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 indexes 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 fractal interpolation evaluation model according to the relationship 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.
引文
[1]余颂,陈善雄,余飞,等.膨胀土判别与分类的Fisher判别分析方法[J].岩土力学,2007,28(3):499-504.
    [2]王涛.路基膨胀土判别标准研究[J].交通标准化,2008(3):35-37.
    [3]蔡奕,王宝军,施斌,等.GIS环境下膨胀土胀缩等级的模糊数学评判[J].工程勘察,2002(2):1-4.
    [4]王广月,马华月,刘健.路基膨胀土胀缩等级的物元可拓识别模型[J].公路交通科技,2005,22(11):30-33.
    [5]张慧颖,曾建民.物元可拓模型的改进及其在膨胀土分类中的应用[J].岩土力学,2008,29(6):1681-1684.
    [6]史秀志,胡海燕,周健.基于信息熵-未确知测度理论的膨胀土胀缩分级评价[J].中南林业科技大学学报,2010,30(4):144-149.
    [7]夏连学,张慧颖.变权靶心贴近度在膨胀土分类中的应用[J].长安大学学报:自然科学版,2008,28(4):32-34.
    [8]邬忠虎,陈筠,刘磊磊,等.膨胀土胀缩等级评价的熵值-理想点模型[J].人民黄河,2014,36(3):106-110.
    [9]王威,田杰,苏经宇,等.围岩稳定性评价的分形-插值模型[J].西安建筑科技大学学报:自然科学版,2012,44(2):204-209.
    [10]王威,苏经宇,马东辉,等.饱和砂土地震液化判别的分形插值模型[J].世界地震工程,2012,38(1):118-214.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心