不同岩性风化物分形特征及其与渗透系数关系研究

发布时间：2018-03-17 14:39

本文选题：泥石流　切入点：风化物　出处：《水土保持研究》2017年05期 　论文类型：期刊论文

【摘要】：为了探讨不同岩性风化物的结构组成和渗透性能,在野外采样和室内分析的基础上,选择小江流域9种岩性风化物作为研究对象,采用分形理论,分析了不同岩性风化物的分形特征及其与渗透系数之间的关系。结果表明:(1)岩性风化物具有显著的分形特征,分形维数值为2.567~2.833,其关系为白云岩砂岩第四纪沉积玄武岩千枚岩泥质灰岩粉砂岩板岩泥岩;(2)分形维数与0.005,0.005~0.05mm的粒径含量呈极显著正相关,与10~20,20~40,40~60mm的粒径含量呈极显著负相关,与其他粒径含量相关性不显著;(3)多元线性回归分析发现,0.05mm的粒径是决定不同岩性风化物分形维数的决定粒径;(4)分形维数与渗透系数呈显著的一次函数关系:y=-276.84x+810.66,分形维数越大,细颗粒物质越多,渗透系数越小,渗透能力越差。因此,分形维数可以作为表征不同岩性风化物粒级组成和渗透性能的参数,可以为泥石流起动发生的研究提供一定的理论依据。
[Abstract]:In order to study the structure composition and permeability of different lithologic weathering materials, based on field sampling and laboratory analysis, nine kinds of lithologic weathering materials in Xiaojiang River Basin were selected as research objects, and fractal theory was adopted. The fractal characteristics of weathered materials of different lithology and their relationship with permeability coefficient are analyzed. The results show that the weathered materials of different lithology have remarkable fractal characteristics. The fractal dimension is 2.567 ~ 2.833, which is related to the Quaternary sedimentary basalt, phyllite, phyllite, limestone, siltstone, slate, mudstone and mudstone. The fractal dimension is positively correlated with the particle size content of 0.005 ~ 0.005 ~ 0. 05 mm, and negatively correlated with the diameter content of 10 ~ (20) ~ (20) ~ (40) 4060mm. Multivariate linear regression analysis showed that the particle size of 0.05mm is the determinant of fractal dimension of different lithologic weathering materials. The fractal dimension has a significant first order function relationship with permeability coefficient, and the fractal dimension is bigger, the larger the fractal dimension is, the larger the fractal dimension is. The more fine particles, the smaller the permeability coefficient and the worse the permeability. Therefore, fractal dimension can be used as a parameter to characterize the particle size composition and permeability of different lithologic weathered materials. It can provide some theoretical basis for the study of debris flow starting.
【作者单位】：内江师范学院地理与资源科学学院;
【基金】：四川省教育厅重点项目(16ZA0312);四川省教育厅科研创新团队基金(14TD0026)
【分类号】：P642.23

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