花岗岩风化土物理特征曲线间的相关性研究
发布时间：2018-09-11 16:59
【摘要】：花岗岩风化壳水分及收缩特性的研究是花岗岩土体稳定性评价及侵蚀机理研究的基础。通过Van Genuchten(VG)模型对不同风化程度的花岗岩土壤的颗粒累积分布、土水特征曲线和收缩特征曲线进行拟合,分析曲线拟合参数间以及这些参数与基本物理性质间的线性及非线性相关关系。结果表明:VG模型可以很好地用于不同风化程度花岗岩风化土的颗粒组成、土水特征与收缩特征的拟合与预测;曲线拟合参数间具有一定的线性相关关系;曲线拟合参数与基本物理性质间具有一定的线性相关关系,其中土水特征曲线参数与土壤质地以及容重线性相关性较高,收缩特征曲线物理参数与基本物理性质间的线性相关性较收缩特征曲线其他参数高。此外,曲线拟合参数间以及这些参数与基本物理性质间具有一定的非线性相关关系,而关系多为二次、三次非线性相关。根据花岗岩风化土颗粒组成状况及其基本物理性质对其水分特征曲线及收缩特征曲线进行预测具有一定的可行性。
[Abstract]:The study of moisture and shrinkage characteristics of granite weathering crust is the basis of stability evaluation and erosion mechanism of granite soil. The grain accumulation distribution, soil water characteristic curve and shrinkage characteristic curve of granite soil with different weathering degree were fitted by Van Genuchten (VG) model. The linear and nonlinear correlation between curve fitting parameters and basic physical properties is analyzed. The results show that the VG model can be used to fit and predict the particle composition of granite weathered soils with different weathering degrees, the characteristics of soil water and shrinkage, and the curve fitting parameters have a certain linear correlation. The curve fitting parameters have a certain linear correlation with the basic physical properties, and the soil water characteristic curve parameters have a high linear correlation with soil texture and bulk density. The linear correlation between the physical parameters of the shrinkage characteristic curve and the basic physical properties is higher than that of the other parameters of the contraction characteristic curve. In addition, the curve fitting parameters and the basic physical properties of these parameters have a certain nonlinear correlation, but the relationship is mostly quadratic, cubic nonlinear correlation. It is feasible to predict the characteristic curve of moisture and shrinkage of granite weathered soil according to its particle composition and basic physical properties.
【作者单位】： 华中农业大学资源与环境学院;
【基金】：国家自然科学基金项目(41630858)资助~~
【分类号】：S152
本文编号：2237293
[Abstract]:The study of moisture and shrinkage characteristics of granite weathering crust is the basis of stability evaluation and erosion mechanism of granite soil. The grain accumulation distribution, soil water characteristic curve and shrinkage characteristic curve of granite soil with different weathering degree were fitted by Van Genuchten (VG) model. The linear and nonlinear correlation between curve fitting parameters and basic physical properties is analyzed. The results show that the VG model can be used to fit and predict the particle composition of granite weathered soils with different weathering degrees, the characteristics of soil water and shrinkage, and the curve fitting parameters have a certain linear correlation. The curve fitting parameters have a certain linear correlation with the basic physical properties, and the soil water characteristic curve parameters have a high linear correlation with soil texture and bulk density. The linear correlation between the physical parameters of the shrinkage characteristic curve and the basic physical properties is higher than that of the other parameters of the contraction characteristic curve. In addition, the curve fitting parameters and the basic physical properties of these parameters have a certain nonlinear correlation, but the relationship is mostly quadratic, cubic nonlinear correlation. It is feasible to predict the characteristic curve of moisture and shrinkage of granite weathered soil according to its particle composition and basic physical properties.
【作者单位】： 华中农业大学资源与环境学院;
【基金】：国家自然科学基金项目(41630858)资助~~
【分类号】：S152
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