【摘要】：花崗巖風(fēng)化殼水分及收縮特性的研究是花崗巖土體穩(wěn)定性評(píng)價(jià)及侵蝕機(jī)理研究的基礎(chǔ)。通過(guò)Van Genuchten(VG)模型對(duì)不同風(fēng)化程度的花崗巖土壤的顆粒累積分布、土水特征曲線和收縮特征曲線進(jìn)行擬合,分析曲線擬合參數(shù)間以及這些參數(shù)與基本物理性質(zhì)間的線性及非線性相關(guān)關(guān)系。結(jié)果表明:VG模型可以很好地用于不同風(fēng)化程度花崗巖風(fēng)化土的顆粒組成、土水特征與收縮特征的擬合與預(yù)測(cè);曲線擬合參數(shù)間具有一定的線性相關(guān)關(guān)系;曲線擬合參數(shù)與基本物理性質(zhì)間具有一定的線性相關(guān)關(guān)系,其中土水特征曲線參數(shù)與土壤質(zhì)地以及容重線性相關(guān)性較高,收縮特征曲線物理參數(shù)與基本物理性質(zhì)間的線性相關(guān)性較收縮特征曲線其他參數(shù)高。此外,曲線擬合參數(shù)間以及這些參數(shù)與基本物理性質(zhì)間具有一定的非線性相關(guān)關(guān)系,而關(guān)系多為二次、三次非線性相關(guān)。根據(jù)花崗巖風(fēng)化土顆粒組成狀況及其基本物理性質(zhì)對(duì)其水分特征曲線及收縮特征曲線進(jìn)行預(yù)測(cè)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.
【作者單位】： 華中農(nóng)業(yè)大學(xué)資源與環(huán)境學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41630858)資助~~
【分類號(hào)】：S152

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