红粘土土水特征曲线试验及其数学模型研究

Experimental study and mathematical model of soil-water characteristic curve of red clay

红粘土工程性质的劣化使其发育区路堑边坡的失稳、崩塌、路基不均匀沉降等工程地质问题的产生与爆发在很大程度上都是为水体长期或周期性或突发性作用结果。水的性质、存在形式及其与红土的作用方式、作用程度是影响红土化作用程度及红粘土发育特征、工程性质的关键因素。以三峡库区发育的典型南方红粘土为对象,开展了非饱和土土水特征曲线试验,应用VG模型对土水特征曲线进行预测,在不同状态土体饱和土渗透试验的基础上,应用数学方法对非饱和土渗透特性进行了预测。在此基础上,开展关于红粘土土水特征的研究,研究表明,应用VG数学模型进行非饱和土体土水特征曲线预测拟合精度高,方法可行。

The engineering properties degradation of red clay, its development zone＇s cutting slope instability, collapse, roadbed uneven settlement of such engineering geological problems in a largely caused by the water＇s long-term or cyclical or sudden action results. The properties and existing form of water, its action mode and effect degree with red clay are the key factors in the influence of effect degree, development characteristic and engineering properties of the red clay. This article is targeted at the typical south red clay of the Three Gorges Reservoir area, and develop the soil water characteristic curve experiment to discuss soil water interaction characteristic. Finally take prediction of the soil water features curve with the application of VG model and also take prediction of the saturated soil infiltration in the application of mathematical methods which is based on the various state of the infiltration test of saturated soil. On the basis of this,carry out the research of red clay soil water features. Adopting VG mathematical model to predict the unsaturated soil water characteristic curve fitting is accuracy and feasible.