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随着西部公路建设的快速发展和公路等级的提高,出现了更多的高填方路基及桥涵等构造物。为了验算高填方路基及桥涵等构造物的整体强度和稳定性,需要预测非饱和地基土的抗剪强度,而通过土水特征曲线预测非饱和土的抗剪强度方便实用,故此土水特征曲线试验及拟合技术研究具有重要的工程实用价值。本文系统地介绍了土水特征曲线的基本特点、常用的经验公式、渗析法的基本原理及操作步骤、曲线拟合的实用方法。试验和曲线拟合的成功经验可为同类试验作借鉴,试验所得土水特征曲线成果可为工程实践提供参考。
With the rapid development of the western highway construction and the improvement of the highway level, more high-filled subgrade and bridges and culverts appear. In order to check the overall strength and stability of high embankment and bridges and culverts, it is necessary to predict the shear strength of unsaturated soils, and it is convenient and practical to predict the shear strength of unsaturated soils by the soil-water characteristic curves. Therefore, Curve test and fitting technology research has important engineering practical value. This paper systematically introduces the basic characteristics of soil-water characteristic curve, commonly used empirical formula, the basic principles and operation of dialysis method, the practical method of curve fitting. The successful experience of experiment and curve fitting can be used for reference for similar experiments. The results of the soil-water characteristic curve obtained from the experiment can provide reference for engineering practice.