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以湖南潭邵高速公路 K174～ K186地段所取的 4种膨胀粘土样为例 ,通过大量室内膨胀试验 ,对比研究了膨胀速度曲线、收缩速度曲线的特征。研究结果表明 ,尽管膨胀粘土的膨胀、收缩过程有很多相似特征 ,但两者并非是完全可逆的过程 ,其吸水膨胀速度远比失水收缩速度快。同时 ,利用非线性最小平方拟合法对胀缩曲线进行拟合 ,并给出胀缩曲线的曲线回归方程及其各参数的物理意义。研究结果为膨胀粘土堤坝边坡设计以及膨胀粘土地基加固、处理提供了重要的依据
Taking four kinds of expansive clay samples taken from K174 ~ K186 section of Hunan-Tam-Sha expressway as an example, the characteristics of the expansion velocity curve and the contraction velocity curve were comparatively studied through a large number of indoor expansion tests. The results show that although the swelling and shrinking processes of clay have many similar features, both of them are not completely reversible, and their swelling rate is much faster than that of water loss and shrinkage. At the same time, the nonlinear least squares fitting method is used to fit the expansion and contraction curves, and the curve regression equation of the expansion and contraction curves and the physical meaning of each parameter are given. The results provide an important basis for slope design of expansive clay dams and reinforcement and treatment of expansive clay foundation