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基于MK模型推算非饱和膨胀土土-水特征曲线

Keywords: 道路工程,MK模型,非饱和膨胀土,土-水特征曲线,吸力

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Abstract:

根据非饱和膨胀土基本土性参数,应用MK模型推算非饱和土土-水特征曲线。模型把毛细管力和粘附力相耦合,二者均会诱发吸力的变化。并在西安—汉中高速公路(GZ40)槐树关段K5+120取膨胀土土样,测定基本土性参数。结果表明毛管力的饱和度Sc在低吸力值时起到重要的作用,而当毛细水散失,粘附力的饱和度Sa起到决定性作用。与采用离心试验确定的土-水特征曲线相比较,基于MK模型根据基本土性参数推算非饱和膨胀土土-水特征曲线,其推算值与实测值较为接近,推算与实测土-水特征曲线形状相吻合。

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