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非饱和土水分特征曲线特性

, PP. 23-28

Keywords: 道路工程,非饱和土,试验研究,水分特征曲线,基质吸力,含水量

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Abstract:

？为了描述非饱和土基质吸力与含水量的关系特性,进行了室内外土体水分特征曲线(SWCC)测试,分析了试样物质成分、塑性指数、孔隙结构、应力状态等因素对SWCC测试的影响;在自然边坡、挖方边坡、填方边坡上进行了基质吸力变化规律的实测,对比了在不同应力、填土条件下基质吸力变化规律的差异性。研究结果表明:同一土体的SWCC并不惟一;可以通过同条件下的室内吸湿曲线来模拟现场基质吸力和含水量的关系;当基质吸力为100～1000kPa时,SWCC呈线性关系,使得基质吸力监测的可操作性大大提高。

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