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用土水特征曲线分析膨胀土的改良效果

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Keywords: 道路工程,非饱和土,土水特征曲线,膨胀土,化学改良,效果评价

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Abstract:

为建立非饱和土理论与工程问题的联系,探讨用土水特征曲线来评价膨胀土的改良效果。将石灰、粉煤灰2种改良剂(均用4种掺量)掺入百色膨胀土,开展自由膨胀率试验,同时按改进葡式击实法确定的各改良土最佳含水率制备试样,通过压力板仪完成脱湿土水特征曲线试验(吸力范围5~1000kPa),获得不同改良土的膨胀性及土水特征曲线线系。基于非饱和土理论并参照膨胀土判别的国家标准,采用VG模型进行曲线拟合后,分析不同改良剂及掺量对土水特征曲线的影响,发现可用饱和重力含水率、进气值、残余含水率和曲线斜率4个指标来评价膨胀土的改良效果。进一步的分析研究表明,4个指标中只要3个满足要求就能确定该土已达改性目的,其中饱和重力含水率是必备指标,其余3指标只需满足2个即可。

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