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Test study on the CBR of lime improved expansive soil after long-term immersion

机译：在长期浸没后石灰CBR改良膨胀土的试验研究

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Filled road embankment along river levee or widen river levee as road embankment is often used in highway construction, part of the embankment will always immerged in water for seepage. The intensity of the filler will decrease due to the long-term immersion, which lead to eventually failure, especially in the expansive areas. This paper carried out CBR test on the lime improved expansive soil after different time's immersion. The test results show: The CBR will linearly decreased with the previous immersion time, and then, it varies very small with the immersion time, and the stable CBR after long term immersion is about 80% of the CBR under standard condition. The paper put forward a prediction model of CBR by the immersion time, it can be used to predict the CBR of improved expansive after long term immersion, and to judge whether it meet the requirements of specification.
机译：沿着河堤或宽阔的道路堤防作为道路堤岸的河流堤防经常用于公路建设，一部分堤防将始终浸入水中进行渗流。由于长期浸渍，填料的强度将降低，这导致最终发生故障，特别是在膨胀区域。本文在不同时间浸泡后对石灰的CBR试验进行了改善的膨胀土。测试结果显示：CBR将随着先前的浸入时间线性降低，然后，在浸渍时间内变化非常小，并且在长期浸没后的稳定CBR在标准条件下约占CBR的80％。本文提出了CBR预测模型的浸入时间，可用于预测长期浸没后改善膨胀的CBR，并判断它是否符合规范的要求。

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