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人工降雨条件下黄土斜坡土体孔隙水压力测试研究

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Keywords: 道路工程,黄土斜坡,孔压变化规律,人工降雨,降雨强度,降雨时间,土层深度

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Abstract:

为探讨降雨作用下黄土坡体内孔隙水压力变化规律,选取了户县牛角沟典型黄土斜坡进行现场人工降雨试验和孔隙水压力测试。试验结果表明,在人工降雨条件下坡体内孔隙水压力受降雨强度、降雨时间、坡体土层厚度的影响。在日降雨量274mm,持续4d以上的降雨作用下,2.0m以上的浅层坡体孔隙水压力值由表及里依次减小,孔隙水压力增幅逐次减少,降雨期间孔隙水压力表现出明显滞后现象,0.4m处滞后期为10h,其下土层滞后期延长;2.0m以下土体孔隙水压力不受人工降雨影响。降雨停止后孔隙水压力由内向外逐次消减,24h内孔隙水压力降低最为迅速,2~3d内逐渐减缓,随后逐步趋于稳定。

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