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中文摘要：
甘肃省永靖县黑方台地区灌溉水下渗导致地下水位抬升,加之季节性冻结滞水促滑效应的影响,进而诱发了大量黄土滑坡。为了进一步研究地下水长期作用对黄土强度的影响,采用环剪仪装置开展了不同饱水时间下（1,3,5,7,10,15,20 d）重塑黄土的强度试验研究。试验结果显示,黄土强度饱水时间曲线呈“勺形”,指出“勺底”数值更符合完全软化强度的定义,并且从水、土相互作用的微观角度对曲线形状作出了合理解释。初步认为,该地区饱水3 d左右的抗剪强度接近于完全软化强度。
英文摘要：
The infiltration of irrigation water in Heifangtai loess plateau, Yongjing County Gansu Province, elevates the under- ground water level and triggers dozens of loess landslides due to sliding - promoting effect of seasonal frozen stagnant water. In or- der to study the long term influence of groundwater on strength of loess, the ring shear apparatus was used to study the shear strength variation of saturated remodeled loess with different saturation time （1, 3, 5, 7, 10, 15d and 20d）. The test result shows that the shape of strength - saturation time curve is in the shape of ＂ spoon＂, and the value at the spoon bottom conforms with the definition of fully softened strength. Then the curve shape is analyzed in term of interactions of water and loess in a micro perspective. It is preliminarily concluded that the shear strength of 3d saturated time closes to the fully softened strength in Hei- fangtai area.
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