Soil-water characteristic curve(SWCC) is an essential parameter for studying the mechanical properties of unsaturated tailings, which plays an important role in stability assessment and prediction of unsaturated tailings dam. In this paper, the matrix suction was measured indirectly by filter paper-based method to investigate the effects of key factors(gradation, temperature and initial dry density)on the soil-water characteristic curves of fine-grained tailings,and the Van Genuchten model was adopted to obtain the empirical equation of SWCC and to verify the accuracy of experimental results.The results showed that: (1) The Van Genuchten model can well-fit the relationship between matric suction and volumetric moisture content of fine-grained tailings,indicating that experimental data determined by filter paper-based method is accurate and appropriate.(2) At the same volumetric moisture content, the matrix suction increased with decreasing average particle size, and the decrease of temperature will increase the matrix suction and water-holding capacity of fine-grained tailings. The matrix suction of the tailings in summer is 38.3% lower than that in winter under the natural volumetric moisture content(14.0%).(3) when the degree of saturation is less than 60%, the greater the initial dry density, the better the water-holding capacity and matrix suction of fine-grained tailings.

中文翻译：

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细粒尾矿土-水特征曲线影响关键因素的试验研究

土水特征曲线(SWCC)是研究非饱和尾矿力学特性的重要参数，在非饱和尾矿坝的稳定性评价和预测中具有重要作用。本文采用滤纸法间接测量基质吸力,研究了关键因素(级配、温度和初始干密度)对细粒尾矿土-水特征曲线的影响,并采用Van Genuchten模型结果表明：（1）Van Genuchten模型能够很好地拟合细粒尾矿的基质吸力与体积含水率之间的关系，(2) 在相同体积含水量下，基质吸力随着平均粒径的减小而增加，温度降低会增加基质吸力和持水量。细粒尾矿的容量。在自然体积含水率（14.0%）下，夏季尾矿基质吸力比冬季低38.3%。（3）饱和度小于60%时，初始干密度越大越好细粒尾矿的持水能力和基质吸力。温度的降低会增加细粒尾矿的基质吸力和持水能力。在自然体积含水率（14.0%）下，夏季尾矿基质吸力比冬季低38.3%。（3）饱和度小于60%时，初始干密度越大越好细粒尾矿的持水能力和基质吸力。温度的降低会增加细粒尾矿的基质吸力和持水能力。在自然体积含水率（14.0%）下，夏季尾矿基质吸力比冬季低38.3%。（3）饱和度小于60%时，初始干密度越大越好细粒尾矿的持水能力和基质吸力。