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堆石料的湿化变形严重影响心墙堆石坝初蓄水时的安全。通过分析堆石料单线法湿化试验数据发现,堆石料的湿化应力水平与湿化轴向应变成双曲线关系,但也有学者认为是指数函数关系,通过比较发现双曲线关系表述更佳。分析大量单线法试验数据发现,湿化过程中体积应变增量与轴向应变增量的比值保持不变。由此并根据非线性弹性理论,提出了一个堆石料的湿化本构模型,给出了湿化割线模量与湿化泊松比的表达式。与改进的沈珠江湿化模型比较,该湿化模型与试验数据拟合的更好。研究显示,采用传统Prandtl-Reuss流动法则计算得到的湿化应变在高湿化应力水平下偏小。
Wet deformation of rockfill material seriously affects the safety of core rockfill dam at the beginning of impoundment. By analyzing the single-line wetting test data of rockfill, it is found that the wetting stress of rockfill material is hyperbolic with the axial strain of wetting. However, some scholars think it is exponential function, and the hyperbola relationship is better expressed by comparison. Analysis of a large number of single-line test data found that the ratio of volumetric strain increment to axial strain increment remained unchanged during the wetting process. Based on the theory of nonlinear elasticity, a wetted constitutive model of rockfill material is proposed, and the expression of wetting secant modulus and wet Poisson’s ratio is given. Compared with the modified Shenzhu River wetting model, the wetting model is better fitted with the experimental data. Studies have shown that the wetting strain calculated using the traditional Prandtl-Reuss flow law is small at high wet stress levels.