中文摘要：

采用中型三轴试验仪,对堆石料进行了各向等压条件下与偏应力条件下的干湿循环试验,探究堆石料在浸水湿化和排水干燥循环过程中的变形特性以及应力状态对堆石料干湿循环变形的影响。试验结果表明：在各向等压条件下,较低围压时,干湿循环过程中的湿化体变量随围压的增加而增加,较高围压时,不呈现此规律;且湿化体应变主要发生在初次浸水饱和的过程中。偏应力条件下,湿化变形的方向与发生湿化时加载变形的方向一致,而排干过程中变形的方向朝体缩方向发生明显偏转,可能主要发生流变变形;初次浸水湿化变形的变形量非常显著,在试验条件下初次湿化轴变量与总湿化轴变量的比值为75%~95%;较低围压时,初次湿化轴变量随着围压与应力水平的增加而增大,而较高围压时随围压的变化不符合此规律。堆石料试样在干湿循环过程中发生的变形（体应变与轴向应变）随循环次数逐渐增加,并趋于稳定,可用双曲线模型来表示试样干湿循环变形随循环次数的变化。

英文摘要：

Series of cyclic drying-wetting tests have been performed under isotropic and deviator stress conditions using a medium-size triaxial test apparatus to study the deformation characteristics of rock-fill material under cyclic drying-wetting and the influence of stress state. The experimental results show that in the condition of isotropic stress, the wetting volumetric strain of rock-fill under low confining pressure increases with increasing confining pressure while its variation under high confining pressure does not follow this trend, and such wetting volumetric strain mainly occurs in initial wetting process. In the condition of deviator stress, wetting deformation takes a direction consistent with that of loading deformation at the initial wetting stage, while deformation during drying evidently turns its direction toward that of volumetric shrinkage, consistent with the characteristics of creep deformation. The wetting deformation at the initial stage dominates and the ratio of initial wetting axial strain over total wetting axial strain is about 75% ~ 95%. Under low confining pressure, initial wetting axial strain increases with an increase in confining pressure or stress level; under high confining pressure, its trend of variation with confining pressure is different. During cyclic drying-wetting, the deformation of rock-fill specimens（including volumetric and axial strains） increases gradually with time and tends toward a stable limit value. A hyperbolic model is recommended for description of the relationship of specimen deformation versus the number of cycles.