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中文摘要：
首先，基于前人的室内试验数据和随机散粒体不连续变形（SGDD）模型数值试验成果分析尺寸效应对堆石体瞬时变形的影响，结果表明：不考虑堆石体蠕变效应时，在相同的应力状态下，大尺寸试样的抗剪强度及抗变形能力均较小尺寸试样有所提高，表现出更“硬”的特点；其次，分别在尺寸为Ф50cm×100cm（颗粒最大粒径为10cm）和Ф30cm×60cm（颗粒最大粒径为6cm）的应力式三轴仪上进行堆石体蠕变试验，研究堆石体蠕变的尺寸效应，结果表明，尺寸效应对堆石体蠕变特性的影响显著，大尺寸试样的最终蠕变量明显大于小尺寸试样，而尺寸效应对蠕变速率因子五的影响并无明显规律；最后，综合分析尺寸效应对堆石体总变形（瞬时变形＋蠕变变形）的影响，从总体上看，大尺寸试样的总变形大于小尺寸试样。
英文摘要：
Firstly, scale effect on instantaneous deformation of rockfill is studied by experimental data in former studies and numerical tests base on stochastic granule discontinuous deformation（SGDD） model. It is demonstrated that larger specimen shows higher shear strength and initial modulus of elasticity under the same axial stress and confining pressure without considering creep deformation of rockfill. Secondly, two kinds of specimens with different sizes（Ф50 cm× 100 cm（maximum grain diameter is 10 cm） and Ф30 cm×60 cm（maximum grain diameter is 6 cm）） are subjected to stress control triaxial creep tests, which aim to study the scale effects on creep deformation of rockfill. It reveals that scale effect has significant influence on creep property of rockfill. Larger specimens give more creep deformation, but no clear law is found about the scale effect on the factor of creep rate 2. Finally, based on the synthetical analysis of scale effect on total deformation including instantaneous and creep deformations ofrockfill, the total deformation of big specimen is larger than that of the small one as a whole.
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