Strength and deformation behaviors of rockfill materials, key factors for determining the stability of dams, pertain strongly to the grain crushing characteristics. In this study, single-particle crushing tests were carried out on rockfill materials with nominal particle diameters of 2.5 mm, 5 mm and 10 mm to investigate the particle size effect on the single-particle strength and the relationship between the characteristic stress and probability of non-failure. Test data were found to be described by the Weibull distribution with the Weibull modulus of 3.24. Assemblies with uniform nominal grains were then subjected to one-dimensional compression tests at eight levels of vertical stress with a maximum of 100 MPa. The yield stress in one-dimensional compression tests increased with decreasing the particle size, which could be estimated from the single-particle crushing tests. The void ratio-vertical stress curve could be predicted by an exponential function. The particle size distribution curve increased obviously with applied stresses less than 16 MPa and gradually reached the ultimate fractal grading. The relative breakage index became constant with stress up to 64 MPa and was obtained from the ultimate grading at the fractal dimension ($\alpha =2.7$). A hyperbolical function was also found useful for describing the relationship between the relative breakage index and input work during one-dimensional compression tests.

堆石料的强度和变形特性是决定大坝稳定性的关键因素，与谷物的破碎特性密切相关。在这项研究中，对标称粒径为2.5 mm，5 mm和10 mm的堆石料进行了单颗粒破碎试验，以研究颗粒尺寸对单颗粒强度的影响以及特征应力与发生概率之间的关系。无故障。发现测试数据由具有3.24的威布尔模量的威布尔分布描述。然后将具有均匀标称晶粒的组件在最大100 MPa的八个垂直应力水平下进行一维压缩测试。一维压缩试验中的屈服应力随着粒径的减小而增加，可以通过单颗粒破碎测试进行估算。空隙率-垂直应力曲线可以通过指数函数来预测。当施加应力小于16 MPa时，粒度分布曲线明显增加，并逐渐达到最终的分形等级。相对破损指数在最大64 MPa的应力下变得恒定，并且是从分形维数的最终等级获得的（$\alpha =2.7$）。还发现双曲线函数对于描述一维压缩测试期间相对破损指数和输入功之间的关系很有用。