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堆石料具有显著的颗粒破碎和三维形状特性,该特性对材料的整体强度和变形特性的影响不容忽视。为剥离颗粒破碎和三维形状特性对堆石料强度和变形特性的影响,采用玻璃球来近似模拟堆石料,基于中型三轴仪器分析了颗粒组构对强度和变形特性的影响。结果表明:在颗粒破碎不明显的工况下,玻璃球能够近似模拟堆石料的强度和变形特征,颗粒破碎对试样的强度影响要低于其对体积应变的影响;材料的峰值强度随着颗粒直径的增大而增大,体积应变随着颗粒直径的增大而减小;在孔隙比相近的情况下,颗粒级配的变化对材料的强度影响较小,对体积应变影响较大,小颗粒掺入有助于改善级配和控制剪胀变形。
Rockfill has significant particle crushing and three-dimensional shape characteristics, the characteristics of the overall strength and deformation properties of the material can not be ignored. In order to peel off the effect of particle crushing and three-dimensional shape on the strength and deformation characteristics of rockfill materials, glass balls were used to approximate the rockfill materials. The effects of particle structure on strength and deformation properties were analyzed based on medium-sized triaxial apparatus. The results show that the glass ball can approximate the strength and deformation characteristics of the rockfill material under the condition of obvious particle breakage. The influence of the particle breakage on the strength of the sample is lower than that of the rockfill material. The peak intensity of the material increases with With the increase of the particle diameter, the volumetric strain decreases with the increase of the particle diameter. When the void ratio is similar, the change of the particle size distribution has little effect on the material strength and has a great effect on the volume strain. Incorporation of small particles helps to improve gradation and to control dilatancy.