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基于随机散粒体(SGDD)模型的变形体离散元法和基于PFC圆球颗粒模型分别对堆石体进行真三轴数值试验,研究了多面体颗粒和圆球颗粒两种不同颗粒形状对堆石体真三轴数值试验力学特性的影响,并结合堆石体的实际受力特性对数值试验结果做了相关探讨。结果表明,基于SGDD模型的多面体颗粒堆石体的抗剪强度明显高于基于PFC圆球颗粒的堆石体强度,但其弹性模量小于后者;多面体颗粒堆石体的剪缩特性明显,但随围压的增大,其剪缩变化无圆球颗粒堆石体剪缩变化明显;多面体颗粒能较真实地反映堆石的实际形态,亦能较真实地模拟堆石体的实际强度,即堆石体强度取决于堆石间的摩擦力和咬合力,而圆球颗粒无法模拟。
The true triaxial numerical experiment of rockfill body based on the deformable body discrete element method based on random granularity (SGDD) model and PFC spherical particle model respectively studied the influence of two different particle shapes of polyhedral particles and spherical particles on the rockfill Body true three-axis numerical test of mechanical properties, combined with the actual force characteristics of the rockfill on the numerical test results are discussed. The results show that the shear strength of the polyhedron granular rockfill body based on the SGDD model is obviously higher than that of the rockfill body based on PFC spherical particles, but its elastic modulus is smaller than that of the latter. The shrinkage and shrinkage characteristics of the polyhedral granule rockfill body are obvious, However, with the increase of confining pressure, the shrinkage change of the non-spherical granular rockfill body changes obviously. The polyhedral particle can more accurately reflect the actual shape of the rockfill, and can more accurately simulate the actual strength of the rockfill body, That is, the strength of rockfill depends on the friction and bite force between the rockfill, and the spherical particles can not be simulated.