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考虑块石形状为球体、正方体和长方体三种情况,通过正方体与球体相比较来探究块石不同棱角度对胶结土石混合体力学特性的影响,通过长方体与正方体相比较来探究块石不同球度对胶结土石混合体力学特性的影响.首先,基于不规则颗粒三维离散元精细模拟技术实现了正方体和长方体块石数值模型的建立;然后建立含石量为30%和80%的块石形状分别为球体、正方体和长方体的胶结土石混合体三维离散元随机结构模型;最后,对土石混合体大三轴试验进行颗粒流数值模拟,获得了不同含石量、不同块石形状下胶结土石混合体的强度特征和变形特征,并分别就低、高两种含石量下块石形状对土石混合体力学特性影响的细观机理进行了深入地分析.结果表明:块石含量和形状均会显著影响胶结土石混合体的力学特性,并且两者间具有复杂的交互作用;微裂纹、块石颗粒平均旋转量、应变能和摩擦功等的演化规律能够很好地从细观水平上反映块石形状影响的作用机理.
Considering the shape of block stone as sphere, cube and cuboid, the influence of different angularity of block stone on the mechanical properties of cemented stone-soil mixture is probed by comparison between cube and sphere. By comparing cuboid with cube, On the mechanical properties of cemented-rock-soil mixture.Firstly, the numerical simulation of cube-shaped block and rectangular parallelepiped block stone was realized based on the three-dimensional irregular particle fine simulation technique. Then, the stone shape with the stone content of 30% and 80% Which is a three-dimensional discrete element random structure model of the cemented stone-soil mixture of sphere, cube and rectangular parallelepiped. Finally, the numerical simulation of particle flow is carried out on the large triaxial test of the earth-rock mixture. And the meso-scale mechanism of the influence of rock mass shape on the mechanical properties of soil-rock mixture under low and high rock mass contents were analyzed in depth.The results show that both the content and the shape of rock mass are significant Affect the mechanical properties of cemented rock and stone mixture, and have a complex interaction between the two; micro-cracks, stone particles level Both the rotation amount, strain energy, friction work and so on can well reflect the action mechanism of stone block shape from the meso-level.