3D random reconstruction of meso-structure for soil-rock mixture and numerical simulation of its mechanical characteristics by particle flow code
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摘要: 土石混合体是一种非连续、非均质、各向异性的土石混合多相介质,其力学性质极为复杂,与内部土石细观结构密切相关。从细观结构层次出发,运用计算机随机模拟技术,建立了一种基于不规则块石的土石混合体三维细观结构重构方法,并基于FORTRAN语言开发了相应的三维细观结构随机模拟系统（RMS3D）,在此基础上,考虑块石的不规则形状,建立了土石混合体的离散元模型,并采用颗粒流程序对其开展了不同法向应力下三维直剪试验模拟,探究了块石空间分布对其力学特性的影响。研究结果表明：土石混合体的力学性质受内部块石空间分布影响显著,在相同级配和含石量下,不同块石空间分布的土石混合体试样的剪应力-剪切位移曲线和法向位移-剪切位移曲线均不相同,尤其是在峰后呈现出了明显的差异,且后者开始出现差异时相对于前者滞后;另外,受剪切面上块石阻碍的影响,由于试样内部块石空间石分布的不同,导致不同试样剪切破坏后所形成的剪切带的形态和厚度也存在一定的差异。Abstract: The soil-rock mixture (S-RM) is a discontinuous, heterogeneous and anisotropic multiphase medium consisting of soil and rock blocks. Its mechanical characteristics are extremely complicated and closely related to the internal mesoscopic structure of soil and rock blocks. From the view of meso-structure, a reconstruction method by computer random simulation is proposed to reconstruct the 3D meso-structure for S-RM based on irregular rock blocks, and a randomly modelling system (RMS3D) is developed using the FORTRAN language. On this basis, the discrete element models for S-RM are established considering the shape of irregular rock blocks, and 3D numerical shear tests by particle flow code are conducted for them to investigate the influences of spatial distribution of rock blocks on the mechanical characteristics of S-RM. The results show that the mechanical characteristics are significantly affected by the spatial distribution of rock blocks. The shear stress-displacement and normal displacement-displacement curves are different for S-RM samples with the same content and gradation but different spatial distributions of rock blocks, especially for the post-peak curves, they show obvious differences between each other, and the latter lags behind the occurrence of differences compared to the former. In addition, the shapes and thicknesses of shear zones after failure exhibit certain differences for S-RM samples with different spatial distributions of rock blocks because of the effect of obstruction of the rock blocks located on the shear surface.
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