基于直接生成法的土石混合体三维随机模型构建与数值仿真研究

发布时间：2018-04-14 11:30

本文选题：土石混合体 + 直接法　；参考：《岩土力学》2017年04期

【摘要】：通过对土石粒径界限、块石分布规律与粒径分布频度的研究,基于直接生成法建立了土石混合体的三维随机模型,形成了一套较为完整的、操作性强的三维随机模型构建方法。在此基础上,将三维随机模型构建方法与FLAC~(3D)随机建模方法相结合,建立与真实土石混合体具有相同统计规律的有限差分模型,开展室内直剪数值仿真试验研究,获取了不同垂直压力下的剪应力-位移曲线和相应的剪切带分布,探讨了土石混合体的剪切破坏特性与土石相互作用机制。剪切过程中由于土体产生的不同程度的剪切变形以及块石在摩擦作用下发生的水平或旋转运动,导致土石混合体的剪切带表现出明显的不规则和不连续特点,其剪应力-位移曲线具有应变硬化特点。研究表明,三维随机模型能够反映土石混合体的宏观力学性质和细观破坏机制,可作为力学性质研究的有效载体。
[Abstract]:Based on the study of the boundary of soil and rock particle size distribution and the frequency of particle size distribution the three-dimensional random model of soil-rock mixture is established based on the direct generation method and a set of relatively complete and highly operable three-dimensional random model construction method is formed.On this basis, a finite difference model with the same statistical law as the real soil-rock mixture is established by combining the 3D stochastic modeling method with the FLACU 3D) stochastic modeling method, and the indoor direct shear numerical simulation experiment is carried out.The shear stress-displacement curves and the corresponding shear zone distributions are obtained under different vertical pressures. The shear failure characteristics of soil-rock mixtures and the mechanism of soil-rock interaction are discussed.Due to the shear deformation of soil and the horizontal or rotational movement of rock mass under friction, the shear zone of soil-rock mixture appears to be irregular and discontinuous.The shear stress-displacement curve is characterized by strain hardening.The results show that the three-dimensional stochastic model can reflect the macroscopic mechanical properties and the mesoscopic failure mechanism of soil-rock mixture and can be used as an effective carrier for the study of mechanical properties.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：NSFC-云南联合基金重点支持项目(No.U1402231) 国家重点基础研究发展计划(973)项目(No.2015CB057905) 国家自然科学基金面上项目(No.51279202)~~
【分类号】：TU43

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