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为研究黏结材料中哪些细观参数是材料力学特性宏观反应的主要影响参数,基于离散元颗粒流理论,以PFC2D为工具,自编程序,以粗粒土为黏结材料作为研究对象,以室内三轴固结排水试验作为基础,通过数值试验模拟三轴室内试验结果,并分析材料中颗粒半径大小、摩擦系数、黏结剂强度对材料宏观力学特性的影响程度。结果表明:用PFC2D模拟三轴试验,模拟结果不能精确吻合试验室内的结果;颗粒半径参数与土体强度的关系为二次函数;摩擦系数直接影响土体的摩擦角的大小,且材料摩擦角在摩擦系数较小时的影响敏感性较强;黏结剂强度直接影响材料的抗剪强度,且抗剪强度与CBSR黏结剂强度化黏呈正线性相关。在黏结剂强度取值在一定范围内,试样压缩裂隙数量随着黏结剂强度的增大而增大。
In order to study which mesoscopic parameters of cemented materials are the main influence parameters of macroscopic reaction of material mechanics, based on discrete element particle flow theory, using PFC2D as tool, self-programmed program and coarse grained soil as bonding material, Axis consolidation drainage test as the foundation, the numerical experiment simulates the results of three-axis indoor test, and analyzes the influence degree of the particle radius, the friction coefficient and the strength of the binder on the macroscopic mechanical properties of the material. The results show that the simulation results of PFC2D can not accurately match the results in laboratory. The relationship between particle radius parameters and soil strength is a quadratic function. The friction coefficient directly affects the size of soil friction angle, and the material friction angle When the friction coefficient is small, the sensitivity is strong. The strength of the binder directly affects the shear strength of the material, and the shear strength is positively correlated with the strength of the CBSR binder. When the strength of the adhesive is within a certain range, the number of compressed fractures of the sample increases with the increase of the strength of the adhesive.