基于离散元法的三轴试验数值仿真分析  

Numerical Simulation Analysis of Triaxial Tests Based on Discrete Element Method

作　　者：孙元鹏 SUN Yuanpeng(Guangdong Lichen Construction Engineering Co.,Ltd.,Guangzhou 510641,Guangdong)

机构地区：[1]广东立宸建筑工程有限公司,广东广州510641

出　　处：《湖南工业职业技术学院学报》2024年第5期6-10,共5页Journal of Hunan Industry Polytechnic

摘　　要：基于离散元法的思想,利用Fish语言编写程序在PFC软件上实现了三轴试验的数值模拟。实现了土体细观参数和宏观参数的标定,对于内摩擦角2°-30°的土体,可以从文章的数值模拟结果中找到大致对应的细观参数。得出细观摩擦系数、法向粘结强度和切向粘结强度等细观参数会影响应变的峰值强度与宏观内摩擦角和粘结力,细观摩擦系数与内摩擦角成正相关,与粘结力成负相关。根据数值模拟的结果,提出粘结力与细观摩擦系数关系公式和内摩擦角与细观摩擦系数关系公式,利用室内试验结果验证了拟合公式的准确性和可行性。Based on the idea of the discrete element method,the numerical simulation of the triaxial test was realized by using the Fish programming language in PFC software.The calibration of the soil micro-parameter and the macro-parameter is realized.For the soil mass which is 2 degrees to 30 degrees of internal friction angle,the corresponding micro-parameter can be found in the numerical simulation results.It is concluded that the micro friction coefficient,the normal bond strength and shear bond strength will affect the peak strength of the strain,and the micro friction coefficient is positively correlated with the internal friction angle,and is negatively correlated with the bond strength.Based on the numerical simulation results,two formulas are presented,one is the relationship between the bond strength and the micro friction coefficient,and the other is the relationship between the internal friction angle and the micro friction coeffcient.The accuracy and feasibility of the fitting formula were verified using indoor test results.

关 键 词：离散元法 PFC3D 三轴试验 细观参数 宏观参数 

分 类 号：TU411[建筑科学—岩土工程]