Calibration method of mesoscopic parameter in sandy cobble soil triaxial test based on PFC3D  

作　　者：Pengfei LI Xiaopu CUI Yingjie WEI Junwei XIA Xinyu WANG 

机构地区：[1]Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China [2]China Railway 14th Bureau Group Co.,Ltd.,Jinan 250014,China [3]China Railway 19 Bureau Group Rail Traffic Engineering Co.,Ltd.,Beijing 101399,China [4]School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,China

出　　处：《Frontiers of Structural and Civil Engineering》2023年第12期1924-1933,共10页结构与土木工程前沿（英文版）

基　　金：the financial support provided by the National Natural Science Foundation of China(Grant No.51978019);the Beijing Natural Science Foundation(No.8222004).

摘　　要：This paper presents a rapid and effective calibration method of mesoscopic parameters of a threedimensional particle flow code(PFC3D)model for sandy cobble soil.The method is based on a series of numerical tests and takes into account the significant influence of mesoscopic parameters on macroscopic parameters.First,numerical simulations are conducted,with five implementation steps.Then,the multi-factor analysis of variance method is used to analyze the experimental results,the mesoscopic parameters with significant influence on the macroscopic response are singled out,and their linear relations to macroscopic responses are estimated by multiple linear regression.Finally,the parameter calibration problem is transformed into a multi-objective function optimization problem.Numerical simulation results are in good agreement with laboratory results both qualitatively and quantitatively.The results of this study can provide a basis for the calibration of microscopic parameters for the investigation of sandy cobble soil mechanical behavior.

关 键 词：sandy cobble soil particle flow code orthogonal experiment regression analysis multi-objective optimization CALIBRATION 

分 类 号：O57[理学—粒子物理与原子核物理]