岩石单轴压缩PFC^(2D)模型细观参数标定研究  

Research on the Calibration Method of Microparameters of a Uniaxial Compression PFC^(2D) Model for Rock

作　　者：陈鹏宇[1] 孔莹[2] 余宏明[2] Chen Pengyu;Kong Ying;Yu Hongming(School of Geography ＆ Resource Science,Neijiang Normal University,Neijiang,Sichuan 641100,P.R.China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,P.R.China)

机构地区：[1]内江师范学院地理与资源科学学院,四川内江641100 [2]中国地质大学(武汉)工程学院,武汉430074

出　　处：《地下空间与工程学报》2018年第5期1240-1249,共10页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(41272377);长江科学院开放研究基金(CKWV2016391/KY);四川省教育厅科研项目(17ZB0222)

摘　　要：为了研究单轴压缩PFC^(2D)模型宏细观参数之间的关系及对其细观参数进行标定,以平直节理接触模型作为颗粒接触本构模型,对PFC^(2D)模型细观参数进行正交设计,以多因素方差分析、量纲分析研究宏细观参数之间的关系,在此基础上,提出了试错法标定细观参数的具体流程,将其用于灰岩单轴压缩PFC^(2D)模型细观参数的标定中,数值模拟所得宏观参数、应力-应变曲线和破坏特征与室内试验结果相近,验证了本文方法的可行性。分析结果显示,如果要建立双轴压缩PFC^(2D)模型,还需进一步标定细观参数tanφ_b和μ_b。研究成果可为岩石力学试验的颗粒流模拟提供一定参考。To analyze the relationship between microparameters and macroparameters of the uniaxial compression PFC（2D） model of rock,and to calibrate the microparameters,the orthogonal design and analysis of variance are adopted in this paper. Flat-jointed contact model is used as the contact constitutive model of particles. The orthogonal design is conducted to the microparameters of PFC（2D） model. Then analysis of variance and dimensional analysis is utilized to analyze the relationship between microparameters and macroparameters. On this basis,the process of trialand-error method for calibration of microparameters for rock is proposed and is used to calibrate the microparameters of limestone. Simulation results of macroparameters,stress-strain curves and failure characteristics are closed to the laboratory test results,and this validated the significance of the suggestion for trial-and-error method. If a biaxial compression PFC（2D）model need to build,the two microparameters（ tan φb,μb） need further calibration. The research results can provide references for the particle flow simulation of rock mechanics tests.

关 键 词：颗粒流 平直节理接触模型 岩石 细观参数 标定 试错法 

分 类 号：TU457[建筑科学—岩土工程]