Heterogeneities of grain boundary contact for simulation of laboratory-scale mechanical behavior of granitic rocks

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外文摘要：From a practical point of view,grain structure heterogeneities are key parameters that control the rock response and still remains a challenge to incorporate in a quantitative manner.One of the less discussed topics in the context of the grain-based model(GBM)in the particle flow code(PFC)is the contact heterogeneities and the appropriate contact model to mimic the grain boundary behavior.Generally,the smooth joint(SJ)model and linear parallel bond(LPB)model are used to simulate the grain boundary behavior.However,the literature does not document the suitability of different models for specific problems.Another challenge in implementing GBM in PFC is that only a single bonding parameter is used at the grain boundaries.The aim of this study is to investigate the responses of a laboratory-scale specimen with SJ and LPB models,considering grain boundary heterogeneous and homogeneous con-tact parameters.Uniaxial and biaxial compression tests are performed to calibrate the response of Creighton granite.The stress-strain curves,volumetric dilation,inter-crack(crack in the grain bound-ary),and intra-crack(crack within the grain)development,and failure patterns associated with different contact models are examined.It was found that both the SJ and LPB models can reproduce the pre-peak behavior observed for a granitic rock type.However,the LPB model is unable to reproduce the post-peak behavior.Due to the large interlocking effect originating from the balls in contact and the ball size in the LPB model,local dilation is induced at the grain boundaries.This overestimates the volumetric dilation and residual shear strength.The LPB model tends to result in discontinuous inter-cracks and stress localization in the rock specimen,resulting in fine fragments at the rock surface during failure.

外文关键词：

Grain boundary contactSmooth joint(SJ)modelLinear parallel bond(LPB)modelContact heterogeneitiesParticle flow code(PFC)Granitic rock

作者：

Xiongyu Hu、Marte Gutierrez、Zhiwei Yan

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作者单位：

Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu,610031,China

University Transportation Center for Underground Transportation Infrastructure,Colorado School of Mines,Golden,USA

School of Civil Engineering,Southwest Jiaotong University,Chengdu,610031,China

基金：

University Transportation Center for Underground Transportation Infrastructure(UTC-UTI)at the Colorado School of MinesFundamental Research Funds for the Central Universities

项目编号：

69A3551747118A0920502052401-210

出版年：

2024

DOI：

10.1016/j.jrmge.2023.11.018

岩石力学与岩土工程学报(英文版)

中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD

影响因子：0.404

ISSN：1674-7755

年,卷(期)：2024.16(7)