混凝土劈裂抗拉试验的离散元数值模拟细观参数研究  

Meso-parameters Analysis of Discrete Element Numerical Simulation of Concrete Splitting Tensile Test

作　　者：杨凯龙 郭鸿[1,3] 谢晓龙 王雅 杜甜甜 程月新 罗滔 蒋红 YANG Kailong;GUO Hong;XIE Xiaolong;WANG Ya;DU Tiantian;CHENG Yuexin;LUO Tao;JIANG Hong(School of Civil Engineering and Architecture,Shaanxi University of Technology,Hanzhong,Shaanxi 723001,China;Student Research Society of Human Settlements,Shaanxi University of Technology,Hanzhong,Shaanxi 723001,China;Research Center of Geotechnical Environment and Geological Hazards Control in Qinling-Daba Mountains,Shaanxi University of Technology,Hanzhong,Shaanxi 723001,China;School of Water Resources and Building Engineering,Northwest A&F University,Yangling,Shaanxi 712100,China;School of Civil Engineering,Xijing University,Xi′an,Shaanxi 710123,China)

机构地区：[1]陕西理工大学土木工程与建筑学院,陕西汉中723001 [2]陕西理工大学人居环境科研学社,陕西汉中723001 [3]陕西理工大学秦巴山地岩土环境与灾害防治研究中心,陕西汉中723001 [4]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [5]西京学院土木工程学院,陕西西安710123

出　　处：《水利与建筑工程学报》2024年第4期29-34,41,共7页Journal of Water Resources and Architectural Engineering

基　　金：陕西省重点研发计划项目(2023-YBSF-324);陕西省教育厅服务地方专项计划项目(23JC019);陕西理工大学科研能力提升专项项目(SLGNL202415);陕西理工大学研究生创新基金项目(GFC2403)。

摘　　要：基于颗粒流软件PFC^(3D)研究细观参数对混凝土劈裂抗拉试验应力-应变曲线的影响,为离散元数值模拟的细观参数标定提供理论依据。通过控制变量法,研究摩擦系数μ、平行黏结模型的有效模量E~*、黏聚力c、拉应力σ_c、摩擦角φ和法向阻尼率β_(n)等细观参数对混凝土劈拉试验的影响。研究结果表明:平行黏结模型的有效模量E~*对宏观弹性模量的影响显著。随着有效模量的增加,宏观弹性模量逐渐增大,有显著的线性关系;平行黏结模型的黏聚力c、拉应力σ_c和摩擦角φ决定了宏观材料的峰值强度。其中拉应力σ_c和摩擦角φ的影响较小,黏聚力c对峰值强度具有决定性作用。随着黏聚力c增大,峰值强度线性增加;摩擦系数μ和法向阻尼率β_(n)对应力-应变曲线的影响可忽略不计。研究成果对快速、合理的确定混凝土数值模拟中平行黏结模型细观参数标定具有参考价值。Based on the particle flow software PFC^(3D),the influence of mesoscopic parameters on the stress-strain curve of concrete splitting tensile test is analyzed,which provides a theoretical basis for the calibration of mesoscopic parame-ters of discrete element numerical simulation.The influence of micro parameters such as friction coefficient,effective modulus of parallel bonding model,cohesive force,tensile stress,friction angle,and normal damping rate on the re-sults of concrete splitting tensile test was investigated by controlling variables.The research results indicate that the ef-fective modulus of the parallel bonding model has a significant impact on the macroscopic elastic modulus.As the ef-fective modulus increases,the macroscopic elastic modulus gradually increases,showing a significant linear relation-ship.The cohesion,tensile stress,and friction angle of the parallel bonding model determine the peak strength of mac-roscopic materials.The influence of tensile stress and friction angle is relatively small,while cohesion plays a decisive role in the peak strength.As the cohesion increases,the peak strength increases linearly.The influence of friction co-efficient and normal damping rate on the stress-strain curve can be ignored.The research results are of great signifi-cance for quickly and reasonably determining the micro parameter calibration of parallel bonding models in concrete nu-merical simulation.

关 键 词：劈裂抗拉 离散元数值模拟 平行黏结模型 细观参数 应力-应变 

分 类 号：TU452[建筑科学—岩土工程]