摘要
针对目前颗粒流方法(PFC)常用的标准结合粒子模型(BPM)存在的问题,应用了一种新的脆性簇平行黏结模型来考虑脆性花岗岩中不规则矿物颗粒的强咬合作用,以模拟花岗岩的高强度比值(单轴抗压强度与抗拉强度之比)和脆性破裂特征.研究了脆性簇平行黏结模型中几个主要微观参数与模拟材料宏观性质的关系,并据此提出了该模型的一种新的标定流程.采用声发射监测花岗岩室内单轴压缩试验裂纹扩展过程,同时利用本文提出的标定流程对花岗岩进行标定,观察到室内试验与标定模型破坏过程基本一致,标定误差在3%以内,验证了本文提出的标定流程的有效性和该模型模拟过程的可靠性.
Aiming at the problems of the Bonded Particle Mode(l BPM)commonly used in the current Particle Flow Code(PFC),a new brittle cluster parallel bonding model is applied to consider the strong bite interaction of irregular mineral particles in brittle granite to simulate the high strength ratio(ratio of uniaxial compressive strength to tensile strength)and brittle fracture characteristics of granite.In this paper,the relationship between several main micro parameters in the brittle cluster parallel bonding model and the macro properties of the simulated material is studied,and a new calibration process for the model is proposed accordingly.Acoustic emission was used to monitor the crack growth process of the granite indoor uniaxial compression test.At the same time,the granite was calibrated using the calibration process proposed in this paper.It was observed that the damage process of the indoor test and the calibration model were basically the same,and the calibration error was within 3%.The validity of the calibration process proposed in this paper and the reliability of the model simulation process are verified.
作者
武鑫星
黄兴
王俊杰
张全太
WU Xinxing;HUANG Xing;WANG Junjie;ZHANG Quantai(The 2nd Engineering Company of China Railway 12th Bureau Group,Taiyuan 030032,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;School of Civil Engineering and Architecture,Wuhan University,Wuhan 430072,China)
出处
《河南科学》
2021年第2期266-275,共10页
Henan Science
基金
国家自然科学基金资助项目(41941018,52074258)
国家重点实验室开放基金项目(E01Z440101)。
