摘要
作为表征动力破碎的重要参数之一,平均破碎块度的研究对于揭示岩石破碎机理具有重要意义。尽管进行了大量理论与实验研究,但是还缺乏从裂纹动力学角度来澄清岩石破碎和块度形成机理。基于动态荷载作用下翼型裂纹扩展模型和J. R. Gladden柱体动力屈曲失稳模型,提出了一种预测岩石平均破碎块度的方法,并探究了应变率对动态强度和平均破碎块度的影响。研究结果表明,随着应变率的增加,动态强度增加,平均破碎块度减小,且应变率依赖性逐渐降低。模型平均破碎块度预测与实验数据吻合良好。
Average fragment size is one of the important parameters characterizing dynamic fragmentation,and the study of the average fragment size is of great significance to reveal the mechanism of rock dynamic fragmentation.Although a lot of theoretical and experimental studies have been conducted by many scholars,the formation mechanism of rock fragmentation has not been revealed from the perspective of crack dynamics.Based on the dynamic crack propagation model of wing cracks and Gladden’s dynamic column buckling instability model,we purpose a method to predict the average fragment size under dynamic loading.The effect of strain rate on the dynamic strength and average fragment size is studied.The results show that with the increase of strain rate,the dynamic strength increases,and the average fragment size and strain rate dependence decrease gradually.The prediction of the average fragment size by the proposed model is in good agreement with the experimental data.
作者
封焱杰
戚承志
赵发
王泽帆
马啸宇
FENG Yan-jie;QI Cheng-zhi;ZHAO Fa;WANG Ze-fan;MA Xiao-yu(Beijing Future Urban Design Advanced Innovation Center,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing International Cooperation Base for Urban Transport Infrastructure Construction,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China)
出处
《工程爆破》
CSCD
北大核心
2024年第1期9-17,共9页
Engineering Blasting
基金
国家自然基金面上基金资助项目(12172036,51774018)
长江学者和创新团队发展计划基金资助项目(PCSIRT,IRT_17R06)。
关键词
岩石力学
动态破碎
裂纹扩展模型
屈曲失稳
平均破碎块度
应变率
rock mechanics
dynamic fragmentation
crack propagation model
buckling instability
average fragment size
strain rate
