摘要
能量转化在岩石变形破坏中起着根本作用,分析岩石在动态加载过程中的能量组成有助于把握岩石变形破坏的本质特征。针对动态破坏能量分析尤其是动能分析研究较少的现状,本文采用分离式霍普金森压杆(SHPB)装置对带预制裂纹的半圆盘三点弯试样进行动态加载,并结合高速摄像机等设备,对大理岩在动态作用下的断裂能和动能进行定量研究。研究结果表明:随着加载率的增大,大理岩的断裂能和动能都随之增大;试件破碎的断裂能和加载率近似呈幂律关系,显示出较强的率依赖性,破碎块体的动能与平均加载率近似呈对数关系,增长相对较慢;随着加载率的增大,动能占试件吸收总能量的比例减少,但仍不能忽略动能的影响。
Energy transformation plays a fundamental role in rock deformation and fracture.Analyzing the energy composition of rock during dynamic loading helps us to understand the essential characteristics of rock deformation and fracture.At present,the research on dynamic fracture energy analysis,especially on kinetic energy analysis,is still lacking.In order to study the deformation and fracture of marble under dynamic loading,the split Hopkinson pressure bar(SHPB)system was used to load the pre-cracked half-disc three-point bending specimens,in combination with high-speed cameras and other equipment.The dynamic properties of marble such as fracture energy and kinetic energy e analyzed.The analysis shows that with the increase of loading rate,the fracture energy and kinetic energy of marble all increase.A power-law relationship between the fracture energy and average loading rate of specimen fracture is revealed,which shows a strong loading rate dependence.But the relationship between the kinetic energy and the average loading rate is approximately logarithmic.With the increase of loading rate,the proportion of kinetic energy in the total energy absorbed by the test piece decreases,but the influence of kinetic energy cannot be ignored.
作者
孙友杰
戚承志
朱华挺
郭云鹏
王玉琪
Sun Youjie;Qi Chengzhi;Zhu Huating;Guo Yunpeng;Wang Yuqi(Beijing Advanced Innovation Center for Future Urban Design,Beijing 100044,P.R.China;Beijing University of Civil Engineering and Architecture,School of Civil and Transportation Engineering,Beijing 100044,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2020年第1期43-49,共7页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51478027,51774018)
973重大项目子课题(2015CB57805)
大土木与地下建筑工程长江学者和创新团队发展计划(IRT_17R06).
