节理频度对类岩石介质裂纹扩展行为的影响  

Effect of Frequency of Joints on Crack Propagation Behavior of Rock-like Media

作　　者：杨立云[1] 张飞 董劭扬 黄晨 汪自扬 张东宾 YANG Li-yun;ZHANG Fei;DONG Shao-yang;HUANG Chen;WANG Zi-yang;ZHANG Dong-bin(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《科学技术与工程》2021年第1期20-26,共7页Science Technology and Engineering

基　　金：国家自然科学基金(51974316);中央高校基本科研业务费(800015X2);中国矿业大学(北京)大学生创新训练项目(C202006872);中国矿业大学(北京)越琦学者项目(800015Z1125)。

摘　　要：为研究节理频度对类岩石介质受冲击荷载作用时动态裂纹扩展行为的影响,借助新型数字激光动态焦散线实验系统进行了试验研究。结果表明:随着节理频度的增大,竖向裂纹起裂时的动态应力强度因子减小,但大于水平节理翼侧裂纹起裂时的应力强度因子;裂纹扩展至节理区域时,动态应力强度因子有一个交替震荡的过程,此过程持续时间随节理频度增大而延长;竖向裂纹从加载到起裂时间并不明显改变,但从起裂到试件贯通破坏的时间近似线性增长;竖向裂纹起裂后的速度随节理频度增大有所减小,但大于裂纹扩展通过节理区域后的速度。可见不同节理频度类岩石介质的裂纹扩展行为存在差异,为冲击荷载下岩石断裂破坏提供理论参考。To study the effect of frequency of joints on the dynamic crack propagation behavior of rock-like media under impact loading,a new digital laser dynamic caustics experiment system was used for experimental research.Results show that as the frequency of joints increased,the dynamic stress intensity factor decreased during vertical crack initiation,while the factor was greater than that during horizontal crack initiation of wing-side cracks.When cracks propagated into the joint area,the intensity factor showed an alternating oscillation process.The duration of this process increased with the frequency of joints.The crack initiation time did not change significantly,but the time from crack initiation to specimen penetration failure increased approximately linearly.The speed after vertical crack initiation decreased with the increasing of the frequency of joints,but was still greater than that of crack propagation through the joint area.Therefore,there are differences in crack propagation behavior of rock-like media with different frequencies of joints,which provides a theoretical reference for rock fracture failure under impact loading.

关 键 词：冲击荷载 节理频度 裂纹扩展 动态应力强度因子 

分 类 号：O346.1[理学—固体力学]