Influence of interface morphology on dynamic behavior and energy dissipation of bi-material discs  

界面形态对双材料圆盘的动态行为和能量耗散的影响

作　　者：Zi-long ZHOU Jian-you LU Xin CAI Yi-chao RUI 周子龙;陆建友;蔡鑫;芮艺超(中南大学资源与安全工程学院,长沙410083)

机构地区：[1]School of Resources and Safety Engineering,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第7期2339-2352,共14页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.41772313);the National Natural Science Foundation for Young Scientists of China (No.52104111);the Hunan Science and Technology Planning Project,China (No.2019RS3001);the Natural Science Foundation of Hunan Province,China (No.2021JJ30819);Key Science and Technology Project of Guangxi Transportation Industry (Research on fine blasting and disaster control technology of mountain expressway tunnel),China;the financial contribution and convey their appreciation for supporting this basic research。

摘　　要：To investigate the dynamic behavior and energy dissipation of the rock−concrete interface,dynamic splitting tests on bi-material discs were conducted by using the split Hopkinson pressure bar.The test results reveal that with the change of the interface inclination angles(θ),the influence of interface groove width on the bearing capacity of specimens also varies.Whenθincreases from 0°to 30°,the bearing capacity of the specimen increases first and then decreases with the rise of the interface groove width;the optimal groove width on the rock surface in this range of interface inclination angles is 5 mm.Whenθincreases from 45°to 90°,the bearing capacity of the specimen has no obvious change.Moreover,whenθincreases from 0°to 45°,the dissipated energy of the specimens rises obviously at first and then tends to be stable as the width of the interface groove increases.为了研究岩石-混凝土界面的动态行为和能量耗散,采用霍普金森压杆对双材料圆盘进行动态劈裂试验。结果表明,随着界面倾角(θ)的变化,界面槽宽度对试件承载力的影响也发生变化。当θ从0°增加到30°时,试样的承载力随界面槽宽度的增加先增大后减小;在此界面倾角范围内,岩石表面的最佳刻槽宽度为5 mm。当θ从45°增加到90°时,试样的承载力没有明显变化。当θ从0°增大到45°时,随着界面槽宽度的增大,试样的耗散能先明显增加,然后趋于稳定。

关 键 词：rock−concrete interface Brazilian disc splitting fracture development interface mechanical properties dynamic behavior energy dissipation 

分 类 号：TU45[建筑科学—岩土工程] TU528[建筑科学—土工工程]