混凝土/花岗岩界面Ⅰ-Ⅱ复合型动态断裂试验研究  

An experimental study on mixed mode Ⅰ-Ⅱ dynamic fracture of concrete/granite interface

作　　者：马振洲 钟红 陈育志[3] 王小乐 MA Zhenzhou;ZHONG Hong;CHEN Yuzhi;WANG Xiaole(Bohai Hebei Investment Group Co.,Ltd.,Cangzhou 061113,China;State Key Lab of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100048,China;Architectural Engineering Institute,Jinling Institute of Technology,Nanjing 211169,China)

机构地区：[1]河北渤海投资集团有限公司,河北沧州061113 [2]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100048 [3]金陵科技学院建筑工程学院,南京211169

出　　处：《振动与冲击》2021年第4期277-282,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(51979292,51579033);国家重点研发计划(2017YFC0404903);中国水利水电科学研究院基本科研业务费专项(EB0145B112019)。

摘　　要：为研究混凝土/岩石界面在复合型应力条件下的动态断裂性能,考虑四种应变率(10-5~10-2 s-1)及三种模态(21.8°,41.7°和60.3°)工况,对混凝土/花岗岩复合试件进行了四点剪切试验,获得了荷载与裂缝张开位移及裂缝剪切位移的关系曲线;结合界面力学理论和结构动力分析得到了界面Ⅰ型和Ⅱ型动态应力强度因子,据此得到并分析了断裂韧度、应变能释放率的率相关性及模态比相关性。结果表明:在所研究的应变率和模态角范围内,同一时刻的裂缝张开位移均大于裂缝剪切位移;Ⅰ型和Ⅱ型断裂韧度均随应变率的提高而增加,Ⅰ型断裂韧度随模态角的增大而减小,Ⅱ型断裂韧度随模态角的增大而增加;应变能释放率随应变率和模态角的增加均呈现出增长趋势。In order to study the dynamic fracture behavior of concrete/rock interface under composite stress,four kinds of strain rates(10-5-10-2 s-1)and three modes(21.8°,41.7°and 60.3°)were considered.Four-point shear tests were carried out on concrete/granite composite specimens.The relationship curves between load and crack opening displacement and crack shear displacement were obtained.Based on the theory of interface mechanics and structural dynamic analysis,the dynamic stress intensity factors of mode I and mode II were obtained,and the strain rate dependence and modal ratio dependence of fracture toughness and strain energy release rate were obtained and analyzed.The results show that in the range of strain rate and mode angle under study,the crack opening displacement at the same time is larger than the crack shear displacement.The fracture toughness of mode I and mode II increases with the strain rate,while the fracture toughness of mode I decreases with mode angle,and the fracture toughness of mode II increases with mode angle.The strain energy release rate increases with strain rate and modal angle.

关 键 词：混凝土/岩石界面 应变率 四点剪切试验 断裂韧度 应变能释放率 模态角 

分 类 号：TV431[水利工程—水工结构工程] TV313