混凝土/花岗岩界面Ⅰ-Ⅱ复合型动态断裂试验研究

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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/s -10-2/s）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。

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	马振洲1
	钟红2
	陈育志3
	王小乐1

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

Abstract：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.

Key words： concrete/rock interface strain rate four-point shear test fracture toughness strain energy release rate modal angle

收稿日期: 2019-10-29 出版日期: 2021-02-28

引用本文:

马振洲1，钟红2，陈育志3，王小乐1. 混凝土/花岗岩界面Ⅰ-Ⅱ复合型动态断裂试验研究[J]. 振动与冲击, 2021, 40(4): 277-282.
MA Zhenzhou1, ZHONG Hong2, CHEN Yuzhi3， WANG Xiaole1. An experimental study on mixed mode I-II dynamic fracture of concrete/granite interface. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(4): 277-282.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I4/277

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