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| An experimental study on mixed mode I-II dynamic fracture of concrete/granite interface |
| MA Zhenzhou1, ZHONG Hong2, CHEN Yuzhi3， WANG Xiaole1 |
1.Bohai Hebei Investment Group Co., Ltd., Cangzhou 061113, China;
2.State Key Lab of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100048, China;
3.Architectural Engineering Institute, Jinling Institute of Technology, Nanjing 211169, China |
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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.
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Received: 29 October 2019
Published: 28 February 2021
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