A study on impact dynamic characteristics of soft and hard medium combined rock mass

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (12) : 135-144.

WANG Yanbing1,2，REN Bin1，GENG Yanjie1，LI Zhengkuan1

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Abstract

In order to explore the impact dynamic characteristics of soft and hard media composite rock mass, which is common in rock breaking and supporting engineering, granite and sandstone with large difference in protodeacon coefficient are used to splice into soft and hard media and single media composite rock mass. The split Hopkinson pressure bar (SHPB) test system is used to carry out the impact compression test of composite rock mass, respectively. The fluctuation characteristics, peak strength of stress wave into soft and hard media and single media composite rock mass are compared and analyzed, and the crack propagation morphology of composite rock mass is recorded by high-speed camera. Through the numerical simulation of discrete lattice spring method (DLSM), a comprehensive inversion analysis is carried out to study the variation law of stress time history curve of rock on both sides of cemented surface of soft and hard medium composite rock mass, and the ' soft and hard combination coefficient ' is used to characterize the damage evolution law of soft and hard medium composite rock mass. The results show that the wave characteristics of composite rock mass have obvious wave impedance effect. The better the wave impedance matching effect between composite rock mass and incident rod, the smaller the amplitude of reflected wave and the larger the amplitude of transmitted wave. At the same impact velocity, the peak strength of soft-hard rock mass is close to that of single medium soft rock mass. The failure degree and failure mode of soft-hard medium composite rock mass are obviously different from that of single medium composite rock mass. The crack of soft-hard medium composite rock mass first occurs at the end of sandstone far from the cementation surface, while the crack of single medium composite rock mass first occurs at the cementation surface. The single medium composite rock mass is mainly shear failure, supplemented by local tensile failure, and the failure is more complete. The soft sandstone in the soft-hard rock mass has shear failure, while the hard granite has no obvious damage. The rock stress on both sides of the cementation surface of the soft-hard medium combination rock mass presents a repeated phenomenon of rise-decrease-rise-decrease with time. The stress of the rock on both sides of the cemented surface of the single medium composite rock mass begins to decrease after reaching the peak stress, and there is no stress recurrence. The damage degree D of rock mass composed of soft and hard media is quadratically related to the coefficient γ of soft and hard media: D=-0.85γ2+2.80γ.

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Composite rock mass / SHPB / DLSM / Crack propagation

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WANG Yanbing1,2，REN Bin1，GENG Yanjie1，LI Zhengkuan1. A study on impact dynamic characteristics of soft and hard medium combined rock mass[J]. Journal of Vibration and Shock, 2023, 42(12): 135-144

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