(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy
of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；
3. Department of Civil Engineering，Monash University，Victoria 3801，Australia)
Abstract：In order to investigate compressive behaviours of layered rocks with different dip angles under different impact loads，dynamic compression tests of phyllite rocks were carried out using the split Hopkinson pressure bar system. The failure modes of rock are analyzed in terms of fracture morphology，wave propagation and energy dissipation. The fracturing modes of layered phyllite specimens can be divided into four types. At lower impact velocity，most of the specimens are destroyed by one type of fracture surface，and at higher impact velocity，a variety of fracture types are mixed. With the increase of impact velocity，the fracture modes increase and the average fragment size of rock decreases. The dynamic compressive strength performs a U-shaped change with the increase of dip angle，which is more significant at high impact velocity. The strain rate presents the inverted shoulder shape，and the fracture strain shows a shoulder shape with the increase of the dip angle. At lower impact velocity，the fragmentation effect is more pronounced when the loading direction is 45°–67.5°. At higher impact velocity，when the loading direction is 90°，the fragmentation effect is the best.
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2019, Vol. 38 
