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论文类型：期刊论文

发表时间：2022-06-30

发表刊物：Journal of Shenyang Jianzhu University. Natural Science

卷号：36

期号：4

页面范围：653-660

ISSN号：2095-1922

关键字："stress wave; homogeneous rock bar; numerical simulation; spall failure; wavelength"

CN号：21-1578/TU

摘要：In order to better research the dynamic stability of surrounding rock structure,the propagation characteristics of stress waves and the rules of spall failure in rock bar were detected.Numerical models I and II of uniform rock bars were established by RFPA~(2D-Dynamic) numerical simulation software,and right triangle impact loads were applied respectively on them.The propagation patterns of stress waves in the bar and at the fixed end of model I were compared with the result of theoretical analysis.Five impact loads with same peak values and different durations were applied to model II,and the process of spallation induced by stress waves reflected at the free end in the straight bar was numerically simulated.The simulation results showed that the compressive stress wave was reflected as a compressive wave at the fixed end,and a lot of shear waves and tensile waves were continuously generated on the free surfaces of the two boundaries of the bar;the peak value of compression wave gradually decreased with the propagation of stress wave.As the impact wave was continuously generated,the crack propagation range continuously expanded,the number of initiated cracks and the crack spacing increased.The conclusion showed that the numerical simulation of shock wave propagation morphology is in good agreement with the theoretical analysis results;Different impact unloading rates have varied influence on the dynamic crack initiation position and spallation extension length of rock bar.

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