Tests for effects of wave impedance on rock’s dynamic performance
YANG Renshu1,2, LI Weiyu1, FANG Shizheng1, ZHU Ye1, LI Yongliang1,2, ZHENG Changda1
1.School of Mechanics and Architecture Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China；
2.State Key Laboratory for Geomechanics and Deep Underground Engineering, Beijing 100083, China
Abstract：A series of impact compression tests were conducted on model materials with different wave impedances under different strain rates using the split-Hopkinson pressure bar (SHPB) test system.The test results showed that under impact load, rock’s stress wave propagation characteristics, dynamic stress-strain relation and fractal features of rock fragmentation are affected by wave impedance, strain rate and impact velocity; when wave impedance is the same, amplitudes of reflected wave and transmitted one increase linearly with increase in impact velocity; at the same time, effect of strain rate is obvious, with increase in strain rate, peak stress increases linearly, dynamic elastic modulus increases, and strain softening stage prolongs; when crushing degree increases, fractal dimension of fragmentations increases linearly; when strain rate is the same, with decease in wave impedance, amplitude of reflected wave increases and transmitted one’s decreases; when peak stress decreases, strain softening stage prolongs, plastic stage tends to be obvious, and plastic flow phenomenon appears; when crushing degree increases, fractal dimension of fragmentations increases; with decrease in wave impedance, effect of increase in strain rate on increase in dynamic anti-compression intensity and enhancing degree of crushing weakens, strain rate’s effect weakens and gradually tends to be unconspicuous.
杨仁树1,2，李炜煜1，方士正1，朱晔1，李永亮1,2，郑昌达1. 波阻抗对岩石动力学特性影响的模拟试验研究[J]. 振动与冲击, 2020, 39(3): 178-185.
YANG Renshu1,2, LI Weiyu1, FANG Shizheng1, ZHU Ye1, LI Yongliang1,2, ZHENG Changda1. Tests for effects of wave impedance on rock’s dynamic performance. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(3): 178-185.
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