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| Nonlinear mechanical problems in rock explosion and shock. Part I：#br#
Experimental research on properties of one-dimensional wave propagation#br#
in block rock masses |
| LI Jie1，2，WANG Mingyang1，2，JIANG Haiming1，DENG Shuxin2 |
| (1. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact，Army Engineering University of PLA，Nanjing，Jiangsu 210007，China；2. School of Mechanical Engineering，Nanjing University of Science and Technology，Nanjing，Jiangsu 210094，China) |
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Abstract Problems of pendulum-type waves associated with the tectonic hierarchy of rock masses are becoming an important research aspect of nonlinear rock mechanics，and presenting potential applications in studies of earthquakes，rockbursts and other seismic events. Thus，a new dynamic test testing system was designed，and a series of experiments were performed by the method of physical modeling，to reveal the characteristics of pendulum-type waves propagating in block rock masses. The frequency，amplitude and wave velocity were measured，then typical properties of pendulum-type waves in block rock masses which are quite different from waves in continuous media are obtained. Experimental results show that：In the process of vibration propagating from one block to another，the waves tends to transfer from high-frequency to low-frequency；Under the action of external pulse，the displacements of the adjacent rock blocks are quite different or even in different motion directions，result in oscillations of rock blocks one another and contacts broken；The vibration and acceleration amplitudes of each block attenuates with distance exponentially；The propagation velocity of pendulum-type wave is far less than P-wave，and it mainly depends on the widths of fissures between the blocks and the vibrational velocity of the blocks.
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2018, Vol. 37 
