大理岩球砾法向碰撞恢复系数及损伤破碎试验研究

doi:10.13722/j.cnki.jrme.2018.0073

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Abstract Collision between rock blocks and the slope is the key to accuratly predicting the falling trajectory of rock. To investigate the effect of velocity and size on the normal coefficient of restitution(NCOR) and to reveal the possible damage and fragmentation phenomenon，a device implementing the normal collision of marble spheres is developed. The results show that three types of damage pattern of marble sphere exist(no macro crack type，macro crack type and fragmentation type). Moreover，a new mechanism of energy dissipation(the propagation of macro cracks) causing a significant decrease of NCOR is found. The measured NCOR of marble spheres decreases with the increasing velocity and decreasing diameter，and the effect of velocity on NCOR is also related to the size of marble sphere. The proposed averaged rate of contact stress has a good correlation with the NCOR and is able to fully describe the velocity effect and size effect of NCOR. Finally，the viscoelastic contact theory is used to describe the NCOR and it proves that the decreasing of NCOR with the decreasing of diameter is reasonable.

Key words： rock mechanics impact of rock falling failure pattern energy dissipation mechanism size effect viscoelastic contact theory

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	Articles by authors
	YE Yang
	ZENG Yawu
	PENG Zhixiong
	SUN Hanqing
	REN Shulin
	WANG Ke

Cite this article:

YE Yang,ZENG Yawu,PENG Zhixiong, et al. Experimental study on normal coefficient of restitution and fragmenting of marble spheres#br#[J]. , 2018, 37(7): 1680-1690.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0073 OR http://www.rockmech.org/EN/Y2018/V37/I7/1680

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