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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摘要落石与边坡的碰撞过程是准确模拟落石运动轨迹的关键。为了揭示碰撞中法向恢复系数复杂的尺寸效应和速度效应以及可能出现的损伤破碎现象，基于自行设计的试验装置开展大理岩球砾与板法向碰撞的室内试验。研究发现大理岩球砾存在3种损伤破碎模式：无宏观裂纹模式、有宏观裂纹模式和劈裂破坏模式，并且速度较高时，宏观裂纹的出现作为一种新的能耗机制使法向恢复系数显著降低；试验测得的法向恢复系数随速度的增加而减小，随尺寸的减小而降低，并且其速度效应同时受尺寸的影响；接触应力割线变化率与法向恢复系数具有良好的相关性，能够同时描述法向恢复系数的速度效应和尺寸效应；另外，通过黏弹性接触模型，法向恢复系数随直径减小而降低的尺寸效应得到证实。

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	叶阳
	曾亚武
	彭志雄
	孙翰卿
	任树林
	王珂

关键词 ：岩石力学, 落石冲击, 破碎模式, 能耗机制, 尺寸效应, 黏弹性接触理论

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

引用本文:

叶阳，曾亚武，彭志雄，孙翰卿，任树林，王珂. 大理岩球砾法向碰撞恢复系数及损伤破碎试验研究[J]. 岩石力学与工程学报, 2018, 37(7): 1680-1690.
YE Yang，ZENG Yawu，PENG Zhixiong，SUN Hanqing，REN Shulin，WANG Ke. Experimental study on normal coefficient of restitution and fragmenting of marble spheres#br#. , 2018, 37(7): 1680-1690.

链接本文:

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

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