花岗岩球砾法向恢复系数试验研究

doi:10.13722/j.cnki.jrme.2015.1787

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Abstract 法向恢复系数是岩崩块石运动分析的关键参数，其取值直接决定了块石的运动轨迹。为了严格测定花岗岩球砾碰撞的法向恢复系数，分析其影响因素，试验采用自行设计的碰撞试验装置和声频采样技术，精确测定花岗岩球砾碰撞的法向恢复系数，研究球砾大小、碰撞速度、含水状态和板的弹性特性4个因素对恢复系数的影响；并基于弹性接触理论推导出碰撞过程的最大接触应力、碰撞起裂速度和碰撞损伤速度vcd，构造接触应力割线变化率来描述碰撞过程的率相关，分析碰撞法向恢复系数的尺寸效应和速率效应，对碰撞过程耗能机制进行探讨。试验结果表明：花岗岩球砾法向恢复系数存在明显的尺寸效应，低速下更加显著；法向恢复系数的速率效应同样较明显，并且速率效应受球砾尺寸和板的弹性特性影响，呈现较强的相关性；球砾大小和速度相同时，等效弹性模量E?越大，法向恢复系数越小；含水状态对法向恢复系数影响不大。理论分析表明：和为控制法向恢复系数变化规律的内在因素；尺寸和速度均是通过改变和使法向恢复系数呈现复杂的尺寸效应和速率效应。

Key words：岩石力学花岗岩球砾法向恢复系数尺寸效应速率效应

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	Articles by authors
	YE Yang
	ZENG Yawu
	ZENG Chao
	JIN Lei

Cite this article:

YE Yang,ZENG Yawu,ZENG Chao, et al. Experimental study on the normal restitution coefficient of granite spheres[J]. , 2017, 36(3): 633-643.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.1787 OR http://www.rockmech.org/EN/Y2017/V36/I3/633

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