珊瑚砂中应力波衰减规律的实验研究

doi:10.13722/j.cnki.jrme.2018.0147

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摘要为了揭示珊瑚砂对应力波的衰减效应，基于改进的split Hopkinson pressure bar(SHPB)装置，对干燥珊瑚砂长试件中的应力波衰减规律进行实验研究。定量测量到应力波在珊瑚砂中的平均传播速度，提出无量纲的峰值应力随传播距离的衰减公式。分析结果表明，试件端部冲击引起的应力波在75和225 mm的传播距离上可使峰值应力分别衰减至10%和1%；峰值应力速度随着传播距离的增大而减小，随无量纲峰值应力的减小而减小；与已有规范中基于陆源砂土总结的应力波传播公式对比表明，珊瑚砂对应力波衰减效果更显著。

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关键词 ：土力学, 珊瑚砂, 应力波, 衰减, split Hopkinson pressure bar(SHPB)

Abstract：To find out the attenuation of stress wave in the dried coral sand，an experiment was carried out to the long specimen by using the improved split Hopkinson pressure bar(SHPB) device. The average velocity of stress wave in the coral sand was quantitatively measured，and a formula relating the attenuation rate of the peak stress to the propagating distance was proposed. The experimental results show that the stress wave attenuates in the coral sand significantly，the peak value of stress wave attenuates to 10% and 1% as the stress wave propagate to the distance of 75 and 225 mm，respectively. It is concluded that the peak stress velocity decreases with the propagating distance，and decreases with the decreasing of dimensionless peak stress. The comparison of experimental results with the current specification and standard shows a much greater attenuation effect of stress wave in the coral sand than in the terrigenous sand.

Key words： soil mechanics coral sand stress wave attenuation split Hopkinson pressure bar(SHPB)

引用本文:

于潇1，2，陈力1，2，方秦2. 珊瑚砂中应力波衰减规律的实验研究[J]. 岩石力学与工程学报, 2018, 37(6): 1520-1529.
YU Xiao1，2，CHEN Li1，2，FANG Qin2. Experimental study on the attenuation of stress wave in coral sand. , 2018, 37(6): 1520-1529.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0147 或 http://www.rockmech.org/CN/Y2018/V37/I6/1520

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