Determining the Viscosity Coefficient for Viscoelastic Wave Propagation in Rock Bars
Determining the Viscosity Coefficient for Viscoelastic Wave Propagation in Rock Bars
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DOI：
10.1007/s00603-018-1407-3
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发表时间：
2018-01
影响因子：
6.2
通讯作者：
L. Niu;Wancheng Zhu;Shao-hua Li;K. Guan
中科院分区：
文献类型：
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作者：
L. Niu;Wancheng Zhu;Shao-hua Li;K. Guan
具有微缺陷的岩石在应力波传播过程中表现出粘弹性行为。波的粘性系数可以用来表征波在岩石中传播时的衰减情况。在这项研究中，制造了一个具有易于调节粘度系数的长人造棒来研究应力波衰减。研究了动态加载下人造杆的粘弹性行为，并根据入射谐波的振幅衰减获得了初始粘弹性系数。编写了一维波传播程序来再现实验期间测量的应力波的时间历史，并且该程序很好地拟合了开尔文-沃伊特模型。对长人造粘弹性棒中应力波的衰减和分散进行量化，以准确确定粘弹性系数。最后，将基于实验和数值模拟的长人工沙坝粘弹性系数的确定方法推广到短岩石沙坝粘弹性系数的确定。本研究提供了一种测定岩石粘度系数的新方法。
Rocks with microdefects exhibit viscoelastic behavior during stress wave propagation. The viscosity coefficient of the wave can be used to characterize the attenuation as the wave propagates in rock. In this study, a long artificial bar with a readily adjustable viscosity coefficient was fabricated to investigate stress wave attenuation. The viscoelastic behavior of the artificial bar under dynamic loading was investigated, and the initial viscoelastic coefficient was obtained based on the amplitude attenuation of the incident harmonic wave. A one-dimensional wave propagation program was compiled to reproduce the time history of the stress wave measured during the experiments, and the program was well fitted to the Kelvin–Voigt model. The attenuation and dispersion of the stress wave in long artificial viscoelastic bars were quantified to accurately determine the viscoelastic coefficient. Finally, the method used to determine the viscoelastic coefficient of a long artificial bar based on the experiments and numerical simulations was extended to determine the viscoelastic coefficient of a short rock bar. This study provides a new method of determining the viscosity coefficient of rock.