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Numerical simulation of stress wave propagating through filled joints by particle model

Numerical simulation of stress wave propagating through fill...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Xiaoling Huang Shengwen Qi Ann Williams Yu Zou Bowen Zheng Key Laboratory of Shale Gas and Geoengineering(KLSGG) Institute of Geology and GeophysicsChinese Academy of Sciences University of Chinese Academy of Sciences

This paper presents a numerical simulation of stress wave propagation through filled joints using the particle flow code(PFC2D 3.10).A thin layer of granular material without tensile strength is used to model the natural filled *** Kelvin viscous-elastic contact model is developed with C++code and embedded as the dynamic link library in PFC2D 3.10 to simulate the particle deformation behavior of the filled *** has been proved that the PFC2D is competent in simulating the stress wave propagating through a filled joint according to the comparison between the forward fitting data and the experiment *** influence of amplitude and frequency on the transmission coefficient is analyzed,and the results show that the transmission coefficient is amplitude and frequency ***,the effect of the tensile stress wave,loading history and filled thickness on the transmission waves is also *** has been found that the transmission coefficient decreases with the increase of the filled *** tensile stress wave cannot propagate through the filled joint but can tear apart the filled layer,which weakens the multiple reflections in the filled *** the incident wave is composed of multiple pulses,the loading history has an important effect on the transmitted *** multiple parallel filled joints,the variation trend of the transmission coefficient versus the dimensionless joint spacing is similar to the analytical result obtained by Zhu et al.(2011)except that the loading mode and amplitudes have an important effect on the magnitude of the transmission ***,the deformation process of the filled layer under different loading modes was examined microscopically.

关键词： Filled joint Stress wave PFC2D amplitude-and frequency-dependence Loading history Multiple reflections

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