NUMERICAL ANALYSIS FOR THE EFFECT OF STRESS WAVE PROPAGATION THROUGH NONLINEAR JOINTS
LIU Tingting，LI Jianchun，LI Haibo Zheng Yun
(State Key Laboratory of Geotechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，
Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：Firstly，in order to validate the DEM software UDEC in simulating the wave propagation across a rock mass with two sets of nonlinear joints，two examples were computed with a nonlinear joint model embedded in UDEC. The results agreed well with the existing theories. Secondly，the influence of the angle and space of joints on the propagation of stress wave across two sets of intersecting joints was studied. It was found that the attenuation of stress wave across two sets of intersecting joints was greater than that across the parallel joints under the same angle and joint space. Transmission coefficient reduced with increasing the angle. The space of the intersecting and parallel joints had the similar influence on the transmission coefficient. Finally，a parametric study was conducted to investigate the effects of the angle ? between the joints and the stress wave，the angle ? between the two sets of joints，the space for each set of joints and the width of joint area L. The analytical results showed that the influences of ? and ? were different with the ranges changing. The similarities existed between the influence of space of intersecting joints and parallel joints. With the increasing of L，the attenuation decreased significantly firstly and then slowed down. Hyperbolic function was employed to fit the result and the fitting result had good agreement.
杨风威，李海波，李建春，等. 斜入射线弹性节理应力波传播特征的数值模拟[J]. 岩土力学，2013(3)：901-907.(YANG Fengwei，LI Haibo，LI Jianchun，et al. Numerical simulation of regulation for stress waves obliquely impinging upon a linear elastic joint[J]. Rock and Soil Mechanics，2013(3)：901-907.(in Chinese))
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2015, Vol. 34 
