探讨振动激励下湿颗粒物质中的断层行为

Faultage behavior of wet granular materials under vibrational excitation

研究了竖直振动激励下湿颗粒物质中的一种断层行为,实验表明断层块的运动具有周期性,其周期是激振周期的整数倍,倍率强烈地依赖于约化加速度Г,随着Г的加大,倍率阶梯式增加。采用蹦球模型对其进行了动力学分析,其数值解结果对于倍率为三倍和四倍的周期运动对应的Г值与实验结果吻合较好,对于倍率为两倍的周期运动对应的Г值比实验值小,最后定性地解释了偏小的原因。

The faultage behavior of wet granular materials under vertical vibration excitation was studied.An experiment shows the motion of the faultage block is of periodicity,with the period of an integral multiple of the driving period.The ratio n （the period of faultage block divided by the driving period ） is dependent on the normalized acceleration Гintensively,and it increases stepwisely with the increase ofГ.A dynamic analysis was given based on the bouncing ball model.Comparing the numerical results and the experimental data,it concludes that the valueГin the case of n=2 or n =3 coincides well with the experimental value,but the value Гin the case of n =2 is smaller than the experimental value,and the reason was explained qualitatively.