【摘要】 采用间接边界元法,借助Wolf的土层和半空间精确动力刚度矩阵和斜线荷载格林函数,在频域内求解了局部断层场地对P波的散射,着重分析了破碎带较窄断层两侧围岩动力响应的基本规律,以及场地动力特性对散射的影响。研究表明,破碎带断层对入射P波有着显著的影响,即使破碎带很窄,也可对P波产生很大的放大作用;层状场地动力特性对放大作用有显著的影响。更多还原

【Abstract】 Diffraction of plane P waves around a local fault is presented in frequency domain using IBEM,in which,the dynamic stiffness matrix and Green’s function for distributed loads acting on inclined line by Wolf are used. The paper discusses emphatically the dynamic response to the surrounding rock of the narrow fracture zone and the effect of the dynamic characteristics of layered site on the diffraction. It is shown that a local fault has great effect on wave diffraction. Even if the local fault is very narrow,significant amplification may appear. The dynamic characteristics of layered site also play an important role in the wave amplification.更多还原