不同深度与倾角断层破碎带对Rayleigh波传播及场地地震动反应的影响研究  

Effect of fault fracture zone with various depths and rake angles on spreading of Rayleigh wave and ground motion

作　　者：刘晶波[1] 王文晖[1] 赵冬冬[1] 刘祥庆[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《振动与冲击》2013年第4期111-115,126,共6页Journal of Vibration and Shock

基　　金：国家973项目(2011CB013602);北京市自然科学基金重点项目(8111001);国家自然科学基金重大研究计划项目(90715035)

摘　　要：采用Rayleigh波时域波动输入方法,对Rayleigh波作用下的场地地震动反应进行动力时程反应分析,重点研究了断层破碎带深度与倾角对Rayleigh波传播以及场地地震动反应的影响。结果表明:断层破碎带对Rayleigh波传播及场地地震动反应影响显著。在Rayleigh波入射一侧的断层角点以及距角点较近处,峰值位移反应随着断层深度的增大而增大并趋于稳定,而随着断层倾角的增大其峰值位移反应明显减小;在Rayleigh波入射一侧的中远场地表面,断层深度与倾角对地面峰值位移反应影响很小;在另一侧中远场地面的峰值位移反应随着断层深度的增大而减小,而断层倾角的变化对该侧地面的峰值位移反应影响很小。最后通过改变场地条件进行了适用性分析,结果表明该结论具有较好的适用性。Dynamic analysis of ground motion with faults of various depths and rake angles under Rayleigh wave was performed using Rayleigh wave input method based on a viscous-spring artificial boundary. The effect of faults with various depths and rake angles on spreading of Rayleigh wave and ground motion was studied. The results showed variations of depth and rake angle have little effect on the mediate and far field on the incident side of Payleigh wave ： peak displacement response of the fault comer and the ground nearby on the incident side of Payleigh wave rises greatly with increase in fault depth, but gradually tends to a constant; these positions have larger displacement responses when rake angle becomes sharp ; in the mediate and far field on the other incident side of Rayleigh wave, peak horizontal and vertical absolute displacements decrease gradually with increase in fault depth, under conditions of other fixed parameters, variations of rake angle have little effect on the peak displacement response on this side. Finally the applicability analysis of the conclusions above was made by changing ground conditions and a good applicability was verified.

关 键 词：断层破碎带 RAYLEIGH波 数值模拟 地震动 动力时程分析 位移幅值谱比 

分 类 号：O347[理学—固体力学] P315[理学—力学]