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
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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 corner 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.
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 corner 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.
引文
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[2]杨笑梅,王海涛,杨柏坡.竖向断层对场地地面运动的影响[J].地震工程与工程振动,2006,26(5):7-13.YANG Xiao-mei,WANG Hai-tao,YANG Bai-po.The influence of vertical cracks in fault sites on the ground motion[J].Journal of Earthquake Engineering and Engineering Vibration,2006,26(5):7-13.
[3]温瑞智,周正华,孙平善,等.断层场地地震动分析[J].地震工程与工程振动,2002,22(1):21-27.WEN Rui-zhi,ZHOU Zheng-hua,SUN Ping-shan,et al.Ground motion analysis for near-fault site[J].Journal of Earthquake Engineering and Engineering Vibration,2002,22(1):21-27.
[4]Makris N.Soil-pile interaction during the passage of Rayleigh waves:an analytical solution[J].Earthquake Engineering and Structural Dynamics,1994,23(2):153-167.
[5]刘晶波,李彬.Rayleigh波作用下地下结构的动力反应分析[J].工程力学,2006,23(10):132-135.LIU Jing-bo,LI Bin.Dynamic Response analysis of underground structures during propagation of rayleigh waves[J].Engineering Mechanics,2006,23(10):132-135.
[6]周正华,温瑞智,毛国滨,等.Rayleigh波入射情形下的断层效应[J].地震工程与工程振动,2006,26(5):1-6.ZHOU Zheng-hua,WEN Rui-zhi,MAO Guo-bin,et al.Effect of fault on ground motion in the case of incident Rayleigh wave[J].Journal of Earthquake Engineering and Engineering Vibration,2006,26(5):1-6.
[7]刘晶波,刘祥庆,赵冬冬.垂直断层破碎带对Rayleigh波传播与场地地震动反应的影响研究[J].爆炸与冲击,2008,28(6):507-514.LIU Jing-bo,LIU Xiang-qing,Zhao Dongdong.Effects of vertical fault fracture zones on the spreading of Rayleigh wave and ground motion[J].Explosion and Shock Waves,2008,28(6):507-514.
[8]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55-64.LIU Jing-bo,LYan-dong.A direct method for analysis of dynamic soil-structure interaction[J].China Civil Engineering Journal,1998,31(3):55-64.
[9]刘晶波,李彬.三维黏弹性静-动力统一人工边界[J].中国科学(E辑),2005,35(9):966-980.LIU Jing-bo,LI Bin.The3D unified viscous-spring artificial boundary[J].Science in China Ser.E,2005,35(9):966-980.
[10]廖振鹏.工程波动理论导论[M].北京:科学出版社,2002.
[11]李彬,刘晶波.粘弹性人工边界在Marc中的实现[C]//第十四届全国结构工程学术会议论文集第I册.烟台:工程力学杂志社,2005.
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