局部断层场地对P波的散射影响研究
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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。
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.
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.
引文
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[13]李仕栋,罗奇峰.非活动隐伏断层对结构地震反应的影响[J].自然灾害学报,2003,12(4):25-28.LI Shi-dong,LUO Qi-feng.Influence of non-active concealed fault to seismic response of structure[J].Journal of Natural Disasters,2003,12(4):25-28.
[14]李仕栋,罗奇峰.不同倾角断层对场地动力放大效应的分析[J].地震研究,2004,27(3):283-286.LI Shi-dong,LUO Qi-feng.Analysis of magnification effect of faults with various rake angles to site dynamic response[J].Journal of Seismological Research,2004,27(3):283-286.
[15]任春,罗奇峰.断层破碎带对非发震断层场地地震动的影响[J].地震研究,2005,28(2):162-166.REN Chun,LUO Qi-feng.Effect of fault fracture zone on the ground motion of non-causative fault site[J].Journal of Seismological Research,2005,28(2):162-166.
[16]梁建文,冯领香,巴振宁.含断层破碎带场地对平面SH波的放大作用[J].地震学报,2010,32(3):300-309.LIANG Jian-wen,FENG Ling-xiang,BA Zhen-ning.Amplification of plane SH waves by a local fault with fracture zone[J].Acta Seismologica Sinica,2010,32(3):300-309.
[17]梁建文,巴振宁.弹性层状半空间中沉积谷地对入射平面SH波的放大作用[J].地震工程与工程振动,2007,27(3):1-9.LIANG Jian-wen,BA Zhen-ning.Surface motion of an alluvial valley in layered half-space for incident plane SH waves[J].Earthquake Engineering and Engineering Vibration,2007,27(3):1-9.
[18]WOLF J P.Dynamic soil-structure interaction[M].Englewood Cliffs:Prentice-Hall,1985.
[2]石崇,徐卫亚,周家文,等.节理面透射模型及其隔振性能研究[J].岩土力学,2009,30(3):729-740.SHI Chong,XU Wei-ya,ZHOU Jia-wen,et al.Transmission model of joint interface and its performanceof vibration isolation[J].Rock and Soil Mechanics,2009,30(3):729-740.
[3]胡聿贤,孙平善,章在墉,等.场地条件对震害和地震动的影响[J].地震工程与工程振动,1980,试刊(1):34-41.HU Yu-xian,SUN Ping-shan,ZhANG Zai-yong,et al.Effects of site conditions on earthquake damage and ground motion[J].Earthquake Engineering and Engineering Vibration,1980,00(1):34-41.
[4]周正华,张艳梅,孙平善,等.断层对震害影响的研究[J].自然灾害学报,2003,12(4):20-24.ZHOU Zheng-hua,ZHANG Yan-mei,SUN Ping-shan,et al.Study on effect of fault on seismic damage[J].Journal of Natural Disasters,2003,12(4):20-24.
[5]石玉成,陈炳午.非发震断层的地震效应问题[J].西北地震学报,1994,16(1):12-16.SHI Yu-cheng,CHEN Bing-wu.Effects of non-causative faults on earthquake damages[J].Northwestern Seismological Journal,1994,16(1):12-16.
[6]梁建文.穿越三种土介质管线的动力分析[J].天津大学学报,1998,31(2):163-168.LIANG Jian-wen.Dynamic analysis of pipelines laid through three soil media[J].Journal of Tianjin University,1998,31(2):163-168.
[7]温瑞智,周正华,杨柏坡,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].Earthquake Engineering and Engineering Vibration,2002,22(1):21-27.
[8]李山有,马强,武东坡,等.断层场地地震反应特征研究[J].地震工程与工程振动,2003,23(5):32-37.LI Shan-you,MA Qiang,WU Dong-po,et al.Study on characteristics of seismic responses of fault sites[J].Earthquake Engineering and Engineering Vibration,2003,23(5):32-37.
[9]杨笑梅,王海涛,杨柏坡.竖向地裂缝附近的地面运动[J].地震工程与工程振动,2005,25(5):34-40.YANG Xiao-mei,WANG Hai-tao,YANG Bai-po.The ground motion near vertical cracks in fault sites[J].Earthquake Engineering and Engineering Vibration,2005,25(5):34-40.
[10]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].Earthquake Engineering and Engineering Vibration,2006,26(5):7-13.
[11]杨笑梅,王海涛,杨柏坡.三维竖向断层场地对地面运动的影响[J].地震工程与工程振动,2008,28(2):1-7.YANG Xiao-mei,WANG Hai-tao,YANG Bai-po.The influence of three-dimensional fault sites on the ground motion[J].Earthquake Engineering and Engineering Vibration,2008,28(2):1-7.
[12]曹炳政,罗奇峰.浅层断层对场地地震动影响的有限元分析[J].地震学报,2003,25(1):96-101.CAO Bing-zheng,LUO Qi-feng.Analysis on effect of surface fault on site ground motion using finite element method[J].Acta Seismologica Sinica,25(1):96-101.
[13]李仕栋,罗奇峰.非活动隐伏断层对结构地震反应的影响[J].自然灾害学报,2003,12(4):25-28.LI Shi-dong,LUO Qi-feng.Influence of non-active concealed fault to seismic response of structure[J].Journal of Natural Disasters,2003,12(4):25-28.
[14]李仕栋,罗奇峰.不同倾角断层对场地动力放大效应的分析[J].地震研究,2004,27(3):283-286.LI Shi-dong,LUO Qi-feng.Analysis of magnification effect of faults with various rake angles to site dynamic response[J].Journal of Seismological Research,2004,27(3):283-286.
[15]任春,罗奇峰.断层破碎带对非发震断层场地地震动的影响[J].地震研究,2005,28(2):162-166.REN Chun,LUO Qi-feng.Effect of fault fracture zone on the ground motion of non-causative fault site[J].Journal of Seismological Research,2005,28(2):162-166.
[16]梁建文,冯领香,巴振宁.含断层破碎带场地对平面SH波的放大作用[J].地震学报,2010,32(3):300-309.LIANG Jian-wen,FENG Ling-xiang,BA Zhen-ning.Amplification of plane SH waves by a local fault with fracture zone[J].Acta Seismologica Sinica,2010,32(3):300-309.
[17]梁建文,巴振宁.弹性层状半空间中沉积谷地对入射平面SH波的放大作用[J].地震工程与工程振动,2007,27(3):1-9.LIANG Jian-wen,BA Zhen-ning.Surface motion of an alluvial valley in layered half-space for incident plane SH waves[J].Earthquake Engineering and Engineering Vibration,2007,27(3):1-9.
[18]WOLF J P.Dynamic soil-structure interaction[M].Englewood Cliffs:Prentice-Hall,1985.
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