垂直低速带中瑞雷面波传播特性研究
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摘要
为了研究瑞雷面波在通过横向不均匀介质时的传播特性,这里通过利用交错网格高阶有限差分法,对不同宽度及不同埋深的垂直低速带模型进行了瑞雷面波波场正演模拟。模拟结果表明:瑞雷面波遇到横向不均匀介质时会产生反射和透射,从波场记录可确定低速带的位置和宽度;低速带的埋深直接影响是否能产生高阶模式的面波,当出露地表的低速带宽度增加时,高阶模式面波能量逐渐增强。
In order to study propagation characteristics of the Rayleigh wave in transverse non-homogeneous media,the vertical low-velocity zone models with different width and depth were simulated by Rayleigh wave filed forward modeling according to the staggered grid high-order finite difference method.The numerical results show that surface wave can produce reflection and transmission when it meet transverse non-homogeneous media,and then the location and the width of the low-velocity zone can be determined from the wave field recording;the depth of vertical low-velocity zone will directly affect whether to produce high order surface wave,with the increase of the width of the exposed surface of the vertical low-velocity zone,The energy of high order surface wave is gradually strengthened.
In order to study propagation characteristics of the Rayleigh wave in transverse non-homogeneous media,the vertical low-velocity zone models with different width and depth were simulated by Rayleigh wave filed forward modeling according to the staggered grid high-order finite difference method.The numerical results show that surface wave can produce reflection and transmission when it meet transverse non-homogeneous media,and then the location and the width of the low-velocity zone can be determined from the wave field recording;the depth of vertical low-velocity zone will directly affect whether to produce high order surface wave,with the increase of the width of the exposed surface of the vertical low-velocity zone,The energy of high order surface wave is gradually strengthened.
引文
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[4]房立华,吴建平,吕作勇.华北地区基于噪声的瑞雷面波群速度层析成像[J].地球物理学报,2009,52(3):663.
[5]DARINSKII A N,WEIHNACHT M,SCHMIDTH.Rayleigh wave reflection from single surface im-perfections on isotropic substrates[J].JOURNALOF APPLIED PHYSICS,2009(106):034914-1～034914-8.
[6]赵建三,李亭.瑞雷波法应用于高速公路路基工程质量无损检测试验研究[J].湖南大学学报,2003,30(1):107.
[7]林韶峰,张宏建.瞬态瑞雷波法在堤防防渗墙质量检测中的应用研究[J].岩土力学,2005,26(5):809.
[8]张大洲,熊章强,顾汉明.高精度瑞雷面波有限差分数值模拟及波场分析[J].地球物理学进展,2009,24(4):1313.
[9]张剑锋.弹性波数值模拟的非规则网格差分法[J].地球物理学报,1998,41(增刊):357.
[10]孙卫涛,杨慧珠.地形构造中地震波传播的非对称交错网格模拟[J].应用数学和力学,2004,25(7):686.
[11]熊章强,张大洲,肖柏勋,等.裂缝介质中瑞雷面波传播的渐变非均匀交错网格数值模拟[J].湖南大学学报:自然科学版,2008,35(8):24.
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