起伏地表条件下瑞雷波传播规律研究

Study on propagation of Raleigh Waves in the Condition of Rugged Surface

在对建筑场地土进行多道瞬态瑞雷波检测时会遇到起伏的地表地形条件,该地表地形条件会使得地震记录变得复杂,从而影响我们对地下情况的了解。针对常见的沟和垄两种地表地形条件进行瑞雷波的传播模拟,并从炮记录和频散曲线两个方面讨论其传播特征,模拟过程是利用高精度交错网格有效差分技术实现的。实验表明起伏地表地形条件会对能量的分配以及波形的转换产生影响,在检测时要尽量对其加以避让。

While applying the method of Muhichannel Analysis of Surface Waves （MASW） in the detection of foundation soil, the condition of rugged surface is often the case and it could make the shot - records complex and affect our understanding of underground. For two com- mon situations--groove and ridge, the law of propagation of Rayleigh waves is studied from two aspects of shot - records and dispersion curves and the simulation process has been achieved through high - order staggered - grid finite - difference operators. It is showed that rugged surface topography will affect the distribution of wave energy and waveform conversion, which should be avoided in the prospecting.