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一、引言 剪切波速度是土动力学和地震工程学中的一个重要参数。目前,剪切波速度的原位测试方法大多采用体波(压缩波或剪切波)作为试验信号,而把瑞利波(简称R波)作为干扰信号处理。但在半空间中R波占表面振源能量的主要部分,其在浅层土体中所产生的位移远比体波的大。这种不合理性使得这些方法在浅层所测得结果的精度偏低。基于这一事实,笔者在前人研究工作基础上提出了利用R波测试剪切波速度,即表面波频谱分析法(简称SASW法)。本文阐述了该法的基本原理,并通过实例将其和跨孔法进行了比较。最后给出了工程应用实例。
I. INTRODUCTION Shear wave velocity is an important parameter in soil dynamics and seismic engineering. At present, in-situ test methods for shear wave velocity mostly use body waves (compression waves or shear waves) as test signals, and Rayleigh waves (abbreviated as R waves) as interference signals. However, in the half-space R-waves account for the major part of the surface vibration source energy, and its displacement in shallow soils is much larger than that of body waves. This irrationality makes the accuracy of the results measured at shallow levels in these methods low. Based on this fact, on the basis of previous research work, the author put forward the use of R-wave test shear wave velocity, surface wave spectrum analysis (SASW method). This article describes the basic principles of the method and compares it with the cross-hole method by using examples. Finally, an engineering application example is given.