Kim Gunwoong, Hwang Sungmoon
Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Republic of Korea.
Department of Civil, Architectural, and Environmental Engineering, University of Texas at Austin, Austin, TX 78712, USA.
Sensors (Basel). 2024 May 19;24(10):3231. doi: 10.3390/s24103231.
The nondestructive spectral analysis of surface waves (SASW) technique determines the shear wave velocities along the wide wavelength range using Rayleigh-type surface waves that propagate along pairs of receivers on the surface. The typical configuration of source-receivers consists of a vertical source and three vertical receivers arranged in a linear array. While this approach allows for effective site characterization, laterally variable sites are often challenging to characterize. In addition, in a traditional SASW test configuration system, where sources are placed in one direction, the data are collected more on one side, which can cause an imbalance in the interpretation of the data. Data interpretation issues can be resolved by moving the source to opposite ends of the original array and relocating receivers to perform a second complete set of tests. Consequently, two different Vs profiles can be provided with only a small amount of additional time at sites where lateral variability exists. Furthermore, the testing procedure can be modified to enhance the site characterization during data collection. The advantages of performing SASW testing in both directions are discussed using a real case study.
表面波无损光谱分析（SASW）技术利用沿地表成对接收器传播的瑞利型表面波，确定宽波长范围内的剪切波速度。典型的源 - 接收器配置由一个垂直源和三个呈线性排列的垂直接收器组成。虽然这种方法能够有效地进行场地特性描述，但横向变化的场地通常难以进行特性描述。此外，在传统的SASW测试配置系统中，源放置在一个方向，数据更多地在一侧收集，这可能导致数据解释的不平衡。通过将源移动到原始阵列的相对端并重新安置接收器以执行第二组完整测试，可以解决数据解释问题。因此，在存在横向变化的场地，只需少量额外时间就能提供两个不同的剪切波速度（Vs）剖面。此外，可以修改测试程序以在数据收集期间增强场地特性描述。通过一个实际案例研究讨论了在两个方向上进行SASW测试的优点。
