Soil Profiling at the Geotechnical Experimentation Site of Treasure Island, CA

剪切波的速度是 与刚度直接相关 和密度 波通过的材料 传播。 有可能 关联的材料属性， 土壤存款到测得的剪切 波速和精确剪切 波速剖面是 被认为是提供必要的 评估的数据 土壤沉积物的动态响应， 特别是强震时 地动山摇 现有的测量方法 剪切波速 存款，如稳态 瑞雷波法（SSRW）和 面波谱分析 方法（SASW），具有其 局限性。 这一目标 项目是调查在 金银岛岩土工程 试验场能力 一种新的方法，称为 受控源光谱 面波分析（CSSASW）， 它结合了SSRW的特点 和SASW方法。 金银岛，属于 美国海军是一座人造岛 毗邻Yerba Buena岛， 旧金山弗朗西斯科湾。 海军是 在这个岛上建一个遗址 可用于基础研究， 土的动力响应 地震沉积 强烈的地面运动， 一般岩土工程 实验-如本项目 调查使用 现场CSSASW法 特征化 预计 这个实验也将 提供额外的有价值的 地下数据在这个宝藏 岛的网站，这将有助于 使用本网站作为 国家岩土工程设施 工程研究

The velocity of a shear wave is directly related to the stiffness and density of the geotechnical material through which the wave propagates. It is possible to correlate material properties of a soil deposit to the measured shear wave velocity; and accurate shear wave velocity profiles are recognized as providing essential data on which to evaluate the dynamic response of soil deposits, in particular to strong earthquake ground shaking. Existing methods for measuring shear wave velocities through soil deposits, such as the steady-state Rayleigh wave method (SSRW) and the spectral-analysis-of-surface-waves method (SASW), have their limitations. An objective of this project is to investigate at the Treasure Island geotechnical experimentation site the capability of a new method, referred to as the controlled-source spectral- analysis-of-surface-waves (CSSASW), which combines features of the SSRW and SASW methods. Treasure Island, which belongs to the U.S. Navy, is a man-made island adjacent to Yerba Buena Island in San Francisco Bay. The Navy is making a site on this island available for basic research into the dynamic response of soil deposits to earthquake-induced strong ground motions, and for general geotechnical engineering experiments - such as this project to investigate the use of the CSSASW method for site characterization. It is expected that this experiment will also provide additional valuable subsurface data at this Treasure Island site which will contribute to the use of this site as a national facility for geotechnical engineering research.