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首页> 外文会议>Geotechnical frontiers >The Use of Two Dimensional (2D) Multichannel Analysis of Surface Waves (MASW) Testing to Evaluate the Geometry of an Unknown Bridge Foundation
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The Use of Two Dimensional (2D) Multichannel Analysis of Surface Waves (MASW) Testing to Evaluate the Geometry of an Unknown Bridge Foundation

机译：使用表面波的二维（2D）多通道分析（MASW）测试来评估未知桥梁基础的几何形状

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The evaluation of subsurface geometry continues to be a major issue for the thousands of bridges across the country with unknown foundations. These bridges pose a threat to the vitality of the nation's infrastructure, particularly given the difficulties in establishing their vulnerability to scour. In addition, unknown foundations present a major barrier to foundation reuse and rehabilitation. In many cases, geophysical methods can provide a suitable measure of confidence regarding the geometry of these unknown foundations. The multichannel analysis of surface waves (MASW) technique presents a number of potential advantages to evaluate unknown foundation geometry, including increased signal to noise ratio and ability to resolve stiffness inversions. However, very few studies have examined the use of MASW to specifically evaluate unknown bridge foundations. This gap in the literature may be related to concerns regarding vertical and lateral resolution. For example, vertical resolution decreases as the surface waves sample deeper material and the phase velocities are determined by materials over a greater depth range. Additionally, MASW largely averages out lateral variations in stiffness because a layered earth model is used in the data processing. MASW was utilized in this study to determine the two-dimensional (2D) shear wave velocity (V_s) profile over a bridge foundation. The purpose of this testing was to examine the viability of MASW when evaluating unknown bridge foundations, particularly with regards to vertical and lateral resolution. Generally, the results demonstrated that MASW is capable of providing a conservative estimate of depth. MASW proved more capable in accurately assessing the lateral dimension of an embedded foundation, though the results were a function of the survey parameters used during 2D testing.
机译：对于全国各地成千上万基础不明的桥梁而言，地下几何形状的评估仍然是一个主要问题。这些桥梁对国家基础设施的生命力构成威胁，特别是考虑到难以建立冲刷脆弱性时。此外，未知的基金会对基金会的重用和修复构成了主要障碍。在许多情况下，地球物理方法可以对这些未知地基的几何形状提供合适的置信度度量。表面波多通道分析（MASW）技术具有评估潜在基础几何形状的许多潜在优势，包括增加的信噪比和解决刚度反演的能力。但是，很少有研究检查过使用MASW专门评估未知桥梁基础的情况。文献中的这一差距可能与对垂直和横向分辨率的关注有关。例如，垂直分辨率随着表面波对更深材料的采样而降低，并且相速度由更大深度范围内的材料确定。此外，由于在数据处理中使用了分层地球模型，因此MASW可以在很大程度上消除刚度的横向变化。在这项研究中，MASW被用于确定桥梁基础上的二维（2D）剪切波速度（V_s）轮廓。该测试的目的是在评估未知桥梁基础时，尤其是在垂直和横向分辨率方面，检查MASW的可行性。通常，结果表明MASW能够提供保守的深度估计。尽管结果是2D测试期间使用的测量参数的函数，但事实证明，MASW能够更准确地评估嵌入式基础的横向尺寸。

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