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首页> 外文会议>Geo-congress >Application of Microtremor Horizontal to Vertical Spectra Ratio (MHVSR) and Multichannel Analysis of Surface Wave (MASW) for Shallow Bedrock Mapping for Transportation Projects
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Application of Microtremor Horizontal to Vertical Spectra Ratio (MHVSR) and Multichannel Analysis of Surface Wave (MASW) for Shallow Bedrock Mapping for Transportation Projects

机译：微调水平垂直光谱比率（MHVSR）与浅层基岩测绘对地面波（MASW）的应用

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摘要

Mapping bedrock layers and their stiffness is an important part of geotechnical site characterization, particularly for highway projects that require significant rock excavation. A variety of invasive and non-invasive techniques can be used for this purpose. In this study, microtremor horizontal to vertical spectra ratio (MHVSR) and multichannel analysis of surface wave (MASW) methods were utilized along a proposed highway alignment, where the bedrock conditions are expected to be very shallow and highly variable. Two/three peaks were observed for the majority of the MHVSR measurements. The origin of the peaks was investigated using the proposed eye shape method in the literature and it was observed that an eye-shape spectral pattern is not always an accurate indicator of a peak with stratigraphic origin. MHVSR peaks in this study were determine to be of stratigraphy origin as they correspond well with the sharp impedance contrasts in the Vs profiles and subsurface layering from the boring logs. It seems that for cases of MHVSR with multiple peaks at very shallow bedrock sites, the peaks are reliable and they typically have a stratigraphy origin. This suggests that the MHVSR technique is a suitable non-destructive, rapid, and cost-effective alternative for traditional drilling and sampling for shallow bedrock mapping.
机译：映射基岩层及其僵硬是岩土现场表征的重要组成部分，特别是对于需要大量岩石挖掘的公路项目。可以使用各种侵入性和非侵入性技术。在该研究中，利用了水平到垂直光谱比（MHVSR）和表面波（MasW）方法的多通道分析的微调，其中沿着提出的公路对准，预期基岩条件是非常浅的和高度变化的。对于大多数MHVSR测量，观察到两种/三个峰。使用所提出的眼部形状方法在文献中研究了峰的起源，并且观察到眼形光谱图案并不总是具有地层来源的峰的准确指示。本研究中的MHVSR峰被确定为地层来源，因为它们对应于VS简档中的尖锐阻抗和来自钻孔原木的地下分层。似乎对于在非常浅的基岩部位的MHVSR的情况下，峰值是可靠的，并且通常具有地层起源。这表明MHVSR技术是一种合适的无损，快速，经济高效的替代方案，用于浅基岩映射的传统钻井和采样。

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