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首页> 外文期刊>Pure and Applied Geophysics >Spatial Variability of the Depth of Weathered and Engineering Bedrock using Multichannel Analysis of Surface Wave Method
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Spatial Variability of the Depth of Weathered and Engineering Bedrock using Multichannel Analysis of Surface Wave Method

机译：基于表面波法多通道分析的风化基岩和工程基岩深度的空间变异性

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摘要

In this paper an attempt has been made to evaluate the spatial variability of the depth of weathered and engineering bedrock in Bangalore, south India using Multichannel Analysis of Surface Wave (MASW) survey. One-dimensional MASW survey has been carried out at 58 locations and shear-wave velocities are measured. Using velocity profiles, the depth of weathered rock and engineering rock surface levels has been determined. Based on the literature, shear-wave velocity of 330 ± 30 m/s for weathered rock or soft rock and 760 ± 60 m/s for engineering rock or hard rock has been considered. Depths corresponding to these velocity ranges are evaluated with respect to ground contour levels and top surface levels have been mapped with an interpolation technique using natural neighborhood. The depth of weathered rock varies from 1 m to about 21 m. In 58 testing locations, only 42 locations reached the depths which have a shear-wave velocity of more than 760 ± 60 m/s. The depth of engineering rock is evaluated from these data and it varies from 1 m to about 50 m. Further, these rock depths have been compared with a subsurface profile obtained from a twodimensional (2-D) MASW survey at 20 locations and a few selected available bore logs from the deep geotechnical boreholes.
机译：本文尝试使用多面波分析（MASW）评估印度南部班加罗尔的风化和工程基岩深度的空间变异性。已在58个地点进行了一维MASW测量，并测量了剪切波速度。使用速度剖面，可以确定风化岩石的深度和工程岩石的表面水平。根据文献，风化岩石或软岩石的剪切波速度为330±30 m / s，工程岩石或硬岩石的剪切波速度为760±60 m / s。相对于地面轮廓水平评估与这些速度范围相对应的深度，并已使用自然邻域通过插值技术绘制了顶面水平。风化岩石的深度从1 m到大约21 m不等。在58个测试位置中，只有42个位置达到了剪切波速度超过760±60 m / s的深度。根据这些数据评估工程岩石的深度，其范围为1 m至约50 m。此外，已将这些岩石深度与从20个位置的二维（2-D）MASW测量获得的地下轮廓以及从深部岩土钻孔中选择的一些可用钻孔测井数据进行了比较。

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