Spatial Variability of the Depth of Weathered and Engineering Bedrock using Multichannel Analysis of Surface Wave Method |
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| Authors: | P Anbazhagan T G Sitharam |
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| Institution: | (1) Department of Civil Engineering, Indian Institute of Science, Bangalore, 560 012, India |
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| Abstract: | 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 two-dimensional (2-D) MASW survey at 20 locations and a few selected available bore logs from the deep geotechnical
boreholes. |
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| Keywords: | MASW shear-wave velocity weathered rock engineering rock and rock depth |
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