Abstract In the present work, Jamshedpur city, Jharkhand, India, situated within a significant portion of the Chotanagpur plateau, has been chosen to examine the subsurface profiles and variation of shear wave velocity through a geotechnical and geophysical investigation process. Geophysical investigation using MASW testing was conducted at 33 different locations across the study area to estimate the shear wave velocity profiles and depth of subsurface layers. Geotechnical investigation was performed involving the drilling of 37 boreholes across 25 distinct locations to acquire SPT-N values at various depths and to analyze the subsurface soil profiles. Based on the results, it has been observed that the depth of subsurface layers obtained from the MASW survey and the soil strata identified from the borehole data show a very close resemblance for almost all survey locations within the study region. A new empirical correlation between shear wave velocity (SWV), Vs and uncorrected standard penetration resistance (SPT-N) values has been proposed using 21 relatively closed-spaced MASW and SPT-N tests using nonlinear regression analysis. The proposed correlation has been validated to employ the prediction capability of the proposed relation based on statistical assessment, graphical methods, and comparison with existing correlations. It has been seen that about 85% Vs values obtained from proposed correlation were predicted within 10% error of margin, indicating a better estimation of the proposed relation. The proposed relation can be recommended for soil profile study, dynamic site response assessment, and site characterization for the entire Chotanagpur plateau region and can be compared to measure Vs. Article Highlights <UnorderedList Mark="Bullet"> <ItemContent> We have conducted a detailed study for Jamshedpur city, India using both geotechnical (37 boreholes) and geophysical (33 MASW) investigation to assess subsurface profiles and shear wave velocity variations. </ItemContent> <ItemContent> We have proposed a novel empirical correlation between shear wave velocity (Vs) and uncorrected SPT-N values, based on 21 closely-spaced MASW and borehole tests. </ItemContent> <ItemContent> The proposed correlation has been validated to employ the prediction capability of the proposed relation based on statistical assessment, graphical methods, and comparison with existing correlations. </ItemContent> <ItemContent> The proposed correlation is recommended for soil profile study, dynamic site response assessment, and site characterization across the Chotanagpur plateau region, offering a valuable tool for measuring Vs. </ItemContent> </UnorderedList>

Subsurface investigation and statistical relation using SPT-N values and shear wave velocity for Jamshedpur, India

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发表日期：

2025年8月31日

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Suryakant Kumar Sisodiya,
Ashhad Imam,
Awdhesh Kumar Choudhary,
Keshav Kumar Sharma

摘要

Abstract

In the present work, Jamshedpur city, Jharkhand, India, situated within a significant portion of the Chotanagpur plateau, has been chosen to examine the subsurface profiles and variation of shear wave velocity through a geotechnical and geophysical investigation process. Geophysical investigation using MASW testing was conducted at 33 different locations across the study area to estimate the shear wave velocity profiles and depth of subsurface layers. Geotechnical investigation was performed involving the drilling of 37 boreholes across 25 distinct locations to acquire SPT-N values at various depths and to analyze the subsurface soil profiles. Based on the results, it has been observed that the depth of subsurface layers obtained from the MASW survey and the soil strata identified from the borehole data show a very close resemblance for almost all survey locations within the study region. A new empirical correlation between shear wave velocity (SWV), V_s and uncorrected standard penetration resistance (SPT-N) values has been proposed using 21 relatively closed-spaced MASW and SPT-N tests using nonlinear regression analysis. The proposed correlation has been validated to employ the prediction capability of the proposed relation based on statistical assessment, graphical methods, and comparison with existing correlations. It has been seen that about 85% V_s values obtained from proposed correlation were predicted within 10% error of margin, indicating a better estimation of the proposed relation. The proposed relation can be recommended for soil profile study, dynamic site response assessment, and site characterization for the entire Chotanagpur plateau region and can be compared to measure V_s.

Article Highlights

We have conducted a detailed study for Jamshedpur city, India using both geotechnical (37 boreholes) and geophysical (33 MASW) investigation to assess subsurface profiles and shear wave velocity variations.

We have proposed a novel empirical correlation between shear wave velocity (V_s) and uncorrected SPT-N values, based on 21 closely-spaced MASW and borehole tests.

The proposed correlation has been validated to employ the prediction capability of the proposed relation based on statistical assessment, graphical methods, and comparison with existing correlations.

The proposed correlation is recommended for soil profile study, dynamic site response assessment, and site characterization across the Chotanagpur plateau region, offering a valuable tool for measuring V_s.