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<p>This paper presents a comprehensive GIS-based analysis of the geotechnical characteristics of soil of Guwahati, Assam, India. Using data from 607 exploratory boreholes to a depth of 18&#xa0;m, detailed field and laboratory analyses were made to analyze soil parameters such as grain size distribution, corrected Standard Penetration Test (SPT) N-values, cohesion, and internal friction angles. Soil samples were grouped into separate geo-units depending on grain size distribution, from the mostly fine-grained soils to gravelly soils and weathered rock. Spatial interpolation was conducted using the Inverse Distance Weighted (IDW) technique in QGIS, generating in-depth depth-specific maps of geo-units within the study area. Findings indicated that the top layers up to 7.5&#xa0;m are largely composed of fine-grained soils, whereas lower strata between 7.5&#xa0;m and 18&#xa0;m are largely made up of moderately coarse-grained soils. These new spatial maps give valuable information on the geotechnical soil profile of Guwahati, greatly benefiting local engineers and urban planners in planning, designing, and safe implementation of infrastructure projects. This study bridges an important gap by providing the first detailed, geographically interpolated grain-size distribution geotechnical maps for Guwahati City, emphasizing their utility for infrastructure development and hazard reduction.</p>

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Geotechnical characterization and GIS-integrated soil zonation for urban planning in Guwahati City, Northeast India

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Nabanita Sharma,
  • Diganta Goswami,
  • Jayanta Pathak

摘要

This paper presents a comprehensive GIS-based analysis of the geotechnical characteristics of soil of Guwahati, Assam, India. Using data from 607 exploratory boreholes to a depth of 18 m, detailed field and laboratory analyses were made to analyze soil parameters such as grain size distribution, corrected Standard Penetration Test (SPT) N-values, cohesion, and internal friction angles. Soil samples were grouped into separate geo-units depending on grain size distribution, from the mostly fine-grained soils to gravelly soils and weathered rock. Spatial interpolation was conducted using the Inverse Distance Weighted (IDW) technique in QGIS, generating in-depth depth-specific maps of geo-units within the study area. Findings indicated that the top layers up to 7.5 m are largely composed of fine-grained soils, whereas lower strata between 7.5 m and 18 m are largely made up of moderately coarse-grained soils. These new spatial maps give valuable information on the geotechnical soil profile of Guwahati, greatly benefiting local engineers and urban planners in planning, designing, and safe implementation of infrastructure projects. This study bridges an important gap by providing the first detailed, geographically interpolated grain-size distribution geotechnical maps for Guwahati City, emphasizing their utility for infrastructure development and hazard reduction.