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Application of Kriging for development of SPT N value contour maps and USCS-based soil type qualitative contour maps for Islamabad, Pakistan
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Application of Kriging for development of SPT N value contour maps and USCS-based soil type qualitative contour maps for Islamabad, Pakistan
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Application of Kriging for development of SPT N value contour maps and USCS-based soil type qualitative contour maps for Islamabad, Pakistan
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Journal Article
Application of Kriging for development of SPT N value contour maps and USCS-based soil type qualitative contour maps for Islamabad, Pakistan
2021
Overview
Geotechnical maps provide preliminary knowledge of sub-surface parameters which help in hazard identification, planning of detailed investigations, mitigation measures, and design for engineering projects. Maps consisting of zones with generalized stratigraphy for an entire area provide uncertain information which may lead to overlooking subsurface geotechnical hazards. In contrast, continuous contour plots consider spatial variation with depth. The purpose of this paper is to make efficient SPT N-value digital maps and soil type maps classified using Unified Soil Classification System (USCS) that indicate N value and soil type at unsampled locations in Islamabad, Pakistan. The geostatistical Kriging approach is unprecedently applied to Islamabad (Pakistan) to develop the contours. The proposed methodology involves integrating geotechnical data with contouring software Surfer 18. Data from fifty geotechnical investigation reports were used to create contour plots of twelve soil types and SPT N values at 3, 5, 10, 15, 20, and 25 ft depth intervals. In addition, a map indicating the depth of groundwater was also developed. The geotechnical contour maps presented in this paper are the first of their kind for Islamabad and lie consistent with geological generalizations of the region. A coefficient of correlation of 0.88 was found for SPT N-values. The output will serve as a supplement for site characterization and hazard identification for future projects.
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