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Geospatial and statistical interpolation of geotechnical data for modeling zonation maps of Islamabad, Pakistan

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Abstract

This study aims to create soil zonation maps (SZM) using a spatial interpolation approach relying on vast geotechnical subsoil data gathered through field and laboratory analysis. Islamabad, a rapidly growing city and capital of Pakistan, is used as a case study. The sub-soil data were evaluated from 210 geotechnical investigation reports in terms of soil type, standard penetration (SPT-N value), undrained shear strength, and consolidation parameters. The data were digitally analyzed in ArcGIS using the ordinary kriging interpolation technique, and SZM were developed based on SPT-N and soil type. For the developed SZM, settlement and allowable bearing capacity (ABC) are evaluated for shallow foundations. The results showed that the study area was divided into three main zones based on SPT-N [i.e., zone-1(4–15), zone-2(16–30), and zone-3(> 30)], and six sub-zones based on lithology. The lean/silty clay is predominant up to 15 m, underlain by gravel and shale/sandstone up to 50 m. Correlations were presented based on linear regression analysis with R2 = 0.98 to predict the SPT-N with depth for expeditious appraisal of stiffness and strength of sub-soils throughout preliminary planning and feasibility studies of several construction projects. The ABC for the shallow foundation in Islamabad found to be above 100 kPa, indicating an excellent safe ABC to support foundations of lightly loaded structures. Moreover, the correlation coefficient to predict SPT-N values is around 85%, while about 94% for soil type. Furthermore, reliable information on geotechnical properties of the subsoil’s layers will work as a complement for the site characterization and identification of hazard for upcoming projects.

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All data, models, and code generated or used during the study appear in the submitted article.

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Acknowledgements

This research work was supported by QWA Engineers and National Engineering Services (NESPAK) Pakistan by providing the geotechnical data of sites.

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This research received no external funding.

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The main idea was conceptualized by Waqas Hassan, whereas the methodology was defined by Waqas Hassan and Muhammad Naqeeb Nawaz. The data was collected by Muhammad Qasim. The software’s analysis was performed by Zain Ijaz. The original draft was prepared by Waqas Hassan, and reviewed and edited by Badee Alshameri. The overall work was carried out under supervision of Badee Alshameri.

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Correspondence to Waqas Hassan.

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Hassan, W., Alshameri, B., Nawaz, M.N. et al. Geospatial and statistical interpolation of geotechnical data for modeling zonation maps of Islamabad, Pakistan. Environ Earth Sci 81, 547 (2022). https://doi.org/10.1007/s12665-022-10669-2

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  • DOI: https://doi.org/10.1007/s12665-022-10669-2

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