Use of GIS Based Maps for Preliminary Assessment of Subsoil of Guwahati City

Abstract

Guwahati, the major city in the North Eastern region of India is growing rapidly in every aspect with major infrastructures like sports complex, educational institutions, hospitals, flyovers, multiplex halls, etc. Knowledge of the subsurface soil condition is necessary to ensure the structural safety and serviceability of the above mentioned structures before any construction. Therefore, contour maps of Standard penetration test N value, ground water table and shear wave velocity map using Geographical Information System (GIS) platform will be of great help to the foundation designers at the initial stage for site selection and preliminary foundation design under static and seismic condition. Contour maps of Standard penetration test N value at different depth and average contour map of N value of Guwahati city have been prepared. Standard penetration Test N values and depth of water table were taken from a data base of 200 boreholes up to 30 meter depth to prepare N value contour map of Guwahati city. A regression equation between shear wave velocity Vs and Standard penetration test N value based on twenty seven previous similar correlations was also developed. This regression equation was used to determine shear wave velocity of Guwahati city. The average shear wave velocities for 30 m depth for all locations had been determined and used to generate map on (GIS) platform. Other subsurface geotechnical information of Guwahati city like soil classification and depth to water level from ground surface is also presented in the form of GIS based maps in order to form a data base.

Static and dynamic characterization and response analysis of soils from northern India

“…Researchers have carried out deterministic and probabilistic seismic hazard analyses and seismic microzonation studies in different cities in India (Kandpal et al [2], Anbazhagan et al [3] Sharma et al [4]). Wiemer et al [5] conducted site-specific seismic hazard analyses of nuclear power plants.…”

Geological-Geotechnical Database from Standard Penetration Test Investigations Using Geographic Information Systems

“…between N-value and V S were applied and studied in 2006 in Yenişehir/Turkey [6], in 2008 in Bangalore/India [7]; in 2011 in Mumbai/India [8]; in 2012 in Hamedan/Iran [9]; in 2013 [10] and 2016 [11] in the city of Guwahati/India.…”

“…In 2012, [16] developed a map of N-value contour lines to assist in the design of foundations projects in the city of Rajshahi/Bangladesh, with the purpose of assisting in the design of small and low-cost structures. In 2013, [10] proposed the mapping of N-value and groundwater depth in the city of Guwahati/India. This study was carried out from a database of 200 SPT boreholes, covering 262 km 2 .…”

Evaluating the Geotechnical and Geophysical Characteristics of Expanding Districts in Tehran Using Field Experiments

“…In these studies, 200 boreholes were drilled to a depth of 30 meters based on the data. According to the results of field trials such as Lefranc and SPT and the results of geophysical intrusions and experimental results, geotechnical zoning maps have been plotted based on GIS [4]. Wan-Mohamad et al (2011) studied geotechnical data and geotechnical zoning using geotechnical data of boreholes drilled in the Perak Tengah, Sri Lanka using GIS [5].…”