Geographic information system for the development of soil suitability map in south Chennai, India
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ORIGINAL PAPER
Geographic information system for the development of soil suitability map in south Chennai, India V. K. Stalin & R. B. Arun Murugan
Received: 8 August 2013 / Accepted: 7 February 2014 # Saudi Society for Geosciences 2014
Abstract The amount of subsurface information that can be effectively collected and manipulated is abundant. The use of information and database management system can help in the problem-solving process for the engineer. In this paper, south Chennai, India has been divided into four different zones. Subsequently, four zones between the village boundaries Kandanchavadi and Padur were selected to develop geotechnical zonation maps using geographical information system (GIS). Based on sampled geotechnical data values, an estimated value is assigned to all other locations using surface creation function (topo to raster interpolation process) in GIS. The study area was contoured for SPT N values and bearing capacity (kN/m2) at 0.75, 1.5, 2.25, 3, and 3.75 m depth. Information from various interpolation techniques has been checked by cross validation, and it also based on the fact that objects that are near are more accurate than those that are far away. SPT N values and bearing capacities for various footing breadths at different depths could be computed using this GIS map with varying levels of confidence. Foundation suitability map is developed by using weighted overlay analysis. This study realizes the potential of GIS to find the solution of phenomena, that was very tedious by any other means, not only in terms of accuracy but also by the use of derived information as the input for other correlation analysis. Furthermore, the system can be used as a decision support for geotechnical engineers. V. K. Stalin (*) : R. B. A. Murugan Department of Civil Engineering, College of Engineering Guindy, Anna University, Chennai 600 025, Tamil Nadu, India e-mail: [email protected] R. B. A. Murugan e-mail: [email protected]
Keywords Geographical information system . Arc GIS . SPT N value . Soil distribution . Bearing capacity . Foundation suitability
Introduction Geotechnical engineering project typically concentrate on the subsurface site condition and the interaction of man-made structure with the earth mass. For this purpose, the geotechnical engineer is required to collect a wide range of information. The sources of information are the subsurface data obtained from direct methods such as boring, test pits, plate load test, sounding, etc. and indirect methods such as electrical conductivity test, seismic refraction, etc. The multiple types of geotechnical data that is available are in various formats and are widely scattered. So, the use of information and database management system can help on the problemsolving process for geotechnical engineer and would be a cost-and time-effective. This necessitates the collection of enormous geotechnical data which is available in various sources and frame in a single geographical information systems (GIS) model that could be used by whole r
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