Soil characterization using electrical resistivity tomography and geotechnical investigations |
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| Authors: | Kumari Sudha M Israil S Mittal J Rai |
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| Institution: | 1. Water Research Institute (IRSA), CNR, Bari, Italy;2. Dipartimento di Geoscienze, Università di Padova, Italy;3. Dipartimento dei Beni Culturali: archeologia, storia dell''arte, del cinema e della musica, Università di Padova, Italy;1. Geotomo Software, 115 Cangkat Minden Jalan 6, 11700 Gelugor, Penang, Malaysia;2. British Geological Survey, Natural Environment Research Council, Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK;3. hydroGEOPHYSICS, Inc., 2302 N Forbes Blvd., Tucson AZ 85745, USA;1. British Geological Survey, Keyworth, Nottingham NG12 5GG, United Kingdom;2. University of Portsmouth, School of Earth & Environmental Sciences, Portsmouth PO1 3QL, United Kingdom;3. Geotomo Software Sdn. Bhd., 115, Cangkat Minden Jalan 5, Minden Heights, 11700 Gelugor, Penang, Malaysia;1. Departamento de Ingeniería Minera, Geológica y Cartográfica, Technical University of Cartagena, Paseo Alfonso XIII, 52, 30203 Cartagena, Murcia, Spain;2. ESCET, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933, Móstoles, Madrid, Spain;1. Faculty of Geology, University of Warsaw, ul. ?wirki i Wigury 93, 02-089 Warsaw, Poland;2. Faculty of Civil Engineering, Warsaw University of Technology, ul. Armii Ludowej 16, 00-637 Warsaw, Poland;3. UMR CNRS 8148 GEOPS, Département des Sciences de la Terre, Université de Paris-Sud, 91405 Orsay, France;1. Institut des Sciences de la Terre d''Orleans, UMR 7327, University of Orléans, CNRS, BRGM 1A rue de la Férollerie, 45071 Orléans Cedex, France;2. IFSTTAR, GERS, GeoEND, F-44344 Bouguenais, France;3. Univ. Lyon/IFSTTAR/GERS, F-69675 Lyon, France;4. LPG, UMR CNRS 6112, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes, France;5. IFSTTAR, GERS, F-44344 Bouguenais, France |
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| Abstract: | Electrical Resistivity Tomography (ERT) has been used in association with Standard Penetration Test (SPT) and Dynamic Cone Penetration Test (DCPT) for Geotechnical investigations at two sites, proposed for thermal power plants, in Uttar Pradesh (UP), India. SPT and DCPT tests were conducted at 28 points and two ERT profiles, each measuring 355 m long, were recorded using 72 electrodes deployed at 5 m spacing. Electrical characterization of subsurface soil was done using borehole data and grain size analysis of the soil samples collected from boreholes. The concept of electrical resistivity variation with soil strength related to the grain size distribution, cementation, porosity and saturation has been used to correlate the transverse resistance of soil with the number of blow counts (N-values) obtained from SPT and DCPT data. It was thus observed that the transverse resistance of soil column is linearly related with the number of blow counts (N-values) at these sites. The linear relationships are site-specific and the coefficients of linear relation are sensitive to the lithology of subsurface formation, which was verified by borehole data. The study demonstrates the usefulness of the ERT method in geotechnical investigations, which is economic, efficient and less time consuming in comparison to the other geotechnical methods, such as SPT and DCPT, used for the purpose. |
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