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Geological and geotechnical studies around Kaswati Dam, Kachchh, India; implications on tectonic stability, rock mass property and water retention capacity

Niladri Bhattacharjee and Sarada Prasad Mohanty
Geological and geotechnical studies around Kaswati Dam, Kachchh, India; implications on tectonic stability, rock mass property and water retention capacity
Quarterly Journal of Engineering Geology and Hydrogeology (April 2018) 51 (3): 338-351

Abstract

The Kachchh region, located in the highest seismicity belt of peninsular India, has undergone continuous tectonism along regional faults since Mesozoic times. The Kaswati dam, situated between two asymmetrical domes, witnessed a M (sub w) 7.6 earthquake in 2001. The present investigation was carried out around the dam site to assess the cause of geotechnical hazards (ground motion amplification, soil liquefaction, landslide and surface ruptures) that occurred during the earthquake. Analyses of the spatial distribution of discontinuities, their relationship with deformed litho-units and different parameters of discontinuities (i.e. spacing, orientation, persistence, aperture, roughness, filling and weathering) were undertaken to characterize rock mass properties and seepage over time. Measured joint frequency, joint volume, block volume and block shape factor provide quantified data on the degree of jointing, shape and size of the block, Rock Quality Designation, Rock Mass Rating, Geological Strength Index and hydraulic aperture. The coefficient of permeability was determined from rock discontinuities to estimate the amount of seepage of water through rock joints. Rock mass characterization and water retention capacity were measured via an indirect method, which might be useful during the preliminary study of site characterization and produce accurate results at very low cost.


ISSN: 1470-9236
EISSN: 2041-4803
Serial Title: Quarterly Journal of Engineering Geology and Hydrogeology
Serial Volume: 51
Serial Issue: 3
Title: Geological and geotechnical studies around Kaswati Dam, Kachchh, India; implications on tectonic stability, rock mass property and water retention capacity
Affiliation: Indian Institute of Technology (Indian School of Mines), Department of Applied Geology, Dhanbad, India
Pages: 338-351
Published: 20180430
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 50
Accession Number: 2018-052787
Categories: Engineering geologySeismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 9 tables, geol. sketch maps
N23°34'60" - N23°34'60", E70°00'00" - E70°00'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201828
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