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Published in:
2018 | OriginalPaper | Chapter
Forensic Study on the Causes of Failure of Stone Columns Under Water Storage Tanks and Possible Remedial Measures
Author : Kaushik Bandyopadhyay
Published in: Geotechnics for Natural and Engineered Sustainable Technologies
Publisher: Springer Singapore
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Abstract
Water storage tanks of diameter 30 m and height 14.50 m were erected at a site near the coastal region of West Bengal. Detailed soil exploration work revealed that the deposit consisted of typical soft marine clay with standard penetration (SPT) values lying in the range of 2–6 up to 28.0 m depth below the ground level. Varying percentage of decomposed vegetation and laminated silt was observed between 11.50 and 28.00 m depth below EGL. Overall ground improvement was proposed, and accordingly, stone columns were installed up to the depth of 10.00 m below EGL. After one year of installation, total settlements of 800 mm and differential settlement of about 150 mm were observed and these have been continuing unabated. Subsequently, detailed forensic investigation was made, and it was observed that the stone columns had showed telltale signs of failure, and consequently, huge settlement resulted. The present paper discusses on the various causes of failure and suggests some remedial measures for arresting the settlements.