Abstract
The 32.80 m high homogeneous earth dam at Gararda in Rajasthan, across the Dungari Nallah, was completed in 2010 and was breached during the first filling of its reservoir. The post-breach soil investigation carried out on existing unbreached portion of earth dam predicted large variation in in situ bulk density and permeability values of soil fill. Thus, rehabilitation measures were suggested in the entire length of dam. In view of investigation and analysis carried out based on field and laboratory tests results, the existing dam section was modified by cutting downstream slope in 2.25 (H): 1 (V) from the top left edge to introduce a downstream filter with geotextile. In Gararda dam, unexposed geocomposite (geotextile + HDPE geomembrane + geotextile) has been used in upstream slope of dam as seepage barrier. This study illustrates various investigations and analysis procedure used in the rehabilitation of Gararda earth dam. The FEM simulation shows that modified dam section is safe under all flow conditions prescribed in the IS code. Results from current case study and from monitoring of instruments in the dam shall lead to growth in confidence of practicing engineers in sustainable applications of geosynthetics in dams.
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Choudhary, R.K. (2020). Rehabilitation of Breached Earth Dam Using GeoComposite—A Case Study. In: Kanwar, V., Shukla, S. (eds) Sustainable Civil Engineering Practices. Lecture Notes in Civil Engineering, vol 72. Springer, Singapore. https://doi.org/10.1007/978-981-15-3677-9_13
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DOI: https://doi.org/10.1007/978-981-15-3677-9_13
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