A Simple Model for Factor of Safety in River Bank Stability Analysis: A Case Study in Lower Assam Region of River Brahmaputra.
Journal Title: International Journal of Engineering and Science Invention - Year 2018, Vol 7, Issue 8
Abstract
River bank erosion or the stream failure mechanism is a very complex fluvial process and it is the burning problem of Assam. In fluvial system, any bank failure occurs in one of the three main ways ( Fischenich 1989). They are hydraulic failures, geotechnical failures and combined failures. In hydraulic failures, the flowing water imparts tractive force on soil particles or bank materials and if this tractive force exceeds the critical shear stress for that particular stream bank, then the soil particles are removed from the bank thus erosion occurs. The most common and prominent mode of bank failure is the failure due to combination of hydraulic failures and geotechnical failures. Due to hydraulic force the bank materials are eroded away at the toe level resulting the soil mass overhanging or steepening in bank angle and ultimately the soil mass collapsed due overhanging and formation of tension cracks. A cantilever failure will occur if any of the overhanging blocks have a safety factor of less than one. In this work a very simple mathematical model is developed for factor of safety and results so obtained are found to be quite satisfactory in predicting the probability of erosion after applying in sixteen selected locations in lower Assam region of river Brahmaputra. The model has been developed by using the various bank erosion hazard parameters.
Authors and Affiliations
Nripen Mazumdar, Dr. Bipul Talukdar
Keywords
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