Authors: A K Singh G C Mishra
Publish Date: 2013/08/04
Volume: 31, Issue: 5, Pages: 1555-1567
Abstract
Stability of a levee and its foundation soil during flood is governed by seepage forces In this study the seepage forces in the flow domain have been determined using conformal mapping technique Stability of foundation soil has been studied for a levee with and without cutoff wall on permeable soil of infinite depth In situ effective normal and shear stresses due to selfweight additional induced stresses due to levee structure and ponded water on upstream sloping face have been determined by assuming soil to be elastic Besides components of seepage stress acting at a point on two orthogonal planes ie on vertical and horizontal planes are considered and the Mohr’s circle is drawn Mohr–Coulomb failure envelope is drawn for the foundation soil with known effective cohesion cprime 1 and angle of internal friction varphiprime 1 and then the stability of the foundation soil has been assessed Probable zone of general shear failure considering seepage flow has been identified Zones vulnerable to foundation failure for different width of levee and depth of cutoff wall have been computed The hydraulic unstable zone in downstream side of the levee resembles a log spiral The provision of cutoff wall restricts the progress of failure zone only in the downstream side otherwise the zone of failure will enter the foundation of the levee The stability of the foundation soil of an existing ring levee along the rivers Ganga Sone and Punpun near Patna India has been evaluated
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