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Stability Analysis of an Earthen Embankment Dam with Internal Clay Core

Md. Mahmud Sazzad, Md. Mohayminul Islam

Abstract


This study aims at evaluating the effect of the material properties of dam, saturation conditions and seismic loads on the stability of earthen embankment dam with internal clay core by using Limit Equilibrium Method (LEM). The cross-section of two dimensional geometric model of the earthen embankment dam with internal clay core is incorporated in GEO5, a tool for analyzing the LEM based slope stability problems. The factor of safety of earthen embankment dam with internal clay core is calculated by using Bishop, Spencer, Fellenius, Janbu and Morgenstern-Price methods. From the analysis, it is observed that the property of clay used in the internal core of an earthen embankment dam is very important to stabilize a slope. Internal clay core imparts greater safety to the dam slope at dry condition than at saturated condition. If the clay of higher cohesion is used in internal core, it imparts the stability of slope rather than compromising its stability. It is also depicted that the application of seismic load at fully saturated condition is the most vulnerable condition for the stability of earthen embankment dam with internal clay core.     


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References


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