The Behavior of Ambad Earth Dam Under Change in Water Level and Earthquake

This study presents a dynamic analysis and effect of a change in water level on a zoned earth dam subjected to earthquake motion in which pore water pressure, effective stresses, and displacements are calculated. The finite element method is used in the analysis of the Earth dam. As a case study, the Ambad dam is selected, which is located on the Ambad River in Nashik district of Maharashtra and constructed of the zoned embankment, it has a total length of 0.946 km. The height of the dam is 26.85 m. In the first case of analysis, different magnitudes of earthquakes such as 5.4 and 8.8 are considered for a period of 10 s. The second case is the change in the water level like rapid drawdown and slow drawdown conditions are considered. It is concluded that the value of pore water pressure generated at the base of the core is greater than that in the upper parts of the dam, the stress increases during the earthquake and change in water-level analysis which indicates that the soil continues to weaken during this period, the horizontal displacement increases with the depth of the point of the crest and the largest horizontal displacement will be at the base of the dam at the time of the earthquake and there is an attenuation of the acceleration to some degree depending on the amplitude of the input horizontal acceleration. To improve the stability, a factor of safety, stress and its displacement in this project use the geogrid and grouting technique.