embankment_dams_james_l_sherard_contributions_tqac v1.0.0

Embankment Dams : James L. Sherard Contributions

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earth and rockfill embankment dams are vulnerable to failure under seismic loading. the failure can occur through a number of mechanisms. 1) when the frictional forces between the embankment and the rocks or soils are low, failure is through the fragmentation of the embankment. the subsoil materials are typically loose (sandy sand or gravel) and lack cohesion so it is often the case that a simple slipping between the base and the surface will lead to the embankment giving way. 2) when the frictional forces between the embankment and the rocks or soils are high, failure can occur through a number of mechanisms. the embankment may fail as a result of: (a) a local failure through material failure (b) a local failure through dam failure (c) a local failure through shrinkage of the embankment (d) a distal failure through the failure of the dam or rockfill material. 3) failure of embankments occurs frequently as a result of dam failure and although the proximate cause is often attributed to earthquake damage (provided that it happens in an area that is susceptible to damaging earthquakes) it is generally recognized that the initial cause of failure in all embankment dams is the compaction of the top of the embankment. after compacting, a well-cared-for embankment will tend to behave in a stiff and brittle manner in the field. such embankments tend to be more susceptible to any internal or external stress than a well-compacted embankment. 4) when dealing with a dam failure it is common to consider the dam wall failure and the embankment failure separately, however in a..


present embankment design practices are based on a 1950s approach to dam design that has been developed in the united states. while the formulae are generally recognized by engineers, there is little understanding of how they can be used by engineering designers to determine optimum sizing and performance of an embankment dam. this paper has two objectives. one is to summarize the theory of calculating stability of an embankment dam that has been developed for use by dam designers in the united states. the other is to use this theory to determine the effects of embankment dam dimensions on the stability of an embankment dam. the theory assumes that the embankment forms a rigid hydraulic “dome” above a permanent water surface. internal forces are applied to the embankment by water and the soil that is displaced from the embankment. the.. 84d34552a1