ONENGINEER
Geotechnical
- Oct 13, 2011
- 284
RDD anaylses are conducted on an old 15 m high embankment dam made of one zone fat clay with 2.3:1 slopes. The factor of safety for 2.5 days drawdown is ~ 0.25, using soil parameters obtained from a recent site investigation. This low fos seems to be very critical for a dam that has been there for 65 years with no known failure history. One assumption is that there was never a RDD need and hence no failure was experienced. Another assumption is that the analysis has overlooked an item or criteria that led to calculate this[tt][/tt] low fos. In the latter case, I would appreciate feedbacks for what might have gone strategically wrong in the analysis to obtain such a low fos. Thank you.