Slope stability for dredging

[Okiryu]

Sorry, I understand that double posting is not allowed, but I posted this question in the offshore engineering forum and realized that the slope stability forum is more appropriate for this question:

Hi, does anybody has any references for underwater slope stability? This is for a dredging project in soft clays and loose sand soils. Thanks !

 

[Lomarandil]

I once wrote a literature review for grad school on (dynamic) slope stability methods -- and included some research on submarine slopes.

It probably isn't much of a leg up (more academic than practical), but might be a start.

I referenced the following papers:
Azizian A and Popescu R. Three-dimensional seismic analysis of submarine slopes. Soil Dynamics and Earthquake Engineering 2006;26;870-887.
Biondi G, Cascone E, Maugeri M, Motta E. Seismic response of saturated cohesionless slopes. Soil Dynamics and Earthquake Engineering 2000;20:209-215.
Biondi G, Cascone E, Maugeri M. Flow and deformation failure of sandy slopes. Soil Dynamics and Earthquake Engineering 2002;22:1103-1114.
Biscontin G, Pestana JM, Nadim F. Seismic triggering of submarine slides in soft cohesive soil deposits. Marine Geology 2004;203:341-354.
Dan G et al. Quantifying the role of sandy-silty sediments in generating slope failures during earthquakes; example from the Algerian margin. Int. Journal of Earth Science 2009;98:769-789.
Wright SG and Rathje EM. Triggering Mechanisms of Slope Instability and their Relationship to Earthquakes and Tsunamis. Pure and Applied Geophysics 2003;160:1865-1877.

From the little commentary I made in my notes at the time, I'd expect the Biondi papers to be most relevant for practical work -- sounds like it was an extension of Newmark's method.

 

[Okiryu]

Thanks Lomarandil. For your research, did you have the chance to run some underwater slope stability analysis? I am just curious what parameters (other than shear strength of course) I have to be cautious at.

 

[Lomarandil]

No, that lit review was separate from the main focus of my research, so I never got further into it.

 

[ATSE]

Prof Duncan has written about the underwater slope failure at the San Francisco LASH terminal failure (1970) in the ASCE paper "Factors of Safety and Reliability in Geotechnical Engineering" JGGE April 2000. 10 pages.

 

[Okiryu]

ATSE, thanks. Yes, I remember that paper and recall see that case in the paper. I will take a look at that paper again. Thanks for the reminder.