3D Static and seismic slope stability analyses at Treasure Island

The following article by Dr Robert Pyke provides some background on the use of 3D slope stability analyses and then illustrates use of TSLOPE to evaluate both static and seismic stability of Treasure Island, a man-made island in San Francisco Bay.  This case history shows how 3D analyses can make a difference, even when there is a long slope of the kind that we have always assumed can be satisfactorily analysed in 2D.  It also illustrates use of a robust screening analysis for seismic deformations in those cases where materials do not lose strength as a result of cyclic loading in an earthquake.