Abstract
To evaluate the applicability of various stability estimation methods to submarine slopes during earthquakes, centrifugal model tests at 90 G with 45 m and 75 m water depth were conducted. Industrial clays with similar strength characteristics were used to prepare slope models instead of natural submarine clay. On a tilting table, pseudo static forces were applied to the slope and the seismic coefficient at the onset of failure was investigated. The shape of slip surface was also determined.
The slip surface was found to be similar to the toe circle failure and was shallower than the critical slip surface estimated by slope stability analysis. Other differences include a slightly larger seismic coefficient at the onset of failure, and deeper water. A slice analysis was conducted on the slope with the obtained slip surface using strength parameters obtained in the direct shear tests. The results indicate that the modified Fellenius method is capable of simulating the test results well.
