I have been asked to evaluate the liquefaction potential of the soil surrounding a 48" diameter pipe as a result of installing sheet piles via a vibratory hammer.
A sheet pile cofferdam is proposed approximately 10 feet away from the pipe. The soil consists of alternating layers of silty clay and fine to medium grained sands on top of sandstone which is 30' below grade. The water table is 10' below grade. The bottom of pipe is in the fine to medium grained sand and resides below the water table. N-values in the sand are between 10 and 15.
At 10', is the 48" pipe in danger of settlement due to liquefaction? Are there any papers that address this type of problem? Any help would be greatly appreciated.