Abstract
Stones are employed in many cases as backfill material to reduce the earth pressure on the rear face of gravity mooring quays etc. At Shirashima Petroleum Storage Base rubble was used for sliding resistance against the wave pressures on a caisson type breakwater. In this study, large scale panel type earth pressure cells were used to measure the earth pressure in the rubble acting on the rear face of the caisson. The coefficient of earth pressure for the rubble had an average value of K=0.2.
