ABSTRACT
Peaty ground distributed widely in Hokkaido, Japan, is an extremely soft ground, which is highly organic and has special engineering properties. Roads on peaty ground are usually designed to allow for a certain degree of settlement and are repaired and maintained during their service, since considerable settlement occurs over a long period of time in such roads. The Manual for Peaty Soft Ground Countermeasures (CERI, 2002) stipulates the allowable residual settlement as between 10 to 30 cm in three years after an expressway is placed in service. These values were, however, determined empirically and should be reconsidered for the minimization of the life cycle cost (LCC).
