DESIGN CRITERIA FOR PERMANENT DEFORMATION OF SUBGRADE SOILS IN FIEXIBLE PAVEMENTS FOR LOW-VOLUME ROADS

摘要

Subgrade soils contribute to surface rutting and fatigue cracking, the two major distress modes in flexible pave- ments. Rutting and cracking are accumulated damages done to the pavement structures over load repetitions and are irrecoverable in nature. Current transfer functions used in the mechanistic-based design methods relate these plastic phenomena solely modes is reviewed. In this paper, the philosophy of the connection between subgrade and pave- ment distress modes is reviewed.