STANDARD FOR PROTECTION MATS CORRESPONDING TO FOUNDATION STONES OF IMPERMEABLE SHEET IN THE COASTAL WASTE DISPOSAL SITES

Abstract

At coastal areas where wave calmness cannot be secured, if revetments of coastal waste disposal sites are constructed using impermeable sheets, the sheets may not be laid in the shape as designed due to scouring of foundation stones. If large size stones are used to withstand scouring, impermeable sheets may be damaged by stone corners. In this study, the standard of protection mats, sandwiched between stone materials necessary for maintaining the impermeable sheet quality, was verified by laboratory experiment, field demonstration experiment, and FEM analysis. As a result, it was suggested that long-fiber nonwoven fabric with a basis weight of 1700g/m2 or more, placed under the impermeable sheet as a protective mat, can be used to withstand the overload up to 50 kPa.