CAPPING SHEET FOR WASTE DISPOSAL SITE AND ITS CAPPING METHOD OF CONSTRUCTION

摘要

PPROBLEM TO BE SOLVED: To provide a capping sheet preventing slipping down of covered soil on a slope while reducing a treatment cost of leachate, and to provide a capping method of construction for a waste disposal site using the capping sheet. PSOLUTION: The capping sheet has a covered soil slipping down prevention layer comprising a three-dimensional mesh having a thickness of 5 mm or more and a fiber density of 20 kg/mSP3/SPto 200 kg/mSP3/SPon a protection layer side of a moisture-permeable water-proof sheet comprising a moisture-permeable water-proofing layer and a protection layer covering at least one. Further, in the capping sheet, the moisture-permeable water-proof layer is a member selected from a fine porous membrane, a nonporous moisture-permeable sheet, a melt-blown non-woven fabric and a flash-spinning non-woven fabric, and the protection layer comprises a long fiber non-woven fabric having a moisture permeability of 2,000 g/mSP2/SP/24 hour or more and water-resistance pressure of 50 kPa or more. Further, in the capping method of construction, the capping sheet is laid such that the three-dimensional mesh becomes a surface, and the covered soil layer is formed on it. PCOPYRIGHT: (C)2007,JPO&INPIT