New Type of Cutoff Walls using SPSPs and WSMs in Waste Landfill Sites

摘要

H-H joint of “H-jointed SPSP with H-H joint”, which is made up of interlocking two H-steelrnsections of different sizes, is the one of SPSP’s joint to improve the hydraulic conductivity. “H-H jointed SPSPrnwith H-H joint” is expected to be applied to a vertical cutoff wall in coastal landfill sites. In H-jointed SPSP withrnH-H joint, the H-joint is completely imperviousness. H-H joint, however, is pervious at interlocked state because arngap of 8 to 11 mm is left between the interlocking flanges therefore a water interception treatment must bernconducted to seal the gap. The water shielding treatment of H-H joint is executed by coating the gaps with a waterswellingrnmaterial (WSM) before its installation. Then, hollow space is generated in H-H joint after treating byrnWSM, and that space can be used effectively. This paper proposes leachate control technologies using H-H jointrninterior space of SPSP cutoff walls. The possibility of those technologies and hydraulic conductivity of H-jointedrnSPSP with H-H joints are demonstrated by conducting the hydraulic conductivity test.