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1.BACKGROUND AND OBJECTIVES On March 2011, a mega-thrust earthquake occurred in offshore North East Japan. The subsequent tsunami caused hydrogen explosions at Fukushima Daiichi Nuclear Power Plant, and a large quantity of radioactive polluted soil and waste was generated. Geosynthetic clay liners (GCLs) are expected to act as a hydraulic barrier in the final cover system of disposal facilities for these polluted soil and waste. GCL is one of the water shielding bentonite liners and it has a low hydraulic conductivity because its inner bentonite swells as it absorbs water. In this study, a trap door test was conducted to investigate the behavior of overlapped GCLs subjected to differential settlements, under a small overburden pressure. Tank test was also performed to evaluate the hydraulic barrier performance of GCL overlap section. Besides, direct shear tests were conducted to investigate the frictional force which works between GCL and GCL, or GCL and Toyoura sand.

HYDRAULIC BARRIER PERFORMANCE OF OVERLAPPED GEOSYNTHETIC CLAY LINERS SUBJECTED TO DIFFERENTIAL SETTLEMENTS