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Compacted soil mixed with bentonite having a low hydraulic conductivity of less than 10-6 cm/s is commonly used as barrier layer in waste landfill in Japan. But it is afraid that the bentonite mixed soil may have cracks when the base ground experiences a local subsidence. The authors conducted trap door tests of bentonite mixed soil under a surcharge pressure of 107.8kN/m2. The sizes of the compacted...