Siphon method is proposed to consolidate the ultra-soft clay with horizontal geosynthetic drainage layers. A series of small-scale and large-scale siphon consolidation tests were carried out in the laboratory. The consolidation behavior response of ultra-soft clay to the change of the initial water contents and the magnitudes of the siphon suction was investigated. Test results show the higher the initial water contents of the sample and the magnitude of the suction at viscous state, the greater the drainage and drainage rate are. The availability and effectiveness of the horizontal slurry-geosynthetic drainage system by siphon method is experimentally verified.
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