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Laboratory study on methods to improve dewatering efficiency of geotextile tube filled by clayey silt slurry

Geotextile tubes have been widely used to construct dike in the coastal and estuary area of China. However, the dewatering velocity of geotextile tube filled by clayey silt slurry is so slow that can not satisfy the requirement of limit construction period. Several laboratory model tests were conducted to investigate the dewatering efficiency of different filling and discharging methods. The pore water pressure, water content, reserved particle gradation and dry density monitored of the filled soil in different position are tested and analyzed. Through the tested results, the comprehensive dewatering velocities of different construction methods were comparatively evaluated. The model test results showed that the dewatering method which combines actively discharging muddy water with alternately filling and discharging methods is more effective.