TEST RESEARCH ON PORE WATER PRESSURE OF DREDGER FILL CONSOLIDATION WITH VACUUM PRELOADING

Pore water pressures changing often reflect the degree of soil consolidation which using vacuum preloading method to deal with dredger fill.Drainage body was determined by measure drainage system under different pore water pressure on 6 test chambers.The results show that the soil pore water pressure drop in 0.4m was better than 0.8m,different drainage body had its own soil pore water.And the pore water pressure in the distance of 10cm to drainage body was half of the pore water pressure in drainage body.Membrane drain system was the best for drainage and then B-type drain system was better than sand drain system.In addition,in the dredger fill,the effective distance between drain pipes was between 0.4m and 0.8m.Moreover,membranes had large effective distance of drainage body,while B-types was the second and sand wells much smaller than the former two.