RESEARCH ON SETTLEMENT OF DREDGER FILL CONSOLIDATION WITH VACUUM PRELOADING TEST

Drainage consolidation is the best way to deal with large area of soft ground.But the effects of consolidation are adverse when the dredger fill is soft clay which initial moisture content is above 120%.In order to improve the efficiency and to optimize the progress of dredger fill consolidation,an orthogonal test was done.There were 4 test chambers installed in lab,including 2 kinds of drain pipes and 2 distances between drain pipes.Hyperbola model,exponential model and the amendments index model were used to predict the amount of the settlement.Comparison 4 kinds of tests,the largest surface settlement of dredger fill were found when using the domestic B-type drain pipe with spacing 40cm.And its settlement has the best modified exponential model.In this case the shortest time-consuming with 90% degree of consolidation was predicted for reference settlement.