Abstract:

Hydraulic fill had become one of main method to make up for the deficiency of construction land in the coastal regions. In order to obtained the better consolidation effect of dredger fill in a relatively short period of time, considering dredger fill’s special engineering geological nature and periodic strength growth in the strengthening process, the idea about reinforcement at the same time of blowing has been proposed. Indoor simulation experiment carried out under the guidance of the idea. Test results showed that different stages of dredger fill reinforcement strength showed growth zoning. Soil strength increased rapidly when the distance between the soil and vertical drain body was less than 25 cm. With the reinforcement of time extension the strength of reinforced soil increased in the overall. When the vacuum load lasted one month, some of reinforced soil’s bearing capacity had been reached 80 kPa. Strength of growth was closely related to the size of the external load, the length of the infiltration path, size of additional stress. Step-by-step reinforcement method inhibited the formation of clay ring to some extent, Shorten the vacuum loading time and save time. Step-by-step reinforcement method is advantageous for dredger fill’s consolidation a reinforced fill.

Key words: dredger soil, quick consolidation, simulation, test