Abstract: This paper presents a settlement estimation of the soil improvement ground of thick fills by high energy dynamic replacement using the summation of sublayered settlement analysis method. The actual settlements of the improved ground at the perimeters of the tanks were monitored during and after construction considering the complication of the improved soil layers and limitation of the existing theoretical settlement estimation methods. After comparing the monitored and estimated settlement values, the following conclusions can be obtained: The high energy dynamic compaction replacement method can be used in improving the thick recent random fill site. Both estimated and monitored settlement values indicated that the total, differential settlements and tilting of the structure can meet the code requirements. The rate of settlement after the construction reduces with time and the settlement approaches to stable within six months after the construction.

Key words: Summation of Sub-Layered Settlement Analysis Method, High Energy Dynamic Compaction Replacement, Thick Fills, Settlement Monitoring