Abstract

Dynamic replacement (DR) and dynamic compaction (DC) have been used effectively as ground improvement techniques to reduce settlement, increase bearing capacity and mitigate liquefaction. A case study of 11 million m2 of ground improvement work, using DC and DR, is presented to define lessons that can be learned. Before the ground improvement work, an extensive soil field testing campaign was completed, which revealed the heterogeneity of the soil strata: the type of soil encountered, its stiffness and the depth of the weak soil to be improved. A comprehensive analysis of the soil testing allowed the identification of the appropriate ground improvement techniques to meet the project schedule and achievement of the required bearing capacity and the permitted settlement. The results of the ground improvement work are discussed in this paper. Also, the lessons learned from the ground improvement work are presented.

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