Abstract
Compaction grouting has become a popular method for site improvement around the world. However, in saturated soft clays, the treatment often induces higher excess pore water pressure and limits the efficiency of the improvement. To take advantage of the prefabricated vertical drain (PVD) and compaction grouting, a radial ground improvement technology (RGIT) was proposed for treatment of a site that was located on a thick saturated soft estuarine deposit. The treatment turns the compaction grouting into a radial accelerating consolidation process that increases improvement efficiency significantly. This paper describes a phase I study of RGIT by using finite element analysis to examine the field performance and develop design criteria for the construction. Based on the research findings, RGIT appears to be practical for soft clay improvement and demonstrated advantages over conventional compaction grouting. Confidence in what was achieved allowed RGIT to be used for the proposed site.
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