| The technology for regeneration of geotechnical materials from dredged silt is receiving increasing attention around the world. One of techniques for converting the dredged silt into usable resources is the lightweight treated soil (LWTS) technique. The technology is to regenerate new geotechnical materials by mixing dredged silt of high water content with solidification materials and waste expanded polystyrene (WEPS). This geotechnical material has promising future due to their performance advantages such as light weight, high strength, self-standing, shorter project execution time, re-utilization of surplus soils, and environmental friendliness. However, much effort should be devoted to the area since the research is still in its infancy. In this dissertation, the physical and mechanical properties of this lightweight soil are studied as follows:1. The preparation method of the lightweight mixture specimen is presented. It is proved this technology is feasible.2. The density is found to be mainly affected by the additive rate of WEPS beads according to density experiment.3. The strength is dominated by additives rates of cement and WEPS, particle size of WEPS and curing period according to density experiment.4. It is stress-strain demonstrates the properties of non-linear and harden, volume change is always shearing shrinkage. The pore water pressure characterized by two aspects, one is water pore pressure decreases after reaching the peak with the strain increasing, the other is water pore pressure increases with strain increasing.5. Two types of Mohr-Coulomb failure envelope of the lightweight mixture specimen were identified namely the folding line and straight line.6. Based on the experiments, Duncan-Chang's parameters which play an important role for the design of the WEPS were extracted.7. The mechanical properties are found to be affected by the type of EPS beads.
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