Improving soft soil using high vacuum densification method in the laboratory

Abstract

This study presents a controlled laboratory evaluation of the high vacuum densification method (HVDM) for improving extremely soft soil using a 1 g physical model. Following several trials on the physical model, the experiment was carried out using samples obtained from the field site, where HVDM was applied to improve the soil properties. The successful application of HVDM within the physical model resulted in achieving 94% relative compaction, accompanied by significant enhancements in soil strength: specifically, a 37% increase in unconfined compressive strength and a 38% rise in triaxial deviator strength, as well as a significant improvement in cohesion and angle of internal friction relative to untreated conditions. Also, the experimental observations, including the pore pressure response, settlement behavior, and visual evidence, all indicate a significant enhancement in soil stiffness following HVDM treatment, accompanied by rapid consolidation and increased density. The application of HVDM enables the achievement of the desired soil stiffness within the shortest possible timeframe.