Comparative analysis of soft soil consolidation time due to improvement using Prefabricated Vertical Drain

Abstract

Construction built on soft soils will cause several geotechnical problems, one of which is a consolidation settlement that lasts for a long time due to the low permeability of soft soils. This study aims to compare the time of soft soil consolidation settlement before and after soil improvement using Prefabricated Vertical Drain (PVD). PVD is a plastic sheet made from a composite, consisting of a drain core and filter jacket with a function to accelerate the process of pore water discharge to the ground surface by shortening the horizontal waterway. The method used using analysis, where the time of consolidation settlement reaches a degree of consolidation of 90%. The PVD pattern used is a triangle pattern and a rectangular pattern with a distance variation of 0.6 m; 0.7 m; 0.8 m; 0.9 m; 1.0 m; 1.1 m; and 1.2 m. The results obtained, based on the PVD pattern, the time of consolidation settlement is faster if using a triangle pattern compared to the rectangular pattern. Whereas, based on distance, the smaller the distance between PVDs, the faster the time of consolidation will decrease.