Studying impact of reclamation technique on vibrocompaction performance

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Publication Title
Studying impact of reclamation technique on vibrocompaction performance

Abstract
The process of creating new lands from seas or riverbeds is an efficient and pragmatic approach responding to an increasingly growing global demand for commercial exchanges. The material is dredged and reclaimed via dumping, rainbowing or pumping ashore. In almost all cases, the newly reclaimed site can be enhanced using soil improvement (such as Rapid Impact Compaction, Dynamic Compaction or Vibrocompaction) and consolidation techniques (such as Prefabricated Vertical Drains with a preloading surcharge). In this paper, vibrocompaction data in a reclaimed silica-based clean sand, with 12% fines maximum, and less than 2% of 2μm clay particles, has been analysed for a jobsite located in South America. On this project, unexpected difficulties were encountered. Correlating the needle’s amperage with 150 pre and post-CPTs (Cone Penetration Tests), the descending and ascending phases of vibrologs have been split and studied independently. The influence of grid size and the number of passes has been investigated. The resulting in-depth data analysis identifies clear differences in soil improvement performances depending on the reclamation technique. The article also includes an analysis of the ageing effect after a 100-days resting period by means of CPTs.
Authors
A. Debaize; T. Pille; K. Dedecker

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

D - Current and new construction methods

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