Design Recommendation for Stone Column Reinforced Soft Clay Deposit

Sudip Basack, Buddhima Indraratna, Cholachat Rujikiatkamjorn

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Ground Improvement/Remediation

ABSTRACT: Reducing long-term settlement of infrastructure and providing cost-effective foundations with sufficient load-bearing capacities are national priorities for infrastructure development in most countries. Among various methods of soft soil improvement, installing stone columns is one of the well established and effective techniques practised worldwide. The stone columns not only act as reinforcement to the surrounding soil, but also speed up the time-dependant dissipation of excess pore water pressure due to surcharge loading by shortening the drainage path. A novel numerical model has been developed and validated by the authors to analyse the response of stone column reinforced soft soil under embankment loading, adopting the free strain approach and considering arching, clogging and smear effects. Using the model, a design methodology associated with a series of charts and curves for various clogging and smear zone parameters has been suggested by the authors. Utilizing them, a typical design example for stone column reinforcement in a soft clay deposit has been presented.

RÉSUMÉ: Dans la majorité des pays, le développement des infrastructures constitue une priorité nationale pour construire sur des foun. En plus du renforcement du sol environnant, les colonnes ballastées accélèrent la dissipation des surpressions interstitielles, générées par le chargement, par la réduction de la distance de drainage. Une nouvelle methode numérique, mise au point et valt du remaniement. Avec ce modèle, les auteurs proposent une méthode de dimensionnement illustrée par des abaques et de courbes avec variation des paramètres de gile molle est

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