Design of Ground Improvement using Continuous Flight Auger Columns for Railway Embankment

Jiping Pan, Muliadi Merry, Andrea Faulkner, Tao Li

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: The upgrade of the Glenfield Junction, in south-west Sydney, Australia, involves the construction of new viaducts and associated approach embankments of up to 7.6m height over soft to firm alluvium deposits. It is a challenge to construct new tracks with existing live tracks nearby within tight timeline satisfying both stringent railway geometrical tolerance and performance. Ground treatment by semi-rigid inclusion technique involving the installation of Continuous Flight Auger (CFA) columns, in conjunction with Load Transfer Mat was adopted. This paper presents the analytical and numerical finite element analyses adopted in assessing the behaviour of the embankment prior and after ground treatment works. It emphasizes on the challenges in predicting the settlements of the embankment and the various numerical modelling approaches to assess the performance of ground treatment by CFA columns both longitudinally and transversely. It is demonstrated that the CFA columns can be treated as vertical aving equivalent improved strength and deformation properties.

RÉSUMÉ: La mise à niveau de Glenfield Junction dans le sud-ouest de Sydney, Australie, implique la construction sur un sol composé ance variable de mou à ferme, de nouveaux viaducs et de remblais d'approche de 7.6m de hauteur. Il est délicat de construire de nouvelles voies autour et dans la très proche proximité de voies ferrées en opération en respectant á la fois les règles strictes de tolérance géométrique et des objectifs de performance. Le traitement du sol par technique d'inclusion semi-rigide impliquant l'installation de colonnes CFA avec un tapis de transfert de chargement a été adopté comme la méthode de choix. Cet article déléments finis sur le comportement des remblais avant et après les tnumériques mesurant à la fois longitudinalement et transversalement.

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