Comparative Performance Evaluation of Ordinary and Encased Granular Columns Subjected to Lateral Shear

Geosynthetic encapsulation of granular columns has proven to be an effective ground improvement solution. The behavior of this innovative eco-composite under vertical loading is well documented in the literature. Granular columns, however, also endure significant lateral shear stress, particularly w...

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Bibliographic Details
Published in:Transportation infrastructure geotechnology 2024-06, Vol.11 (3), p.956-977
Main Authors: Mohammad, Sabreena, Mir, Bashir Ahmed
Format: Article
Language:English
Subjects:
Building Materials
Columns (structural)
Deformation
Earthquakes
Embankments
Encapsulation
Engineering
Failure mechanisms
Foundations
Geoengineering
Geosynthetics
Geotechnical Engineering & Applied Earth Sciences
Hydraulics
Performance evaluation
Redevelopment
Retaining walls
Seismic activity
Shear planes
Shear strength
Shear stress
Shear tests
Soil strength
Technical Paper
Vertical loads
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Summary:Geosynthetic encapsulation of granular columns has proven to be an effective ground improvement solution. The behavior of this innovative eco-composite under vertical loading is well documented in the literature. Granular columns, however, also endure significant lateral shear stress, particularly when located at the toes of embankments or retaining walls and due to stresses brought on by earthquakes. This study experimentally investigated lateral shear loading on ordinary and granular columns encapsulated by geosynthetic material. The experimental tests were performed using the large-scale direct shear testing machine. Based on the findings of this experimental investigation, extra confining forces provided to columns by geosynthetic encapsulation led to the development of apparent cohesion within the column, increasing the lateral shear resistance of the composite. The effect of critical factors like the morphology of column infill material and column configurations on the shear strength parameters of soil-column composites has been highlighted. Also, it was observed that ordinary granular columns undergo complete shear failure along the shear plane; however, for the geosynthetic-encased columns, the failure mechanism was bending rather than complete shear failure, preventing catastrophic failure.
ISSN:2196-7202
2196-7210
DOI:10.1007/s40515-023-00310-5