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Slip-line analyses of geosynthetic-reinforced strip footings
Theoretical analyses of the plastic failure region and the ultimate bearing capacity of reinforced soils under strip footings are presented in this paper. The analysis is based on the failure criteria for homogenized reinforced soils and the application of the slipline method (the method of characteristics). Two ideal footing bases are considered: a perfectly smooth base and a perfectly rough base. Influence of geosynthetic reinforcement properties (tensile strength, deployment orientation) and soil strength (friction angle and cohesion) on the bearing capacity of reinforced footings and the plastic failure region are investigated. Three design examples of strip footings are analyzed: an unreinforced footing with significantly deep excavation; a geosynthetic reinforced footing back filled with the same subgrade soil, and a geosynthetic reinforced footing back filled with better quality soil. The bearing capacity and stress characteristics field are presented. This analysis can lead to a better understanding of the plastic failure region of reinforced footings and more rigorous design methods. The deformation properties of the first prototype PLPS reinforced soil structure and three full-scale models of PLPS embankment were compared. It was confirmed that the compaction is essential to make the backfill stiff. It was found, however, that even a very well compacted backfill could exhibit very large irreversible deformation by static (i.e. monotonic and creep) and transient cyclic loading. To restrain this irreversible deformation, it is effective to preload the backfill sufficiently and to unload some part of it, and to keep high prestress in the backfill.
Slip-line analyses of geosynthetic-reinforced strip footings
Theoretical analyses of the plastic failure region and the ultimate bearing capacity of reinforced soils under strip footings are presented in this paper. The analysis is based on the failure criteria for homogenized reinforced soils and the application of the slipline method (the method of characteristics). Two ideal footing bases are considered: a perfectly smooth base and a perfectly rough base. Influence of geosynthetic reinforcement properties (tensile strength, deployment orientation) and soil strength (friction angle and cohesion) on the bearing capacity of reinforced footings and the plastic failure region are investigated. Three design examples of strip footings are analyzed: an unreinforced footing with significantly deep excavation; a geosynthetic reinforced footing back filled with the same subgrade soil, and a geosynthetic reinforced footing back filled with better quality soil. The bearing capacity and stress characteristics field are presented. This analysis can lead to a better understanding of the plastic failure region of reinforced footings and more rigorous design methods. The deformation properties of the first prototype PLPS reinforced soil structure and three full-scale models of PLPS embankment were compared. It was confirmed that the compaction is essential to make the backfill stiff. It was found, however, that even a very well compacted backfill could exhibit very large irreversible deformation by static (i.e. monotonic and creep) and transient cyclic loading. To restrain this irreversible deformation, it is effective to preload the backfill sufficiently and to unload some part of it, and to keep high prestress in the backfill.
Slip-line analyses of geosynthetic-reinforced strip footings
Gleitlinienanalysen von geosynthetisch verstärkten Bankettstreifen
Zhao, Aigen (author)
1998
13 Seiten, 12 Bilder, 11 Quellen
Conference paper
English
Slip-Line Analyses of Geosynthetic-Reinforced Strip Footings
| British Library Conference Proceedings | 1998
Analysis of Settlement Profiles of Shallow Strip Footings Resting on Geosynthetic-Reinforced Sands
| Springer Verlag | 2024