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Failure Heights and Failure Modes of Eight Column-Supported Embankments via 3D Numerical Analyses
This paper presents the failure heights and failure modes of eight column-supported embankment (CSE) scenarios as determined from three-dimensional finite difference analyses. CSEs were supported by unreinforced concrete columns with properties representative of vibro-concrete. Scenarios consisted of a base case using typical column design and a layer of geosynthetic in the load transfer platform, single-parameter variations using base case conditions, and multiparameter variations using base case conditions in which the simultaneous change in multiple parameters resulted in a significantly worse or better condition than the base case. Selected parameters are important for design and site characterization (i.e., column spacing and diameter, geosynthetic tensile capacity, and clay’s undrained shear strength). At different embankment heights, equilibrium was computed for an undrained state in which excess pore water pressures have developed in the clay and for a long-term state in which the excess pore water pressures have fully dissipated. The failure height was defined as the embankment height at which deformations continually increased in either the undrained or dissipated condition. Columns and geosynthetic reinforcement were each assigned a failure criterion. Key findings are as follows: (1) CSE stability is most critical at undrained end-of-construction; (2) embankment failure height is significantly influenced by the clay’s undrained shear strength; (3) two failure modes were found, and both involve complex soil column interactions and flexural tensile failure of the unreinforced concrete columns; and (4) if a geosynthetic is included in design, then collapse occurs in the undrained condition after geosynthetic tensile failure. Implications for practice are discussed.
Failure Heights and Failure Modes of Eight Column-Supported Embankments via 3D Numerical Analyses
This paper presents the failure heights and failure modes of eight column-supported embankment (CSE) scenarios as determined from three-dimensional finite difference analyses. CSEs were supported by unreinforced concrete columns with properties representative of vibro-concrete. Scenarios consisted of a base case using typical column design and a layer of geosynthetic in the load transfer platform, single-parameter variations using base case conditions, and multiparameter variations using base case conditions in which the simultaneous change in multiple parameters resulted in a significantly worse or better condition than the base case. Selected parameters are important for design and site characterization (i.e., column spacing and diameter, geosynthetic tensile capacity, and clay’s undrained shear strength). At different embankment heights, equilibrium was computed for an undrained state in which excess pore water pressures have developed in the clay and for a long-term state in which the excess pore water pressures have fully dissipated. The failure height was defined as the embankment height at which deformations continually increased in either the undrained or dissipated condition. Columns and geosynthetic reinforcement were each assigned a failure criterion. Key findings are as follows: (1) CSE stability is most critical at undrained end-of-construction; (2) embankment failure height is significantly influenced by the clay’s undrained shear strength; (3) two failure modes were found, and both involve complex soil column interactions and flexural tensile failure of the unreinforced concrete columns; and (4) if a geosynthetic is included in design, then collapse occurs in the undrained condition after geosynthetic tensile failure. Implications for practice are discussed.
Failure Heights and Failure Modes of Eight Column-Supported Embankments via 3D Numerical Analyses
Huang, Zhanyu (author) / Ziotopoulou, Katerina (author) / Filz, George M. (author)
International Foundations Congress and Equipment Expo 2021 ; 2021 ; Dallas, Texas
IFCEE 2021 ; 227-236
2021-05-06
Conference paper
Electronic Resource
English
Failure Heights and Failure Modes of Eight Column-Supported Embankments via 3D Numerical Analyses
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