A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Peak punch-through capacity of spudcan in sand with interbedded clay: numerical and analytical modelling
The presence of a thin soft clay layer inside a bed of sand may significantly reduce the bearing capacity of the sand layer, imposing a risk of punch-through failure. In this paper, finite element (FE) simulations are reported using a hardening soil (HS) model for sand. The FE model has been verified against centrifuge tests involving loose and dense sand layers overlying clay soil. The effects of sand stiffness, foundation roughness, sand friction angle, undrained clay strength, clay strength nonhomogeneity, and sand and clay layer geometries on the foundation peak capacities have been studied. Punch-through failure is initiated with an inclined sand plug being sheared and pushed into the underlying soft clay. During punch-through, the clay layer fails due to significant radial squeezing. Existing analytical models do not capture the combined failure mechanism of sand shearing and clay radial squeezing. A new analytical model is developed to estimate the peak punch-through capacity of a spudcan in sand with an interbedded clay layer, showing improved performance over the current industry guidelines.
Peak punch-through capacity of spudcan in sand with interbedded clay: numerical and analytical modelling
The presence of a thin soft clay layer inside a bed of sand may significantly reduce the bearing capacity of the sand layer, imposing a risk of punch-through failure. In this paper, finite element (FE) simulations are reported using a hardening soil (HS) model for sand. The FE model has been verified against centrifuge tests involving loose and dense sand layers overlying clay soil. The effects of sand stiffness, foundation roughness, sand friction angle, undrained clay strength, clay strength nonhomogeneity, and sand and clay layer geometries on the foundation peak capacities have been studied. Punch-through failure is initiated with an inclined sand plug being sheared and pushed into the underlying soft clay. During punch-through, the clay layer fails due to significant radial squeezing. Existing analytical models do not capture the combined failure mechanism of sand shearing and clay radial squeezing. A new analytical model is developed to estimate the peak punch-through capacity of a spudcan in sand with an interbedded clay layer, showing improved performance over the current industry guidelines.
Peak punch-through capacity of spudcan in sand with interbedded clay: numerical and analytical modelling
Hu, Yuxia (author) / Ullah, Shah Neyamat
2017
Article (Journal)
English
Clays , essais par centrifugation , Soil , Mathematical models , Economic conditions , finite element modelling , Clay , Friction , Computer simulation , Bearing capacity , Risks , Analytical models , échec par perforation , sable avec argile interstratifiée , Centrifuges , Stiffness , modélisation par éléments finis , Clay soils , Hardening , Capacity , capacité portante , Failure , Soils , Finite element method , Iron , Roughness , Soil layers , Soft clay , sand with interbedded clay , Economic indicators , Mathematical analysis , Economic forecasts , Strength , peak bearing capacity , Layers , Sandy soils , spudcan , Shearing , centrifuge testing , Statistical data , punch-through failure , Modelling , Compressing , Sand
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