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Bearing capacity of under-reamed piles in clay using lower bound finite element limit analysis
In this study, bearing capacity of under-reamed piles in non-homogeneous clay is estimated numerically. A detailed parametric study is carried out for different length to shaft diameter ratio (Lu/D), bulb position (hb/Du), under-ream angle (β) and constant m indicating the increase of undrained cohesion, number of bulbs (nb), bulb spacing (s) and pile–soil adhesion factor (αs). The bearing capacity of the under-reamed pile is presented through design charts and expressed by a dimensionless factor Ncu. Ncu increases significantly with increases in nb, Lu/D and m and moderately with increases in β and αs. For m > 0, Ncu decreases moderately with the increase in hb/Du. For two bulbs, m > 0, the optimum bulb spacing is found at 1.25–1.75Du. For one bulb, Ncu increases in the range of 67.52–162.84% than the pile without bulb. For two bulbs, Ncu increases in the range of 129.41–250.40% than the pile without bulb.
Bearing capacity of under-reamed piles in clay using lower bound finite element limit analysis
In this study, bearing capacity of under-reamed piles in non-homogeneous clay is estimated numerically. A detailed parametric study is carried out for different length to shaft diameter ratio (Lu/D), bulb position (hb/Du), under-ream angle (β) and constant m indicating the increase of undrained cohesion, number of bulbs (nb), bulb spacing (s) and pile–soil adhesion factor (αs). The bearing capacity of the under-reamed pile is presented through design charts and expressed by a dimensionless factor Ncu. Ncu increases significantly with increases in nb, Lu/D and m and moderately with increases in β and αs. For m > 0, Ncu decreases moderately with the increase in hb/Du. For two bulbs, m > 0, the optimum bulb spacing is found at 1.25–1.75Du. For one bulb, Ncu increases in the range of 67.52–162.84% than the pile without bulb. For two bulbs, Ncu increases in the range of 129.41–250.40% than the pile without bulb.
Bearing capacity of under-reamed piles in clay using lower bound finite element limit analysis
Majumder, Mantu (author) / Chakraborty, Debarghya (author)
International Journal of Geotechnical Engineering ; 16 ; 1104-1115
2022-10-21
12 pages
Article (Journal)
Electronic Resource
Unknown
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