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Bearing capacity factor N c under ϕ=0 condition for piles in clays
Author(s) -
Khatri Vishwas N.,
Kumar Jyant
Publication year - 2008
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.763
Subject(s) - embedment , geotechnical engineering , cohesion (chemistry) , pile , limit analysis , bearing capacity , rotational symmetry , axial symmetry , factor of safety , mathematics , geology , upper and lower bounds , materials science , geometry , chemistry , mathematical analysis , organic chemistry
Bearing capacity factor N c for axially loaded piles in clays whose cohesion increases linearly with depth has been estimated numerically under undrained (ϕ=0) condition. The study follows the lower bound limit analysis in conjunction with finite elements and linear programming. A new formulation is proposed for solving an axisymmetric geotechnical stability problem. The variation of N c with embedment ratio is obtained for several rates of the increase of soil cohesion with depth; a special case is also examined when the pile base was placed on the stiff clay stratum overlaid by a soft clay layer. It was noticed that the magnitude of N c reaches almost a constant value for embedment ratio greater than unity. The roughness of the pile base and shaft affects marginally the magnitudes of N c . The results obtained from the present study are found to compare quite well with the different numerical solutions reported in the literature. Copyright © 2008 John Wiley & Sons, Ltd.