SUMMARYBy using the lower bound limit analysis in conjunction with finite elements and linear programming, the bearing capacity factors due to cohesion, surcharge and unit weight, respectively, have been computed for a circular footing with different values of . The recent axisymmetric formulation proposed by the authors under = 0 condition, which is based on the concept that the magnitude of the hoop stress ( ) remains closer to the least compressive normal stress ( 3 ), is extended for a general c-soil. The computational results are found to compare quite well with the available numerical results from literature. It is expected that the study will be useful for solving various axisymmetric geotechnical stability problems.

SUMMARYBearing capacity factor N c for axially loaded piles in clays whose cohesion increases linearly with depth has been estimated numerically under undrained ( = 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.

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