Undrained lower bound solutions for end bearing capacity of shallow circular piles in non-homogeneous and anisotropic clays |
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| Authors: | Boonchai Ukritchon Suraparb Keawsawasvong |
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| Institution: | 1. Centre of Excellence in Geotechnical and Geoenvironmental Engineering, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330 Thailand;2. Department of Civil Engineering, Thammasat School of Engineering, Thammasat University, Pathumthani, 12120 Thailand |
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| Abstract: | The undrained bearing capacity of shallow circular piles in non-homogeneous and anisotropic clay is investigated by the lower bound (LB) finite element limit analysis (FELA) under two-dimensional (2D) axisymmetric condition using second-order cone programming, and the new solution of the problem is presented. Modified from the isotropic von Mises yield criterion, a cross-anisotropic undrained strength criterion of clays under the axisymmetric state of stress requiring three input shear strengths in triaxial compression, direct simple shear, and triaxial extension is employed in the 2D axisymmetric LB FELA. Parametric studies on the effects of pile embedment ratio, dimensionless strength gradient, anisotropic strength ratio, and pile roughness are investigated extensively, while the predicted failure mechanisms associated with these parameters are discussed and compared. Numerical results of undrained end bearing capacity of shallow circular piles are summarized in the form of design tables that are useful for design practice and represent a new contribution to the field of pile capacity considering the combined effects of undrained strength non-homogeneity and anisotropy. |
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| Keywords: | anisotropic strength circular piles finite element limit analysis lower bound pile capacity |
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