Lower-Bound Axisymmetric Formulation for Geomechanics Problems Using Nonlinear Optimization
Publication: International Journal of Geomechanics
Volume 15, Issue 5
Abstract
A lower-bound limit analysis formulation, by using two-dimensional finite elements, the three-dimensional Mohr-Coulomb yield criterion, and nonlinear optimization, has been given to deal with an axisymmetric geomechanics stability problem. The optimization was performed using an interior point method based on the logarithmic barrier function. The yield surface was smoothened (1) by removing the tip singularity at the apex of the pyramid in the meridian plane and (2) by eliminating the stress discontinuities at the corners of the yield hexagon in the . The circumferential stress () need not be assumed. With the proposed methodology, for a circular footing, the bearing-capacity factors , , and for different values of have been computed. For , the variation of with changes in the factor , which accounts for a linear increase of cohesion with depth, has been evaluated. Failure patterns for a few cases have also been drawn. The results from the formulation provide a good match with the solutions available from the literature.
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References
Abbo, A. J., Lyamin, A. V., Sloan, S. W., and Hambleton, J. P. (2011). “A C2 continuous approximation to the Mohr–Coulomb yield surface.” Int. J. Solids Struct., 48(21), 3001–3010.
Abbo, A. J., and Sloan, S. W. (1995). “A smooth hyperbolic approximation to the Mohr-Coulomb yield criterion.” Comput. Struct., 54(3), 427–441.
Bishop, A. W. (1966). “The strength of soils as engineering materials.” Géotechnique, 16(2), 91–130.
Bottero, A., Negre, R., Pastor, J., and Turgeman, S. (1980). “Finite element method and limit analysis theory for soil mechanics problem.” Comput. Methods Appl. Mech. Eng., 22(1), 131–149.
Khatri, V. N., and Kumar, J. (2009). “Bearing capacity factor under condition for piles in clays.” Int. J. Numer. Anal. Methods Geomech., 33(9), 1203–1225.
Krabbenhoft, K., and Damkilde, L. (2003). “A general non-linear optimization algorithm for lower bound limit analysis.” Int. J. Numer. Methods Eng., 56(2), 165–184.
Krabbenhoft, K., Lyamin, A. V., and Sloan, S. W. (2007). “Three-dimensional Mohr–Coulomb limit analysis using semidefinite programming.” Commun. Numer. Methods Eng., 24(11), 1107–1119.
Kumar, J., and Chakraborty, M. (2014). “Upper-bound axisymmetric limit analysis using the Mohr-Coulomb yield criterion, finite elements, and linear optimization.” J. Eng. Mech., 06014012.
Kumar, J., and Khatri, V. N. (2008). “Effect of footing roughness on lower bound values.” Int. J. Geomech., 176–187.
Kumar, J., and Khatri, V. N. (2011). “Bearing capacity factors of circular foundations for a general soil using lower bound finite elements limit analysis.” Int. J. Numer. Anal. Methods Geomech., 35(3), 393–405.
Kusakabe, O., Suzuki, H., and Nakase, A. (1986). “An upper bound calculation on bearing capacity of a circular footing on a non-homogeneous clay.” Soils Found., 26(3), 143–148.
Lesaja, G. (2009). “Introducing interior-point methods for introductory operations research courses and/or linear programming courses.” Open Oper. Res. J., 3, 1–12.
Lyamin, A. V., Salgado, R., Sloan, S. W., and Prezzi, M. (2007). “Two- and three-dimensional bearing capacity of footings in sand.” Géotechnique, 57(8), 647–662.
Lyamin, A. V., and Sloan, S. W. (2002). “Lower bound limit analysis using non-linear programming.” Int. J. Numer. Methods Eng., 55(5), 573–611.
Martin, C. M. (2004). “ABC—Analysis of bearing capacity.” 〈www.eng.ox.ac.uk/civil/people/cmm/software/abc〉 (Feb. 1, 2014).
Martin, C. M., and Makrodimopoulos, A. (2008). “Finite-element limit analysis of Mohr–Coulomb materials in 3D using semidefinite programming.” J. Eng. Mech., 339–347.
Nayak, G. C., and Zienkiewicz, O. C. (1972). “Convenient form of stress invariants for plasticity.” J. Struct. Div., 98(4), 949–954.
Pastor, J., and Turgeman, S. (1982). “Limit analysis in axisymmetrical problems: Numerical determination of complete statical solutions.” Int. J. Mech. Sci., 24(2), 95–117.
Salgado, R., Lyamin, A. V., Sloan, S. W., and Yu, H. S. (2004). “Two- and three-dimensional bearing capacity of foundations in clay.” Géotechnique, 54(5), 297–306.
Sloan, S. W. (1988). “Lower bound limit analysis using finite elements and linear programming.” Int. J. Numer. Anal. Methods Geomech., 12(1), 61–77.
Sloan, S. W., and Booker, J. R. (1986). “Removal of singularities in Tresca and Mohr–Coulomb yield functions.” Commun. Appl. Numer. Methods, 2(2), 173–179.
Sloan, S. W., and Kleeman, P. W. (1995). “Upper bound limit analysis using discontinuous velocity fields.” Comput. Methods Appl. Mech. Eng., 127(1–4), 293–314.
Ukritchon, B., Whittle, A. J., and Klangvijit, C. (2003). “Calculations of bearing capacity factor using numerical limit analyses.” J. Geotech. Geoenviron. Eng., 468–474.
Zienkiewicz, O. C., and Pande, G. N. (1977). “Some useful forms of isotropic yield surfaces for soil and rock mechanics.” Chapter 5, Finite elements in geomechanics, G. Gudehus, ed., Wiley, London, 179–190.
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© 2014 American Society of Civil Engineers.
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Received: Oct 15, 2013
Accepted: Sep 16, 2014
Published online: Oct 13, 2014
Published in print: Oct 1, 2015
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