Upper bound limit analysis of slope stability using rigid finite elements and nonlinear programming

In this paper, the development and application of a new upper bound limit method for two- and three-dimensional (2D and 3D) slope stability problems is presented. Rigid finite elements are used to construct a kinematically admissible velocity field. Kinematically admissible velocity discontinuities are permitted to occur at all inter-element boundaries. The proposed method formulates the slope stability problem as an optimization problem based on the upper bound theorem. The objective function for determination of the minimum value of the factor of safety has a number of unknowns that are subject to a set of linear and nonlinear equality constraints as well as linear inequality constraints. The objective function and constrain equations are derived from an energy-work balance equation, the Mohr-Coulomb failure (yield) criterion, an associated flow rule, and a number of boundary conditions. The objective function with constraints leads to a standard nonlinear programming problem, which can be solved by a sequential quadratic algorithm. A computer program has been developed for finding the factor of safety of a slope, which makes the present method simple to implement. Four typical 2D and 3D slope stability problems are selected from the literature and are analysed using the present method. The results of the present limit analysis are compared with those produced by other approaches reported in the literature.published_or_final_versio

求解弹性地基上四边自由板的功的互等定理法

2001-2002 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Settlement prediction methods considering creep

2004-2005 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Analytical study for double-layer geosynthetic reinforced load transfer platform on column improved soft soil

© 2017 The objective of this study is to propose a reasonably accurate mechanical model for double-layer geosynthetic reinforced load transfer platform (LTP) on column reinforced soft soil which can be used by practicing engineers. The developed model is very useful to study the behaviour of LTP resting on soft soil improved with conventional columns such as concrete columns, piles, and deep soil mixing columns. The negligible tensile strength of granular material in LTP, bending and shear deformations of LTP, compressibility and shearing of soft soil have been incorporated in the model. Furthermore, the results from the proposed model simulating the soft soil as Kerr foundation model are compared to the corresponding solutions when the soft soil is idealised by Winkler and Pasternak foundation models. It is observed from the comparison that the presented model can be used as a tool for a better prediction of the LTP behaviour with multi layers of geosynthetics, in comparison with the situation that soft soil is modelled by Winkler and Pasternak foundations. Furthermore, parametric studies show that as the column spacing increases, the maximum deflection of LTP and normalised tension in the geosynthetics also increase. Whereas, the maximum deflection of LTP and normalised tension in the geosynthetics decrease with increasing LTP thickness, stiffness of subsoil, and stiffness of geosynthetic reinforcement. In addition, it is observed that the use of one stronger geosynthetic layer (e.g. 1 × 2000 kN/m) with the equivalent stiffness of two geosynthetic layers (e.g. 2 × 1000 kN/m) does not result in the same settlement of LTP and the tension of the geosynthetic reinforcement when compared to two weaker geosynthetic layers

Experimental study on settling consolidation behavior of Hong Kong marine deposits

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Shear behavior of an unsaturated soil-steel interface from direct shear tests

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New mixed boundary true triaxial loading device for testing study on 3-D stress-strain-strength behaviour of geomaterials

2009-2010 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Study on bearing performance of friction pile foundation in complicated soil-layers

2003-2004 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Study on dynamic properties and liquefication of silt

2001-2002 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Finite layer analysis of three-dimensional biot consolidation of homogeneous soils

2003-2004 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe