Bangladesh Society for Geotechnocal Engineering

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Explicit Integration of Subloading tij Constitutive Model in FEM Analysis

Author(s): Hossain M. Shahin, Teruo Nakai, Dorival Pedroso

Keyword(s): finite element method, constitutive equation of soil, explicit integration, plasticity, bearing capacity, tunnel excavation

Abstract: In this paper, three explicit integration schemes of subloading tij model, an elastoplastic constitutive model for soils, are described. The constitutive model can properly describes- influence of intermediate principal stress on the deformation and strength of soils, dependence of the direction of plastic flow on the stress paths, influence of density and/or confining pressure on the deformation and strength of soils. Three explicit integration schemes are adopted, namely- Forward Euler (FE), Modified Euler (ME) and Runge-Kutta-Dormand-Prince (RKDP) integration schemes The performance of the schemes has been investigated considering two different problems- bearing capacity of flat foundation and shallow tunnel excavation. For each integration scheme a series of analyses have been carried out varying the loading steps (the size of load increment). It is found that t he result of the FE scheme is the most inaccurate among the three different schemes for the same loading steps. The FE scheme requires higher computation time for achieving smaller error. In RKDP scheme the derivatives are evaluated in six different positions, hence it requires higher computation time than that for ME scheme. The ME scheme is found the most efficient for the two different geotechnical problems.

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Prof A. M. M. Safiullah

Warm greetings to BSGE members, well wishers and patrons. Thanks for your continued support in BSGE activities all through the years since formation of the society in 1989. I hope BSGE activities will be facilitated with this updated web page. Let's make it an effective means for communication and information sharing among our fellow members and geotechnical professionals/organizations at home and around the world. With the increase in infrastructure development in Bangladesh we have to face new geotechnical challenges in the coming years. I would request the civil engineers, academicians, contractors, geotechnical firms and all others relevant to the geotechnical engineering profession in the country for increased interaction through BSGE to develop and maintain standards so that we can face these challenges in a professional way

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Explicit Integration of Subloading tij Constitutive Model in FEM Analysis

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Prof A. M. M. Safiullah

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