A Numerical Study of Bearing Capacity Coefficients of Soil Beneath Foundation under Earthquake Load

 

Pezhman Fazel

Department of Civil Engineering, Islamic Azad University – Shahrekord Branch, Shahrekord, Iran
e-mail: p_fazeli@iaushk.ac.ir

Soheil Ghareh

Department of Civil Engineering, Payame Noor University, P.O. Box 19395-4697, Tehran, Iran
e-mail: ghareh_soheil@pnu.ac.ir

ABSTRACT

Evaluation of soil bearing capacity coefficients of has been the focus of a significant amount of studies by various researchers. In all conducted studies and analyses, by considering different forms of earthquake load with pseudo-static performance, different results have been obtained. In this research, evaluation of soil bearing capacity coefficients under earthquake load has been carried out using finite elements software Plaxis and the obtained results have been compared with those from other published studies. Moreover, the effect of the inertia of the underpinning soil on the soil bearing capacity coefficients was modeled in the pseudo- static mode and the results indicated that bearing capacity coefficients obtained from pseudo-static gave good agreement with other methods. However, comparison of these two results revealed that the results obtained from numerical modeling are more conservative and are on the safety side. Finally, since the pseudo –static load is not characterized as an appropriate alternative for the earthquake load; the effect of underpinning soil on the manner of transferring the earthquake waves until reaching the foundation bed has been also investigated. Evaluation of soil bearing capacity coefficients of has been the focus of a significant amount of studies by various researchers. In all conducted studies and analyses, by considering different forms of earthquake load with pseudo-static performance, different results have been obtained. In this research, evaluation of soil bearing capacity coefficients under earthquake load has been carried out using finite elements software Plaxis and the obtained results have been compared with those from other published studies.

Keywords: Numerical modeling, Bearing capacity, Earthquake load, Plaxis, Pseudo–static load

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