ISSN 2319-5347, ISI Impact Factor: 0.763

VOLUME 05 NO. 02 APRIL 2016:

Title:         Evaluating the response of Rajshahi city protection embankment, Bangladesh under seismic load
Authors:    Md. Mahmud Sazzad, Faysal Ibna Rahman, Md. Abdullah Al Mamun
Abstract:  To evaluate the stability of slope is a major concern in the field of geotechnical engineering. Forsimplicity and effectiveness, usually two-dimensional analysis on limit equilibrium methods (LEMs) areimplement in this field. Stability of waterfront structures such as embankments, dams and natural riverside slopes are hampered due to the seismic load. The aim of this paper is to evaluate the response of the seismic load on the stability of slope of the existing Rajshahi city protection embankment by using LEM. Bishop, Spencer, Fellenious, Janbu and Morgenstern-Price methods are used for LEM. For this study, three locations are selected from Rajshahi city protection embankment and numerical models are prepared following the in-situ dimensions of slopes for LEM based studies. Soli properties are obtained from the laboratory tests. The geometric models of the cross-section of the selected locations are prepared with the help of GEO5, a tool for analyzing the LEM based slope stability problems. The material properties are assigned and the numerical analysis are carried out by using GEO5. From the analysis, it is noted that the factor of safety of slopes decreases with the increase of horizontal seismic coefficient, Kh . Horizontal seismic coefficient affects the stability of slope severely than the vertical seismic coefficient, Kv . From the analysis, it is also observed that the factor of safety of theslope of the existing Rajshahi city protection embankment is critically stable up to the value of Kh =0.25 and Kv =0.125(equivalent to 10 for Modified Mercalli intensity scale and 7-8 for Richter scale) at present under the seismic load.

Keywords:  Slope stability, Seismic coefficients, Factor of safety, LEM, Embankment.
Pages:         46-51

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