ISSN 2319-5347, ISI Impact Factor: 0.763

VOLUME 05 NO. 04 OCTOBER 2016:

Title:       Evaluation of the Response of Rajshahi City Protection Embankment, Bangladesh under Variation of Water-Level by LEM
Authors:    Md. Mahmud Sazzad, Faysal Ibna Rahman, Md. Samdani Azad
Abstract:  In the field of geotechnical engineering, to evaluate the stability of slope is a major concern. Stability of waterfront structures such as embankments, dams and natural riverside slopes are hampered due to the variation of water level. Due to the fluid nature, water can easily move into the soil pores. This reduces the effective stress and soil strength that can have devastating effects on the stability of earth slopes. The aim of this paper is to evaluate the response of the variation of water level on the stability of slope of existing Rajshahi city protection embankment by using limit element method (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 for LEM based studies. Soli properties are obtained from laboratory test. The geometric models are incorporated in the GEO5, a tool for analyzing for LEM based slope stability problems. The material properties are assigned and the numerical analysis are carried out by using GEO5. The level of water is varied and the numerical results are computed considering three types of phreatic angle. From the study, it is noted that the variation of water level effects the factor of safety of slopes. The factor of safety decreases with the increase of the water level up to the critical point and then the factor of safety increases with the increase of the water level. Factor of safety varies 4.15 to 1.72 for incorporating model and factor safety of critical pool level indicates lowest factor of safety which occurs 35% to 45% of the highest water level in the slope range.

Keywords: Embankment, LEM, Factor of safety, Slope stability, Water-level
Pages:       129-136

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