ICASGE'23
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EVALUATE THE EFFECT OF WAVE PRESSURE ON THE STABILITY OF SANDY MARINE SLOPES
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Volume Title: ICASGE2023
Authors
1Civil, Faculty of Engineering, Alexandria University, Alexandria, Egypt
2Civil department, faculty of Engineering, Alexandria university, Alexandria, Egypt
3Cicil department, Faculty of Engineering, Alexandria University, Alexandria, Egypt
Abstract
Marine slopes are very important for the reclamation works stability which are constructed to develop the coastline. Aim of this paper is to investigate the effects of wave pressure on the stability of sandy marine slopes under sea-wave conditions. Study is conducted for a realistic range of values for the friction angle of sand, slope inclination, and sea wave characteristics at different depths and their influences on the structural stability of marine slopes are analyzed. Two wave theories, linear (Airy) wave and Stokes 5th order wave are used to estimate the wave characteristics including wave profile, wavelength, and wave pressure. The stability of slopes is calculated as a function of maximum wave height and wave period using Bishop’s simplified method which represent the moment equilibrium of slopes and Janbu’s simplified method which represent the shear equilibrium of slopes. Safety factors are calculated for a variable range of sliding surface radii to obtain the critical safety factors. Wave pressure above seabed is taken as variable external load on the slope. As expected, it has been found that increasing the wave height reduces the safety factor, while increasing depth along the slope or the angle of repose increases the safety factor. In general, the difference in the safety factor calculated from the Bishop’s simplified method and Janbu’s simplified method are not significant (within ± 5%). The reduction in calculated safety factor (SFr) as ranges from 100% for no wave case and up to 26.8% in the extreme cases.
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