STUDY ON SUBMARINE SLOPE STABILITY OF CAOFEIDIAN PORT CONSIDERING WAVE AND SEISMIC DYNAMIC EFFECTS

Dynamic loads such as waves and earthquakes can easily cause submarine slope instability,and further lead to the occurrence of submarine landslides,endangering the safety of ports,docks and marine engineering constructions. In this study,the submarine slope in the deep trough of south Caofeidian Port is investigated. To quantitatively calculate the stability of the submarine slope,the finite element method combined with the limit equilibrium method is used considering the effects of real wave loads and seismic loads. The mechanism of dynamic effects on the stability of submarine slopes under special circumstances is also investigated. The results show that extreme wave loads and seismic dynamic loads play an important role in the stability assessment of submarine slopes. Wave loads with a recurrence interval of 50 years and seismic dynamic loads with a peak acceleration of 0.15g can lead to the instability of submarine slopes. Seismic loads can produce larger permanent displacements on submarine slopes. In addition,the erosion and weakening of the rock and soil strength induced by dynamic effects can further reduce the safety factor of the slope under various working conditions,which cannot be ignored in stability analysis of submarine slopes.