Mühendislik ve Yer Bilimleri Dergisi

Yazarlar: Devrim ERDOĞAN

Konular:Mühendislik, Ortak Disiplinler

Anahtar Kelimeler:Effective stress based analysis,Seismic slope stability,Inertial and weakening effects,Excess porewater pressure,Critical seismic acceleration coefficient,Permanent displacements

Özet: Seismic failure and deformation behavior of slopes is dominated by various mechanisms. Initial stress state due to static loading conditions in addition to inertial and weakening effects due to seismic excitation are among the main mechanisms. Inertial effects arise from seismic shear stresses. When they add on to initial static shear stresses, combined shear stresses may exceed available shear strength temporarily and lead to permanent displacements. Weakening effects, on the other hand, arise from straining of the soil mass giving rise to excess porewater pressure generation in cohesionless soils and cyclic degradation effects in cohesive soils which result in reduction in the available shear strength and stiffness. In the context of this paper, effective stress based seismic response analysis and Modified Newmark Method (by Biondi et.al since 1998) for shear strength reduction effects are used in coordination with each other in order to investigate the effect of mentioned factors on excess porewater pressure generation, shear strength behavior, lateral accelerations and permanent displacements of saturated cohesionless infinite slopes.

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