Effect of Seismic Acceleration Coefficients on Seismic Passive Earth Pressure Coefficient of Caisson due to Cohesion
Publication: Geo-Congress 2023
ABSTRACT
Caissons are foundation systems of finite width; therefore, consideration of results corresponding to two-dimensional failure wedge (plane strain approach) is not suitable. In the present study, caissons embedded in c-ϕ soil are analyzed using limit equilibrium method considering a three-dimensional failure surface, assumed as oval in the horizontal plane and a logarithmic spiral in the vertical plane. Seismic passive earth pressure coefficient due to cohesion component (Kspc) acting alone is determined corresponding to the critical failure wedge obtained considering resistance due to cohesion (c), surcharge (q), and unit weight components (γ) acting simultaneously. It was observed that magnitude of Kspc increases with increase in seismic acceleration coefficients, which is attributed to larger magnitude of cohesive force due to larger failure wedge acting on the caisson. It was also observed that the increase was much more sensitive to horizontal seismic acceleration coefficient (kh) compared to the vertical seismic acceleration coefficient (kv).
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Geo-Congress 2023
Pages: 24 - 33
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Published online: Mar 23, 2023
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