Upper-bound limit analysis of seismic sliding stability of waterfront retaining walls under tsunami loading
Aiming at the problem that waterfront retaining walls in coastal areas are prone to passive failure under the combined effect of tsunami and seismicity,the seismic load was determined via the upper-bound limit analysis theory and the pseudo-static method to investigate the seismic sliding stability of coastal retaining walls under the action of tsunamis.The wall-soil system and velocity permissible field of the sliding of the wall and the whole failure wedge were established to derive the expression of the seis-mic acceleration coefficient(kh).The effects of tsunami height,sea level height,groundwater level,wall-soil friction angle,and wall-soil friction angle on the seismic yield acceleration coefficient kcr were analyzed.The results show that the seismic sliding stabil-ity of coastal retaining walls can be effectively improved by controlling the groundwater level at an appropriate height and increasing the wall-soil friction angle.Compared with classical limit equilibrium theory,this method considers the plastic flow of soil and the displacement mode of retaining walls,and does not require the calculation of seismic passive earth pressure values.
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