Abstract
During earthquake, liquefaction can cause slope failure that can significantly affect the behavior of the structure. Therefore, the slope stability must be appropriately evaluated considering the liquefaction. This study evaluated the slope stability according to the increase in the excess pore water pressure (<i>r</i><sub>u</sub>) using the centrifuge model experiment and limit equilibrium analysis, and investigated the stabilizing effect of piles against sliding during earthquake. The results indicated that the increase in <i>r</i><sub>u</sub> directly affected the reduction in the safety factor in the saturated sand model, and the decrease rate of the safety factor mainly depended on the <i>r</i><sub>u</sub> than whether or not piles are installed. Therefore, the analysis must be performed considering the <i>r</i><sub>u</sub> in evaluating the slope stability where liquefaction occurs.
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