ABSTRACT

In this paper, reliquefaction studies of saturated sand deposits prepared at 40% and 60% relative density were tested using a uni-axial shaking table at repeated incremental acceleration loading conditions. The repeated acceleration loading was selected similar to continuous earthquake and associated foreshock/aftershock shaking events observed in recent earthquakes. For experimental testing, sinusoidal acceleration of 0.1 g, 0.2 g, 0.3 g, and 0.4 g loading with 5 Hz frequency was selected and applied sequentially to the model ground after dissipation of generated excess pore water pressure from the previous loading. The generated excess pore water pressure, pore pressure ratio, liquefaction time, variation in soil density, soil displacement and foundation settlement were estimated. The reliquefaction potential of saturated sand bed subjected to repeated acceleration loading was reported.

摘要

在本文中，使用单轴振动台在重复增量加速加载条件下测试了以 40% 和 60% 相对密度制备的饱和砂沉积物的再液化研究。重复加速载荷的选择类似于最近地震中观察到的连续地震和相关的前震/余震事件。对于实验测试，选择 0.1 g、0.2 g、0.3 g 和 0.4 g 加载和 5 Hz 频率的正弦加速度，并在前一次加载产生的超孔隙水压力消散后依次施加到模型地面。估算了产生的超孔隙水压力、孔隙压力比、液化时间、土体密度变化、土体位移和地基沉降。