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一、引言 多年来,国内外士力学工作者对于饱和砂土液化的试验技术和分析方法已经做了不少工作,取得了较大的成绩。这些方法对于估计现场的地震性状和判断液化提供了有用的依据。但是,这些工作大部分是在不排水条件假设下进行的,严格说来,只适用于砂层不排水的情况。事实上,当砂层的渗透系数较大以及地震时间较长时,土层内震动引起的孔隙水压力可以重新分配和消散,这一现象必然对液化的发生和发展起着较大
I. INTRODUCTION Over the years, domestic and foreign engineers have done a lot of work on the experimental techniques and analytical methods for the liquefaction of saturated sand, and achieved great results. These methods provide a useful basis for estimating seismic traits on site and judging liquefaction. However, most of these tasks are carried out under the assumption of undrained conditions. Strictly speaking, they apply only to the case where sand is not drained. In fact, when the permeability coefficient of the sand layer is large and the earthquake time is long, the pore water pressure caused by the vibration in the soil layer can be redistributed and dissipated. This phenomenon will inevitably play a greater role in the occurrence and development of liquefaction.