1.前言饱和的、松的冲积砂层或没有压实的回填砂层,当受到强烈地震时,就要变成液体状态,使上部各种建筑物遭受巨大损害。液体状的砂,单位体积重量约为1.9～2.0吨/米~3,当地基发生液化时,使重的建筑物产生过大的下沉,使管子、下水道一类轻的构造物上浮,并使堤岸产生过大的沉 1. Introduction Saturated, loose alluvial sands or uncompacted backfill sands, when subjected to strong earthquakes, are to become liquid and cause extensive damage to the upper buildings. The liquid sand has a weight per unit of about 1.9 to 2.0 ton/m~3. When the liquefaction occurs at the base, heavy buildings will sink too much, causing light structures such as pipes and sewers to float up. Causes the embankment to oversize