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一、引言研究砂土液化的原因,探讨砂土液化的影响因素,对于地基抗震设计有着重要的作用。从工程设计的观点考虑,需要解决的问题首先是正确判别砂土能否液化,其次是采用有效措施预防液化或减轻液化引起的震害。工程设计需要的判别方法应该包括:1.估计液化的可能性;2.估计液化的范围;3.估计液化的后果。根据现有的对地震和液化机理的认识,对某一特定砂层能否液化的判别只能是近似的估计,特别是对接近临界条件的砂层,很可能出现误判。因此,通常将这种判别称为
I. INTRODUCTION The study of the causes of sand liquefaction and the influencing factors of sand liquefaction have an important role in the seismic design of foundations. From the point of view of engineering design, the problem to be solved is first of all to correctly judge whether the sand can be liquefied, and secondly, to adopt effective measures to prevent liquefaction or reduce the damage caused by liquefaction. The discriminating methods needed for engineering design should include: 1. Estimating the possibility of liquefaction; 2. Estimating the extent of liquefaction; 3. Estimating the consequences of liquefaction. According to the existing understanding of the earthquake and liquefaction mechanism, the discrimination of the liquefaction of a particular sand layer can only be approximated, especially for the sand layer near the critical condition, misjudgment is likely to occur. Therefore, this distinction is often called