【摘要】 基于场地砂土液化的宏观现场证据和简要分析,指出Rayleigh波对距震中中远距离的浅层饱和土层的砂土液化有着很大的影响。通过单相和双相介质模型分析,阐述了Rayleigh波在土中传播的特性以及对土壤液化的影响,指出在浅源地震中Rayleigh波将是中远场地区土壤液化的主要动力影响因素,提出了一些在分析土壤液化时应考虑的新因素和方法。最后提出了在考虑Rayleigh波对土壤液化评判和小区划时应注意的一些问题。更多还原

【Abstract】 In this paper,research results obtained from some macroscopic evidences gained in actual earthquake field investigations and a preliminary theoretical analysis are briefly introduced first.It is pointed out that Rayleigh waves should be an essential cause of liquefaction for those fields beyond epicentral regions and having saturated sand deposits at shallow depths.By using single and two phase medium models,the characteristics of Rayleigh wave propagation and its effects on the sand liquefaction are analyzed,and further works to be done are also suggested to aim at the development of a new comprehensive method of evaluating the liquefaction potential.Finally a preliminary guideline for microzonation of liquefaction on the basis of Rayleigh wave field survey and analysis is presented.更多还原