【摘要】 饱和砂土在往返荷载作用下的强度、液化和破坏问题关系到对工程安全的估计,乃是近年来在水工建筑物地基和土石坝抗震防震工作中经常探讨的课题.本文对这些问题提出了一些准则和方法,主要认为极限平衡理论可以作为评价饱和砂土在往返荷载作用下开始破坏的准则,而在此基础上提出了相应的试验和分析方法以及区别液化和开始破坏的不同界限.此外,又根据砂土的结构和压缩特性,初步提出了开敞式有效应力动力分析方案.最后并指出了一些尚须研究和重视的问题.更多还原

【Abstract】 The problem of strength,liquefaction and failure of saturated sands has always been greatly concerned in dealing with the safety of foundations of hydraulic structures and earth or earth-rock dams against earthquake action.This paper gives out some criteria and methods for their evaluation. The theory of limit equilibrium has been used as a criterion to evaluate the incipient failure condition of the saturated sands under cyclic loading and the corresponding laboratory tests and analytical methods are suggested.The distinction between liquefaction and incipient failure has been clarified.Furthermore,a preliminary scheme of open-type effective stress dynamic analysis method is proposed.Finally,the subjects for further investigation are remarked and the importance of preventive measures to avoid liquefaction and failure of saturated sands is emphasized.更多还原