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本文探讨了循环荷载作用下饱和砂土的极限平衡条件和液化破坏过程,给出了一个可用于饱和砂层地震稳定性分析的广义库伦公式。提出了一种方法:根据一个砂土液化试验记录的分析,给出饱和砂土的动力有效应力抗剪强度。为了工程应用的目的,建议把循环荷载作用下饱和砂土的破坏过程分为两个阶段,并把这两个阶段的起点作为饱和砂土的破坏准则。此外,也给出了饱和砂土液化破坏时破坏面上循环剪应力与循环荷载次数间的一般关系。
In this paper, the limit equilibrium conditions and liquefaction failure processes of saturated sand under cyclic loading are discussed. A generalized Coulomb formula for seismic stability analysis of saturated sands is given. A method is proposed: According to the analysis of a sand liquefaction test record, the dynamic effective stress shear strength of saturated sand is given. For the purpose of engineering application, it is suggested that the failure process of saturated sand under cyclic loading be divided into two stages, and the starting point of these two stages should be taken as the failure criterion of saturated sand. In addition, the general relationship between the cyclic shear stress on the failure surface and the number of cyclic loads during the liquefaction failure of saturated sand is also given.