【摘要】 在二维应力状态下，地震在土体中不仅产生动水平剪应力τhd，而且也引起在一般情况下不可忽略的竖向与水平动正应力差[σvd－σhd]／2，二者定义为动偏应力之二分量，均应是评估土体或土工结构物变形及稳定性的主要因素．本文给出了在地震动偏应力二分量共同作用下，土单元中最大往返剪切作用面及其上最大动剪应力比[τd／σs］max的确定方法．据此，提出了地震触发砂土液化的应力条件及液化判别准则。更多还原

【Abstract】 The cyclic shearing stress induced by earthquake in earth includes cyclic normal stress difference, [σvd - σhd]/2, and horizontal tangential cyclic shearing stress, τhd These two componentS of cyclic shearing stress are the main factors complicating procedures for assessing the deformation or stability of earth and earth structures during earthquake. In this paper, the method of ascertaining the maximum cyclic shearing stress plane and the maximum cyclic shearing stress ratio[τd/τs]max in soil unit under two components of cyclic shearing stress, τhd and [σvd-σhd]/2, during earthquake is presented. The cyclic stress condition and assessing criterion of sand liquefaction are brought up.更多还原