饱和砂土液化应变发展过程的研究

Study on strain development of saturated sand during liquefaction

通过动三轴试验 ,研究了洞庭湖区饱和砂土液化过程中轴向应变的发展规律 ,根据应力 -应变滞回环随振动次数的变化 ,将液化过程划分为 4个阶段 ,并将轴向应变与砂土的应力路径、孔隙水压力的变化相联系 ,研究表明 :砂土的应变与应力状态紧密相关 .据此 ,观测轴向弹性模量随应变的发展而逐步衰化的过程 。

The development of axial strain in sand during liquefaction is studied using dynamic triaxial testing facility.According to the behavior of strain the development process is divided into four phases and the characteristics of strain in different phases are summarized.The relationship between development of axial strain and development of pore water pressure,relationship between development of axial strain and stress path are investigated.it is found that the axial strain is closely related to te status of stress in sand.On this basis,the attenuation process of axial elasticity modulus following the developemtn of axial strain is investigated.This study promotes the understanding on the process of liquefaction of saturated sand.