动三轴实验中的饱和砂土孔隙水压力分析

Study on the pore water pressure of saturated sand in dynamic triaxial test

利用动三轴实验 ,对砂土液化中的孔隙水压力发展进行了研究 ,根据孔隙水压力发展过程中的不同现象 ,将该过程划分为 4个阶段 ,并将孔隙水压力与应变、应力路径相联系 ,总结了各种因素对砂土液化中孔隙水压力发展的影响 ,对砂土液化的机理有更深的了解。用剪胀、剪缩、卸荷体缩理论来解释砂土液化过程中出现的各种现象 ,分析认为 ,砂土应力状态与孔隙水压力发展之间的关系密切 。

In the paper, the development of pore water pressure is studied based on the dynamic triaxial test. According to the different behavior of pore water pressure, the process is divided into four phases. Connecting the development of pore water pressure with that of strain and stress path, the authors summarize all kinds of factors which infect the development of pore water pressure, so the mechanism of the saturated sand liquefaction is more clear than before. The phenomenon in the process of sand liquefaction can be explained by the theory of shear contraction, shear dilatation and unloading shrink,the analytic results show that the state of sand stress relates closely to the development of pore water pressure,of which the shear dilatation and unloading shrink are the primary influencing factors also.