利用GDS多功能三轴仪,通过控制土样应变增量比开展了饱和砂土部分排水三轴试验;利用超静孔隙水压力、有效应力路径和应力应变关系三方面的实验结果,研究了饱和砂土的渐近状态特性。研究表明,控制应变增量比为常数进行常规三轴加载时,饱和砂土的有效应力比也趋于某一常数,形成渐近状态,且渐近状态应力比随应变增量比的增大而减小。基于土的剪胀特性给出了渐近状态形成的物理机制,并给出了北京某砂土在部分排水条件下渐近状态应力比的试验结果。 By means of GDS multi-purpose triaxial apparatus, triaxial tests of partial drainage of saturated sands were carried out by controlling the strain increment ratio of soil samples. Based on the experimental results of excess pore water pressure, effective stress path and stress-strain relationship, Asymptotic behavior of sand and soil. The results show that when the control strain increment ratio is constant, the effective stress ratio of saturated sands tends to a constant as well as the asymptotic state, and the asymptotic state stress ratio increases with the increase of strain increment ratio And reduce. Based on the dilatancy characteristics of soil, the physical mechanism of asymptotic formation is given. The test results of the asymptotic state stress ratio of a sand in Beijing under partial drainage conditions are given.