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本文通过不同的试验方式对软土进行了不同卸荷路径下的变形特性试验研究。一维压缩回弹试验成果表明,软土的回弹变形随着预压荷载的增大而增大,但与卸荷过程中的卸荷比无关;土样再加荷时的压缩模量小于回弹模量而大于初始压缩模量;得到回弹孔隙比、回弹模量的计算公式,从而计算基坑开挖引起的回弹变形量。三轴卸荷蠕变试验成果表明不同的卸荷路径得到不同性质的蠕变变形;卸荷变形模量随应力路径、时间、荷载的变化而变化。
In this paper, different test methods were used to test the deformation characteristics of soft soil under different unloading paths. The results of one-dimensional compression springback test show that the springback deformation of soft soil increases with the increase of pre-compression load, but has no relation with the unloading ratio in unloading process. The compressive modulus of soil re-loading is less than Rebound modulus and greater than the initial compressive modulus; get the formula of the rebound porosity ratio and the rebound modulus, so as to calculate the amount of rebound deformation caused by excavation. Triaxial unloading creep test results show that different unloading paths have different properties of creep deformation; unloading deformation modulus with the stress path, time and load changes.