The triaxial unloading creep tests on soft clay in Shanghai is described;and the unloading stress path is designed to be close to the field stress path of the soil in the bottom of foundation pit.

• 利用三轴流变试验仪，模拟基坑开挖时坑底土体的应力路径，进行卸载流变试验，并提出一个五元件模型对试验结果进行模拟。