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利用室内三轴蠕变试验结果,分析和研究了上海软黏土不同应力下的变形时间效应。试验表明,在弹性范围内软土可以用五元件黏弹性模型进行模拟。将建立的黏弹性元件模型应用到近邻地铁的深基坑开挖,分析了基坑支护结构倾斜、墙间留土与不留土流变速率的影响以及隧道不均匀沉降的规律,并与实测数据进行了对比。结论表明五元件黏弹性模型可以模拟软土深基坑的开挖流变效应。
The indoor triaxial creep test results were used to analyze and study the deformation time effect of Shanghai soft clay under different stresses. Experiments show that in the elastic range of soft clay can be five-element viscoelastic model for simulation. The established viscoelastic element model is applied to the excavation of deep foundation pit in the adjacent metro. The influence of pit supporting structure inclination, soil retaining and undrained soil rheological rate and uneven settlement of tunnel are analyzed. Measured data were compared. The conclusion shows that the five element viscoelastic model can simulate the excavation rheology of soft soil deep foundation pit.