【摘要】 采取杭州地区黏土制备重塑超固结土样（OCR=1.00,1.25,1.67,2.00,3.00）进行三轴剪切蠕变试验，研究超固结饱和黏土的时间变形特性和蠕变模型，对模型参数取值进行了分析。结果表明，重塑超固结饱和黏土的应力应变曲线具有应变硬化特征，在恒定偏应力下土样的时间变形曲线具有双曲线特征；超固结比越大，施加偏应力初始阶段试样中产生的超静孔压越小，试样变形进入蠕变阶段的时间越早，且在一定时间内试样的蠕变量发展越小。基于“孔压消散法”确定了超固结土的蠕变起始时间，采用双曲线蠕变模型可以高度拟合超固结饱和黏土剪切蠕变发展规律，曲线拟合分析表明：在相同的偏应力下，不同超固结比试样的最终蠕变量大致相等，但是超固结比越大时，土样蠕变发展越缓慢，表现为双曲线蠕变模型参数As在超固结比变化时几乎保持为常量，参数Bs则随超固结比的增大近似呈线性增长。更多还原

【Abstract】 The triaxial shear creep tests are carried out on the reconstituted over-consolidated clay samples(OCR=1.00, 1.25,1.67, 2.00, 3.00) from Hangzhou, China. The time-dependent deformation characteristics and creep model for the over-consolidated saturated clay are studied, and the values of model parameters are analyzed. The results show that the stress-strain curve of the reconstituted over-consolidated saturated clay has strain-hardening characteristics. The time-deformation curves of the over-consolidated clays under constant deviator stress are of hyperbolic characteristics. The larger the over-consolidation ratio, the smaller the excess pore pressure generated at the initial stage of the deviator stress application, the earlier the creep stage starts, and the smaller the creep evolution of the sample within a certain time. Based on the “pore pressure dissipation method”, the t EOP of the over-consolidated clay is determined. The hyperbolic creep model can highly fit the shear creep curves of the over-consolidated saturated clay. The curve fitting analysis shows that under the same deviator stress, the final creep values of the samples with different over-consolidation ratios are roughly equal. However, the larger the over-consolidation ratio, the slower the creep development of clay. The hyperbolic creep model parameter As almost remains constant when the over-consolidation ratio changes, while the parameter Bs approximately linearly increases with the increase of the over-consolidation ratio.更多还原