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采用GDS应力路径三轴仪对杭州原状软黏土开展了一系列不同应力比条件下的排水试验,包括三轴压缩和三轴伸长试验,主要研究p-q平面内应力路径旋转对K0固结原状软黏土小应变刚度和变形特性的影响。试验结果表明:三轴剪切条件下原状软黏土存在显著的小应变刚度特性,在广义剪应变小于0.01%时,小应变刚度变化较小,广义剪应变在0.01%~0.1%阶段,试样小应变刚度衰减最快,剪应变在0.1%时的刚度仅为剪切初始阶段的10%左右。归一化后的原状软黏土小应变刚度随剪应变变化规律可以近似采用指数函数拟合。应力路径旋转对原状软黏土小应变阶段的应力-应变关系及刚度特性都有显著的影响。三轴伸长和压缩排水剪切时,K0固结原状软黏土都发生显著的体缩变形,剪应力对原状软黏土体应变的累积影响更为显著。
Using GDS stress path triaxial apparatus, a series of drainage tests under different stress ratios were carried out in Hangzhou undisturbed clay, including triaxial compression and triaxial elongation tests. Effect of clay small strain on stiffness and deformation characteristics. The experimental results show that there is a significant small strain stiffness characteristic of undisturbed soft clay under triaxial shear conditions. When the generalized shear strain is less than 0.01%, the small strain changes little and the generalized shear strain is between 0.01% and 0.1% Small strain stiffness decay fastest, shear strain at 0.1% of the initial shear stiffness is only about 10% of the initial stage. After normalization, the small strain stiffness of undisturbed soft clay can be fitted exponentially with the change law of shear strain. The stress path rotation has a significant effect on the stress-strain relationship and the stiffness properties of the intact soft clay in the small strain stage. Three-axis elongation and compressive drainage shear, K0 consolidation of the original soft clay significant shrinkage deformation occurred, the shear stress on the original soft clay strain cumulative effect is more significant.