粉煤灰最大往返剪切作用面上应变破坏标准的应力条件

基于文献1]提出的最大往返剪切作用面上的液化应力条件和粉煤灰的动三轴试验数据,运用回归分析方法拟合曲线及相关参数建立了粉煤灰的破坏应力条件,并应用F检验法对参数的回归效果进行了检验,检验结果表明参数的回归效果高度显著。得出的破坏应力条件表明初始剪应力与动剪应力的倒数间并不呈线性关系,而是二次多项式关系,这与张克绪所提出的应力条件存在着差异。因此,可初步认为张克绪的液化应力条件不能直接运用于粉煤灰。

The Failure Stress Condition on the Maximum Cyclic Shear Surface Associated with the Failure Stain Criterion of Flyash

The reference1] suggested the failure stress condition on the maximum cyclic shear surface for saturated sands in 1980s.According to his study,sand will fail when by the criterion that the pore water pressure is equal to the confining pressure.Based on Zhang Ke-xu′s formula and the dynamic triaxial test data of flyash,the failure stress condition on the maximum cyclic shear surface is established in this paper for flyash by using the method of regression analysis to fit curves and derive correlation parameters.In addition,the regression effect of the parameters is tested by the method of F test and the results indicated that the regression effect of the parameters is highly significant.The failure stress condition set up in this paper has shown that the relationship between the initial shear stress ratio and the reciprocal of cyclic shear ratio is not linear but quadratic.This result does not agree with Zhang Ke-xu′s formula which shows that the relationship between the two facts mentioned above is linear.So it can be concluded that Zhang(Ke-xu′s) failure stress condition on the maximum cyclic shear surface is not suitable for flyash.However,further work nust be done to make sure whether the formula set up in the paper is applide to other types of soils.