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对重塑非饱和土样进行了固结压力为50kPa的循环单剪试验。考虑到土样在循环荷载下产生的塑性变形积累,引入物态参数累积体积应变εv来代表循环荷载的影响,对试验结果进行分析,得到了以εv为参数的动应力-应变函数,根据εv与循环次数N的关系,得出动剪模量在不同剪应变条件下随N的衰减关系。通过分析在不同剪应变下衰减趋势得出衰化系数d与剪应变的相关性不太明显,最后拟合出动剪模量归一化量GN/G1随循环次数N的衰减函数形式。
The cyclic single shear test with consolidation pressure of 50 kPa was carried out on the remolded unsaturated soil samples. Taking into account the plastic deformation accumulation of soil samples under cyclic loading, the cumulative volume strain εv of the physical parameters is introduced to represent the influence of cyclic loading. The test results are analyzed and the dynamic stress-strain function with εv as the parameter is obtained. According to εv And the number of cycles N, the dynamic shear modulus obtained under different shear strain with N attenuation relationship. By analyzing the decay tendency under different shear strains, it is not obvious that the attenuation coefficient d is related to the shear strain. Finally, the decay function of the normalized amount GN / G1 of the shear modulus N with the number of cycles N is fitted.