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采用GDS动三轴试验系统对某水电站堆石坝的砂砾料进行了两种级配的动残余变形试验。试验结果表明,在围压比较小时,大部分试验条件下材料的残余剪应变和残余体变与lg(1+N)较好地符合直线关系;当围压较大时,在低动应力水平下试验结果仍能较好地满足线性关系,但随着动应力水平的增加,试验结果的离散程度变大。另外,在相同初始状态条件下,土料抵抗动力荷载变形的能力随着土料中粗颗粒含量的增多而变大。
The GDS moving triaxial test system was used to carry out two kinds of graded dynamic residual deformation tests on the gravel material of a rockfill dam of a hydropower station. The experimental results show that the residual shear strain and residual body deformation of the material are in good linear relationship with lg (1 + N) at most confining pressure when the confining pressure is small. When the confining pressure is large, The experimental results can still satisfy the linear relationship well, but as the level of dynamic stress increases, the dispersion of test results becomes larger. In addition, under the same initial condition, the ability of the soil to resist the dynamic load deformation becomes larger with the increase of the coarse particles in the soil.