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采用大型静动三轴压缩试验仪,对某面板堆石坝筑坝材料进行了动残余变形试验,研究了砂砾石料和开挖料在循环荷载作用下的残余变形特性及其影响因素。试验资料表明,动荷载作用下第一次循环振动诱发的残余剪应变最大,随着振次增长,剪应变持续增加,在试验设定的振次内,未出现收敛趋势。与之不同,残余体应变在循环荷载作用下有明显的收敛趋势。基于试验结果建立了残余变形与循环振动周次和动剪应变振幅的关系,提出了计算模型。模型共8个参数,均可通过动三轴试验确定,能较好地反映残余应变发展规律。
A large static and dynamic triaxial compression tester was used to test the residual deformation of dam material of a concrete face rockfill dam. The residual deformation characteristics and influencing factors of gravel and excavated material under cyclic loading were studied. The experimental data show that the residual shear strain induced by the first cyclic vibration under the dynamic load is the largest. With the increase of the vibration amplitude, the shear strain continues to increase. There is no convergence tendency within the experimental vibration set. In contrast, residual strain has a clear tendency to converge under cyclic loading. Based on the experimental results, the relationship between the residual deformation and the number of cyclic vibrations and the amplitude of dynamic shear strain was established, and the calculation model was proposed. A total of eight parameters of the model can be determined by dynamic triaxial tests, which can well reflect the law of residual strain development.