堆石料残余变形特性研究

Residual deformation behavior of rock-fill materials

应用自行研制的高精度中型动三轴仪,对某筑坝堆石料的动力残余变形特性进行了试验研究。在充分考虑应力水平对残余动剪应变影响的基础上,对沈珠江提出的模型进行了改进,并利用试验求得的参数对理想面板堆石坝进行了残余变形有限元分析。研究表明:低坝时,改进模型与沈珠江模型计算的结果差别不大;随着坝高的增加、地震烈度的增大,两者计算的结果差别增大。

The residual deformation behaviors of rock-fill materials were experimentally studied by use of a triaxial apparatus with the medium diameter. The major attention was focused on the influence of the stress level. Based on the test results, the residual deformation model presented by Shen Zhujiang was modified. By use of the modified model, the deformation behaviors of concrete faced rock-fill dams were numerically analyzed. It was shown that the deformation predicted by the modified model was close to that by Shen Zhujiang model for low dams, but with the increase of the dam height and earthquake magnitude, the difference between the two models became larger.