堆石料的动力残余应变模型

基于国内多座土石坝筑坝材料的动力试验成果,研究了堆石料的动力残余变形特性。分析了沈珠江及其改进模型、朱晟模型和水科院模型的差异及存在的问题。在此基础上,建立了以围压和动应力为自变量,并考虑应力水平影响的堆石料残余应变模型。分析比较发现,提出的新模型能够较好地吻合试验结果。

Model for dynamic residual strain behavior of rockfill materials

According to the collected dynamic test results of rockfill materials from many earth-rock dams in China, the dynamic residual strain characteristics of these soils are studied. The differences among the primary residual strain models by Shen Zhujiang, Zou Degao, Ling Hua, Zhu Sheng and Zhao Jianming as well as their limitations are analyzed. After that, a new model for residual strain of rockfill materials is proposed based on some collected test results. In this model, the residual shear strain and residual volumetric strain are a function of confining pressure and dynamic cyclic stress, while the residual shear strain is also affected by the static shear stress level. By analyzing the results, it is found that the simulated residual strain curves by the proposed model agree well with the test results under the same stress condition.