堆石料残余变形特性与参数敏感性分析

Residual deformation behavior of rockfill materials and sensitivity analysis of parameters

基于搜集的国内多座土石坝堆石料的动力试验成果,研究了堆石料的振动残余变形特性。在整理试验数据过程中,尝试对沈珠江模型进行改进,改进模型充分考虑固结比对堆石料振动残余变形特性的影响,并能更好地拟合试验数据。通过对理想面板堆石坝进行地震动残余变形计算,对比分析了与沈珠江模型、孔宪京改进模型以及凌华改进模型的异同,阐述了本次改进模型的合理性。此外,在统计大量试验数据的基础上,给出了cvr-rd与cdr/S12-rd关系曲线的平均线及上、下包络线,采用该统计曲线对理想面板堆石坝进行了地震残余变形敏感性分析。计算结果表明:参数c4、c5对坝体残余变形影响较大,参数c1、c2影响程度较小;选取均值曲线参数可应用于缺乏动力试验的中小型土石坝抗震设计。

Based on many dynamic test results about rockfill materials of domestic earth-rock dams, the dynamic residual deformation characteristics of the rockfill materials are studied. During the process of collecting test data, the primary residual deformation model presented by Shen Zhu-jiang is modified along with considering the affect of consolidation ratio and fitting the test data well. Through dynamic residual deformation analysis and calculation of ideal concrete faced rockfill dam （CFRD）, the similarities and differences between the primary residual deformation models presented by Shen Zhu-jiang, Kong Xian-jing, Ling Hua and this paper are given. Then, the rationality of this improved model is elaborated. In addition, based on the statistic analysis of test results, the average, upper and lower envelopes of the curves of c sr- Yd and cdr/ S1^2- - Yd are proposed to calculate the seismic residual deformation of the rockfill materials. With the application of the above, the deformation behaviors of ideal CFRD are numerically analyzed. The results show that the parameters of c4 and c5 have great impact on the residual deformation of the dam; but the parameters of cl and c2 have almost no effect. It＇s significant to apply the mean curve parameters in seismic design of medium and small earth-rock dams and the result has certain reference value.