基于堆石体二元介质模型的面板坝数值计算

 对于高面板堆石坝而言，在高应力场作用下堆石颗粒破碎明显，从而导致坝体变形率增加，因此在数值计算中必须考虑颗粒破碎的影响，传统的堆石体本构模型由于不能合理反映颗粒破碎的影响，导致计算变形与实测变形差别较大。天生桥面板堆石坝为我国已建工程中同类坝型的第一座200 m级高坝，具有丰富的原型观测资料，在基于考虑堆石体颗粒破碎的二元介质模型的基础上，采用平面有限元分析坝体的应力变形性状，并与实测结果进行了对比分析，结果表明：考虑颗粒破碎后，坝料的剪胀量将会减小，剪缩量相应增大，建议模型的计算结果定性上更加精确，定量上也更为合理，可以更好地反映面板坝尤其是高面板坝的应力变形特性。

NUMERICAL CALCULATION OF CFRD BASED ON BINARY MEDIUM MODEL OF ROCKFILL

For high concrete faced rockfill dam，the grain crushing is so large in high stress field which may increase the deformation rate of dam body that it should be considered in numerical calculation. Because the traditional constitutive model for rockfill material can not reasonably reflect the effects of grain crushing，the calculation deformation of dam body is much different from its measured deformation. Tianshengqiao CFRD (concrete faced rockfill dam) is the first 200 m class high dam which has abound observation date in the similar of type built dam in China. Based on binary medium model considering grain crushing of rockfill material，the stress-strain behavior of dam body is analyzed by planar finite element method(FEM). Because the dilatancy quantity of dam materials will decrease and their corresponding shrinkage quantity will increase when the grain crushing is considered in numerical calculation，the calculation results of the suggested model is more accurate in qualitative analysis and more reasonable in quantitative analysis. It could be better to be used simulate stress-strain behavior of CFRD，especially high CFRD.