复杂加载路径下堆石料动力本构模型及数值模拟

Bounding-surface hypoplastic model for rockfill materials under complex loading paths and its verification

采用所发展的亚塑性边界面模型，对堆石料在不同固结应力状态、排水条件和加载方式下的典型 试验进行了数值模拟分析。在本构模型的数值实施中，联合应用自适应多步回退欧拉积分规律和局部迭 代加快了选代收敛的速度，提高了积分精度，进而编制了计算程序ＴＴＳＴＲＯＣＫ。数值模拟结果与已有 试验成果的对比分析表明，该模型能够合理、有效地反映堆石料在复杂加载路径下的变形和强度特性， 为深入揭示堆石料累积变形和孔隙水压力的发展特性和进行高混凝土面板堆石坝的非线性耦合静动力分 析提供了理论基础。

The bounding surface hypoplasticity model for rockfill materials modified by the authors is employed to characterize the material behavior for typical tests under different consolidation stress state, drainage condition and loading pattern. An adaptive multistep integration procedure in conjunction with local iteration is used in numerical implementation of the constitutive model to improve the convergence of global iteration and integral precision. Comparisons between model simulations and a sequence of experimental results show that the proposed model and calibration simulation technique are workable effectively for complex loading paths using an unique set of parameters for a given rockfill. The constitutive model is helpful to examine building-up process of residual strain and pore water pressure for rockfill and it can be implemented in static-dynamic coupling analyses of concrete-faced rockfill dams under complex loading conditions.