中文摘要：

堆石料三维边界面模型结合了统一非线性强度准则，可以反映三维应力空间堆石料的应变硬化、软化以及体积收缩和剪胀等传统本构模型难以反映的力学特性。基于三维边界面模型的基本理论，通过FLAC3D提供的二次开发平台，在VC＋＋环境下实现了三维边界面本构模型的二次开发，并给出基于FLAC3D程序的边界面本构模型开发的关键步骤、编程要点和调试方法。利用开发的本构模型，开展了三轴压缩试验的数值模拟计算，并与理论值进行了对比分析。结果表明，嵌入在FLAC3D中的三维边界面本构模型能够较好地反映设定试验条件下的材料性能，而且三维边界面本构模型模型参数简单，都可从常规三轴试验获得，从而验证了三维边界面模型二次开发程序的优越性与合理性。

英文摘要：

Three-dimensional bounding surface constitutive model for rockfill materials incorporating the general nonlinear strengthcriterion can well capture such behaviors of rockfill materials as the strain hardening, the post-peak strain softening, and thevolumetric strain contraction and expansion in the three-dimensional stress space, which cannot be predicted by the traditionalconstitutive model proposed before. Based on the theory of 3D bounding surface constitutive model and according to the furtherdeveloping platform provided by FLAC3D, the 3D bounding surface model is successfully developed in FLAC3D with VC＋＋environment; and then key steps, programming essentials and methods of constitutive model＇s secondary development are givenbased on FLAC3D code. The calculative results of 3D bounding surface model using FLAC30 under general triaxial compression testsare compared with the theoretical values. The results are turned out that the caleulative results can aptly fit the theoretical values andpredict the behaviors of rockfill materials. In particular, model parameters of bounding surface model are simple and can bedetermined by general triaxial tests. Therefore, we can see that it shows the superiority and reasonableness of 3D bounding surfacemodel＇s procedure.