弹粘塑性块体单元法在龙滩水电站右坝肩边坡稳定分析中的应用

介绍了三维弹粘塑性块体单元法的基本原理。该方法假定岩石块体为刚体，只考虑结构面的变形和强度特性。在建立块体系统的平衡方程、结构面的变形与块体位移的几何相容方程以及结构面上的弹粘塑性本构方程的基础上，出块体系统位移与稳定的基本方程。针对龙滩水电站右坝肩边坡地质条件复杂，块体稳定问题较为突出的情况，采用块体单元法计算了边坡中典型结构面切割形成的特定块体在不同工况下的强度储备安全系数，并针对结构面的几何参数和力学参数等重要影响因素进行了敏感性分析，为工程设计提供了依据。应用表明，作为一种新型的水工结构数值方法，块体单元法应用于复杂地质条件下的岩石高边坡的稳定和变形分析具有准确、适用和简便的特点。

Application of elasto-viscoplastic block element method to stability analysis of right abutment slope in Longtan Hydropower Project

The principle of 3D elasto-viscoplastic block element method is introduced. This method exclusively takes deformation and strength property of the discontinuities into consideration, with the assumption that the rock blocks are rigid. The governing equation is deduced on the base of the equilibrium equation of block system, the compatible equation of displacement between the discontinuities and blocks and the elasto-viscoplastic constitutive equation of discontinuities. In right abutment slope of Longtan Hydropower Station, the geology is complicated, and the stability of blocks is a serious question. The 3D elasto-viscoplastic block element method is adopted to analyse the stability of the given blocks limited by the typical discontinuities, a series of safety factors of strength reservation under various work conditions are obtained. In the same time, the sensitivity analysis is performed aimed at such important factors influencing the stability of blocks as geometrical and mechanical parameters of discontinuities to provide proposals for engineering design. The application indicates that, as a new numerical method for hydraulic engineering, the elasto-viscoplastic block element method has the merits of validity, practicability and convenience for the stability and deformation analysis of block slope with complicated geology.