摘要
左岸边坡强卸荷块体系统的稳定问题是白鹤滩水电站题重要工程技术问题之一。针对左岸边坡地形地质条件、变形特征及变形机理的研究,表明结构面组合的三维块体滑动失稳为其主要的破坏模式。常规刚体极限平衡法和连续介质力学方法在求解复杂块体系统稳定时均存在一定的局限性。以块体单元自动识别方法为前处理程序,建立白鹤滩左岸边坡块体系统三维模型,基于弹黏塑性块体单元法(BEM)计算特定块体强度储备安全系数,进行边坡稳定性研究,分析边坡控制性结构面及其关键块体,研究结果与常规刚体极限平衡分析和地质力学模型试验基本一致。块体单元法的分析成果为左岸边坡加固处理提供了依据,同时对复杂块体系统岩体边坡的稳定性研究具有一定指导意义。
The stability of unloading block on the left bank slope has been a critical issue for Baihetan hydropower station.Study on the geologic condition,failure characteristics and deformation mechanism indicates that the sliding failure of three dimensional rock blocks along discontinuities is the main potential failure mode of the left slope.General limit equilibrium method and continuum mechanics method both have some limitations in analyzing the stability of complex block system.In this paper,the method of automatically identifying block is employed to establish the block system model of the left slope.Three-dimensional elasto-viscoplastic block element method（BEM） is adopted to calculate the strength reserve safety factor of sliding blocks.And the controlling discontinuities and the key blocks are revealed.Research results are consistent with both the general limit equilibrium analysis and geomechanical model test,which supports the reinforcement measures for the left slope.The study in this paper could be a guide for the stability analysis of complicated rock block system.
出处
《长江科学院院报》
CSCD
北大核心
2014年第11期71-75,共5页
Journal of Changjiang River Scientific Research Institute
