重力坝深层抗滑稳定失稳判别标准探讨  

Discussion on instability criterion of sliding stability analysis of gravity dam foundation in deep layer

作　　者：王小毛 WANG Xiaomao(Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,China)

机构地区：[1]长江勘测规划设计研究院,湖北武汉430010

出　　处：《水利水电快报》2020年第2期1-4,16,共5页Express Water Resources & Hydropower Information

摘　　要：深层抗滑稳定是重力坝设计中的重要问题。传统的刚体极限平衡法虽然计算简单且有丰富的工程实践,但无法分析坝基的破坏发展过程。数值分析可以模拟坝基应力、变形和破坏机理,在深层抗滑稳定分析中逐步得到广泛应用。基于有限单元法和有限差分法,通过强度折减分析重力坝深层抗滑稳定,探讨了不同失稳判别准则下稳定安全系数的差异性。以葛洲坝水利枢纽为例,采用有限单元法和FLAC3D显式差分法进行了重力坝深层抗滑稳定分析。结果表明,采用塑性区贯通判别准则进行抗滑稳定分析可行有效,控制标准可取为塑性区达到建基面宽度的15%。研究成果可为重力坝深层抗滑稳定设计提供参考。The sliding stability analysis of dam foundation in deep layer is important to the gravity dam design. The traditional rigid limited-equilibrium method is simple,which has been applied to a lot of engineering practices,but it is unable to analyze the failure and development process of dam foundation. The numerical analysis has been applied to simulate the stress,deformation and failure mechanism of the dam foundation,which is commonly used in sliding stability analysis. The stability of gravity dam in deep layer is analyzed by strength reduction based on Finite Element Method(FEM) and Finite Difference Method,and the differences of the safety factors under different criteria of failure are discussed. Taking Gezhouba Project as an example,the sliding stability of gravity dam foundation in deep layer is analyzed by FEM and FLAC3 D. The results show that the plastic zone penetration criterion is effective in analyzing the sliding stability,and the control standard of the plastic zone should be 15% of the width of the foundation. The research results can be as a reference to the design of a gravity dam.

关 键 词：重力坝 深层抗滑稳定 失稳判别标准 有限单元法 FLAC3D显示差分法 葛洲坝水利枢纽 

分 类 号：TV642.3[水利工程—水利水电工程]