DDA用于重力坝深层抗滑稳定的接触刚度取值  

The contact stiffness bounds when DDA is applied to the analysis of the gravity dam stability

作　　者：尹晓楠[1] 张国新[1] 

机构地区：[1]中国水利水电科学研究院结构材料研究所,北京100038

出　　处：《中国水利水电科学研究院学报》2012年第4期294-300,共7页Journal of China Institute of Water Resources and Hydropower Research

基　　金：水利部公益行业科研专项(201201050);国家自然科学基金项目(50909105);中国水利水电科学研究院科研专项

摘　　要：复杂地质构造条件下的重力坝深层抗滑稳定性的正确评价是一个关键问题。传统上这个问题一般采用刚体极限平衡法、非线性有限单元方法分析等,各种方法都有局限性。本文以武都碾压混凝土重力坝为例,研究非连续变形分析(DDA)用于重力坝稳定分析的接触刚度取值问题。论文研究了块体的接触刚度对滑动面沿程应力分布、整体安全系数及局部安全系数的影响。结果表明,接触刚度的取值对建基面的整体安全系数基本无影响,但对于多滑面(深层)的抗滑稳定的整体、局部安全系数有较大影响。It is a key problem to evaluate accuratety the gravity dam stability under the complicated geologi- cal situations. Traditionally, it usually employs Rigid Limit Equilibrium Method and non-line Finite Ele- ment Method, but all those methods have limitations. Taking Wudu as the example, this paper researched the values of the contact stiffness when the DDA is applied to analyzing the gravity dam stability. The pa- per studied the effect of the contact stiffness on the stress distribution, the whole safety factor and the lo- cal safety factor. The results demonstrate that the contact stiffness has little influence on the foundation whole safety factor but larger influence on the deep whole stability factor as well as the local safety factor.

关 键 词：重力坝 抗滑稳定 DDA 接触刚度 Sarma 

分 类 号：TV642.3[水利工程—水利水电工程]