拱坝三维非线性有限元分析及整体安全度评价——以杨房沟水电站为例  

Three-dimensional Nonlinear Finite Element Analysis and Global Safety Evaluation of the Arch Dam in Yangfanggou Hydropower Station

作　　者：黄熠辉[1] 何明杰[1] 黄维[1] 孙林松[2] 郭兴文[2] 

机构地区：[1]中国电力建设集团华东勘测设计研究院有限公司,浙江杭州310014 [2]河海大学,江苏南京210098

出　　处：《水电与新能源》2015年第10期19-22,共4页Hydropower and New Energy

摘　　要：采用三维非线性有限元法,模拟了杨房沟拱坝坝体、坝基岩体及主要断层结构面,对坝体进行了位移应力分析,并结合三维极限平衡法分析,对坝肩关键性的可能滑动块体进行了有限元法抗滑稳定分析,论证了两岸关键性的滑块抗滑稳定安全系数均满足设计要求。超载法计算分析成果表明,杨房沟拱坝起裂超载系数在1.6左右,拱坝强度超载系数为4.5~5.0,与国内同等规模拱坝水平相当。在地震作用下,拱坝变形和应力与国内同等工程相类似,坝肩可能滑动块体抗震稳定性满足要求。综上所述,杨房沟高拱坝在正常工况、超载工况及地震工况下均具有较好的整体安全性。Three-dimensional nonlinear finite element analyses are carried out on the arch dam in Yangfanggou Hydropower Station,in which the arch dam,the rock foundation and major fault structural planes are simulated. The stability of the dam abutment is then analyzed by the three-dimensional limit equilibrium method. Results show that the crack initiation and ultimate strength overload coefficients of the arch dam are 1. 6 and 4. 5 ~ 5. 0 respectively,which are of the same level as similar arch dams in China. Under the earthquake condition,deformation and stresses of the dam body are similar to other arch dams. The stability of the dam abutment against sliding also meets the design requirement. In conclusion,the Yangfanggou arch dam is of good global safety levels under the normal,overload and earthquake conditions.

关 键 词：拱坝 三维非线性有限元法 抗滑稳定 超载法 屈服破坏 整体安全度 

分 类 号：TV642.4[水利工程—水利水电工程] TV698.21