Klnbrein拱坝坝踵开裂探讨及极限承载力分析  

Analysis of dam heel cracking and ultimate bearing capacity of Klnbrein arch dam

作　　者：潘坚文[1] 金峰[1] 徐艳杰[1] 王进廷[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《水力发电学报》2010年第3期148-153,共6页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金项目(50539020);水利部公益性行业科研专项项目(200801007)

摘　　要：作为采用工程类比分析法评价小湾拱坝稳定性的一部分,本文在ABAQUS非线性有限元平台下,采用精细的三维有限元模型模拟了Klnbrein拱坝运行期随着库水涨落的变形状态,模拟计算得到的坝顶位移时程与实测位移非常接近,坝踵屈服区与拱坝的实际开裂形态也比较类似,说明本文建立的Klnbrein模型基本合理。然后对Klnbrein原拱坝和加固后拱坝进行了超载分析,研究其极限承载力,同时引入四个安全系数评价拱坝四级极限状态。分析结果表明:Klnbrein拱坝坝后支撑体加固对于减小正常工作状态下坝踵屈服区的效果显著,帷幕正常工作安全系数由加固前的0.90提高到1.20,保证了拱坝的正常运行。但是,加固措施对于拱坝的极限承载力提高有限。In this work the deformation of Kolnbrein arch dam is simulated for the operation condition of storage level fluctuation by a refined nonlinear 3D FEM model,which provides data for the stability evaluation of Xiaowan arch dam with the engineering analogical method.The time history of the computed crest displacement is close to the field observation,and the simulated yield region of the dam heel is similar to the observed cracking.An overload analysis of this dam using four safety factors for the four states of the arch dam is also performed for the two cases with and without the downstream strengthening supports.These results demonstrate that in the case of applying the supports,the yield region of the dam heel is reduced considerably,and the safety factor of curtain operation is increased from 0.90 to 1.20.The strengthening method,however,enhances little the ultimate bearing capacity relative to the dam without the supports.

关 键 词：水工结构 稳定性 工程类比分析法 高拱坝 

分 类 号：TV31[水利工程—水工结构工程]