基于工程类比的小湾拱坝安全评价-岩石力学与工程学报.PDF

第27 卷 第 10 期 岩石力学与工程学报 Vol.27 No.10 2008 年 10 月 Chinese Journal of Rock Mechanics and Engineering Oct.，2008 基于工程类比的小湾拱坝安全评价 金 峰，胡 卫，张楚汉，王进廷 (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) 摘要：将工程类比法推广到拱坝极限承载力的研究，对于小湾拱坝等超高拱坝，由于其条件复杂，工程规模巨大， 简单按照规范设计是不够的，应该以已建工程为对比对象，通过类比研究确定合理的安全标准。基于相同网格尺 寸、相同材料模型以及相同计算软件，以已建工程二滩和 Kolnbrein 加固前后作为类比研究对象，对小湾拱坝的坝 踵开裂及极限承载力进行研究。以超大规模精细有限元模型精确模拟坝体的底缝和地基的地形、断层、蚀变带加 固措施以及建基面卸荷带，以全面评估地质条件对极限承载力的影响。分析结果表明：小湾拱坝极限承载能力要 明显强于Kolnbrein 加固前后，略逊于二滩。但正常工作条件下帷幕的安全裕度不大。 关键词：水利工程；极限承载力；工程类比；高拱坝 中图分类号：TV 642.4 文献标识码：A 文章编号：1000 –6915(2008)10 –2027 –07 ANALOGICAL PROJECT COMPARATIVE STUDY OF SAFETY EVALUATION FOR XIAOWAN ARCH DAM JIN Feng ，HU Wei ，ZHANG Chuhan ，WANG Jinting (State Key Laboratory of Hydroscience and Hydraulic Engineering，Tsinghua University，Beijing 100084，China) Abstract ：An analogical project comparative study method for super-high arch dams is presented since simple standard design is not enough due to the complexity and large scale of super-high arch dams. The safety evaluation for super-high arch dams under design could be performed by comparative study with constructed dams. Choosing Ertan and Kolnbrein Arch Dams as analogical projects，the cracking at dam heel and the ultimate bearing capacity of Xiaowan Arch Dam are studied based on similar mesh size，same material model and same finite element software. The refined Xiaowan finite element model including the simulation of the bottom joint of dam body， terrain ，faults，alteration zone，reinforcement measures and unloading zone of the foundation is adopted to evaluate the effects of these factors on the ultimate bearing capacity of the dam. The conclusions are