基于突变理论的高拱坝失稳判据研究  

Instability criteria for high arch dams using catastrophe theory

作　　者：郑东健[1] 雷霆[1] 

机构地区：[1]河海大学水利水电工程学院,江苏南京210098

出　　处：《岩土工程学报》2011年第1期23-27,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50879024);国家"十一五"科技支撑计划课题(2006BAC05B03)

摘　　要：高拱坝的整体安全主要取决于拱坝支撑岩体的稳定。由于高拱坝稳定分析的复杂性,其失稳判据至今没有统一的认识。首先讨论了拱坝整体稳定有限元分析失稳判据的基本原理,分析了失稳考察量尖点突变模型的建立方法,随后结合具体工程实例,分析比较了塑性区贯通、位移突变和塑性区总应变能突变判据的优势和不足。实例表明:位移突变判据与敏感测点的选择关系密切,测点选择不同可能得到不同的失稳分析结果;塑性区贯通法受拱坝体系局部和人为因素影响较大;塑性区总应变能突变判据具有单值和反映拱坝整体稳定的特点,是拱坝失稳有限元分析的较优判据。The integral safety of high arch dams mainly depends on the stability of supporting rock system.There is no standard for the instability criteria for high arch dams due to its complexity.The instability criteria for the FEM stability analysis of high arch dam and its cusp catastrophe model are discussed firstly.Then the advantages of plastic zone connection criteria,catastrophe criteria of plastic strain energy and displacement are analyzed.The case shows that the plastic zone connection criteria are affected obviously by dam local factor and artificial factor,and that the displacement catastrophe criteria may produce different stability analysis results due to different monitoring points.Whereas the plastic strain energy is unique and reflected correctly for high arch dams under typical load condition,the catastrophe of the plastic strain energy of high arch dams is a better criterion.

关 键 词：拱坝 整体稳定 有限元分析 失稳判据 突变模型 

分 类 号：TV641[水利工程—水利水电工程]