不同屈服准则对高拱坝安全度评价的影响分析  

Analysis on influences from different yield criteria on safety degree assessment for high arch dam

作　　者：谢卫生[1] 周秋景[2] 

机构地区：[1]江西省水利规划设计院,江西南昌330029 [2]中国水利水电科学研究院,北京100038

出　　处：《水利水电技术》2010年第11期19-22,共4页Water Resources and Hydropower Engineering

基　　金："十一五"国家科技支撑计划项目(2006BAB04A01;2008BAB29B05);水利部行业公益科研专项(200801007)

摘　　要：为深入认识溪洛渡拱坝安全情况,首先对目前常用的二参数屈服准则及扩展形式对非线性超载计算结果的影响进行研究,结果显示,屈服准则、材料屈服后强度变化方式及是否考虑压坏对拱坝安全度影响十分明显。采用Drucker-prager准则所得内接超载安全度最小,Mohr-coulumb准则较大,Drucker-prager准则外接最大,不同屈服准则得到的安全度不同;同时理想弹塑性材料安全系数最大,单一拉强度软化次之,拉强度和粘聚力同时软化最小;在考虑混凝土材料压坏作用时,安全度会大幅降低。最后研究了工程实例溪洛渡拱坝,进行了安全度计算分析。In order to make a deep knowledge of the safety condition of Xiluodu Arch Dam, the influences from the normal twoparameter yield criteria and their expanded patterns on the results of the non-linear overload calculations are studied at first. The results show that the influences from the yield criteria, the strength changing pattern of the yielded material and whether is taken the pressed damage into consideration are significant on the safety of the dam. Furthermore, different yield criteria would give dif- ferent safety degrees, while the safety factor of a material with an ideal elastic-plastic performance is maximum, with yielding of single tensile strength is medial and with simultaneous yielding of both the tensile strength and the cohesive force is minimum. If the effect from the pressed damage of concrete is considered, the safety degree would be greatly lowered. Finally, Xiluodu Arch Dam is studied as an actual case along with the calculation and analysis made on the safety degree concerned.

关 键 词：拱坝安全度 屈服准则 超载 溪洛渡拱坝 

分 类 号：TV642.4[水利工程—水利水电工程]