有限元超载法在拱坝整体安全分析中的应用
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摘要
拱坝等水工混凝土结构体积庞大结构复杂,确保其安全稳定意义重大。针对拱坝整体安全分析问题,采用D-P屈服准则并利用超载法进行弹塑性有限元计算,根据特征点位移突变判据研究拱坝的整体健康状态。以某高拱坝为例进行有限元计算分析,计算结果表明其安全系数K应在5～5.5之间,并证明了有限元超载法在拱坝整体安全分析中的可行性。
Hydraulic concrete structures such as arch dams are huge and complex, so it is of great significance to ensure their safety and stability. Aiming at the overall safety analysis of arch dams, the D-P yield criterion and the overload method were used to calculate the elastic-plastic finite element method. The overall health state of arch dams was studied according to the displacement catastrophe criterion of characteristic points. Taking a high arch dam as an example, the finite element analysis was carried out. The calculation results showed that its safety factor K should be between 5 and 5.5, and the feasibility of finite element overloading method in the overall safety analysis of arch dam was proved.
Hydraulic concrete structures such as arch dams are huge and complex, so it is of great significance to ensure their safety and stability. Aiming at the overall safety analysis of arch dams, the D-P yield criterion and the overload method were used to calculate the elastic-plastic finite element method. The overall health state of arch dams was studied according to the displacement catastrophe criterion of characteristic points. Taking a high arch dam as an example, the finite element analysis was carried out. The calculation results showed that its safety factor K should be between 5 and 5.5, and the feasibility of finite element overloading method in the overall safety analysis of arch dam was proved.
引文
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[2]戴妙林,李同春.基于降强法数值计算的复杂岩质边坡动力稳定性安全评价分析[J].岩石力学与工程学报.2007,26(S1):2749-2754.
[3]李朝国,陆金池.综合法与超载法在沙牌RCC拱坝坝肩稳定分析中的应用[J].四川联合大学学报:工程科学版.1997,1(3):64-71.
[4]林继镛,王光纶.水工建筑物[M].北京:中国水利水电出版社,2009.
[5]陈国荣.有限单元法原理及应用[M].北京:科学出版社,2009.
[6]Sun P M,Bao T F,Gu C S,et al.Parameter sensitivity and inversion analysis of a concrete faced rock-fill dam based on HS-BPNN algorithm.Sci China Tech Sci,2016,59:1442-1451.
[7]任青文.灾变条件下高拱坝整体失效分析的理论与方法[J].工程力学,2011,28(2):85-96.
[8]李同春,王仁坤,游启升,等.高拱坝安全度评价方法研究[J].水利学报,2007(S1):78-83.
[9]任威威,苏超,陈丽,等.某混凝土高拱坝整体安全度评估[J].水力发电.2012,38(4):21-23.
[10]Ren Q,Li Q,Jiang Y,et al.Theory and methods of global stability analysis for high arch dam[J].Science China Technological Sciences.2011,54(1):9-17.
[11]宋鹏,程琳,田振华.高拱坝安全度计算方法对比分析[J].水力发电.2012,38(10):36-39.
[12]赵尚毅,郑颖人,邓卫东.用有限元强度折减法进行节理岩质边坡稳定性分析[J].岩石力学与工程学报.2003,22(02):254-260.