Previous finite element calculation of asphalt concrete core wall dam is usually performed according to the designed parameters of dam material. However, due to the uncertainty of actual construction quality, the parameters of dam material differ in space. In consideration of such spatial difference, a stochastic finite element analysis method based on Monte-Carlo method is proposed for the stress and deformation of asphalt concrete core wall dam. The distributions of stress and deformation of asphalt concrete core wall dam are obtained and compared with those in designed condition. The impact of spatial difference on stress and deformation is examined, and the probabilities of stress and deformation exceeding those in designed condition are determined as well. Results reveal that deterministic analysis method underestimates the stress and deformation of dam with a 50% probability and the maximum principal stress with a 43% probability; while the result of the present method has a 50% probability of exceeding the designed value in terms of settlement at different positions, and even larger probability in principal stress. The research achievements offer reference for dam safety analysis and design optimization, and can be regarded as a new approach for fine finite element analysis of dam.
Key words
asphalt concrete core wall dam /
spatial difference /
stochastic finite element /
standard-exceeding probability /
material parameters /
stress /
deformation
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References
[1] 郝巨涛. 国内沥青混凝土防渗技术发展中的重要问题[J]. 水利学报, 2008,39(10): 1213-1219.
[2] 涂 幸, 李守义, 李炎隆,等. 沥青混凝土心墙堆石坝应力变形有限元分析[J]. 应用力学学报, 2016, 33(1): 110-115,185.
[3] 代凌辉. 二塘沟水库深厚覆盖层上沥青混凝土心墙坝应力与变形计算分析[D]. 乌鲁木齐:新疆农业大学, 2011.
[4] COROLLER A L. Approach to Bituminous Concrete Core Behavior by FEM Computation[C]∥Proceedings of the 16th Congress of Grandes Presas.San Francisco,1988:997-1027.
[5] 张芸芸, 陈尧隆, 吕 琦, 等. 沥青混凝土心墙坝的应力及变形特性[J]. 水资源与水工程学报, 2009, 20(3): 87-90.
[6] VALSTAD T, SLNES P B, NADIM F, et al. Seismic Response of a Rockfill Dam with an Asphaltic Concrete Core[J]. Water Power and Dam Construction, 1991, 32(12): 77-82.
[7] 杨 鸽, 朱 晟. 考虑堆石料空间变异性的土石坝地震反应随机有限元分析[J]. 岩土工程学报, 2016, 38(10): 1822-1832.
[8] BUCHER C. Structural Reliability and Stochastic Finite Elements[R]. Wiesbaden: NAFEMS, 2003.
[9] IMAI K, FRANGOPOL D M. Geometrically Nonlinear Finite Element Reliability Analysis of Structural Systems Ⅰ: Theory[J]. Computers and Structures, 2000, 77(9): 677-691.
[10]肖亚子, 裴 亮, 陈建康, 等. 某沥青混凝土心墙堆石坝变形特性分析[J]. 水电能源科学, 2016, 34(11): 82-85.
[11]王晓安,刘 志, 伍小玉. 水工沥青混凝土心墙设计控制指标探讨[J]. 水力发电, 2016, 42(3): 11-13.
[12]陈 辉, 刘东海, 戚 蓝. 数字化施工下堆石坝模型参数空间估计及赋值[J]. 岩土工程学报, 2018, 40(2): 278-286.
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