基于混凝土不均匀性面板堆石坝面板损伤分析

发布时间：2018-07-01 12:43

本文选题：面板堆石坝 + 混凝土　；参考：《岩土工程学报》2017年02期

【摘要】：将混凝土面板堆石坝中面板混凝土视为宏观上均质、细观上不均匀的材料,结合统计学原理,考虑材料参数分布的随机性,通过二维有限元数值分析,研究了混凝土的弹性模量和抗拉强度随机性对面板堆石坝面板动力损伤分布规律的影响。计算结果表明:不考虑面板混凝土材料参数随机性时,(0.65~0.85)H(H为坝高)处面板顺坡向应力较大,拉损伤主要发生在0.8H(H为坝高)附近的面板处;随着混凝土材料不均匀性增大,发生拉损伤的部位趋于分散,但主要集中在(0.4~0.9)H范围内的面板。因此这部分面板应该是抗震设计的重点区域。采用混凝土弹脆性细观损伤模型,考虑材料参数的随机性,能够直观地阐明混凝土面板的地震破坏过程和损伤分布,便于了解面板薄弱环节,研究成果可以为混凝土面板堆石坝抗震设计提供参考。
[Abstract]:The concrete face slab in concrete face rockfill dam is regarded as macroscopic homogeneous and mesoscopic uneven material, considering the randomness of material parameter distribution in combination with the principle of statistics, the two-dimensional finite element numerical analysis is carried out. The effects of elastic modulus and tensile strength of concrete on the dynamic damage distribution of face slab of rockfill dam are studied. The calculation results show that when randomness of concrete material parameters is not considered, the slope stress is larger at (0.65 ~ 0.85) H (H is dam height), and tensile damage occurs mainly in the face slab near 0.8 H (H is dam height), and with the increase of non-uniformity of concrete material, The area of tensile damage tends to be dispersed, but mainly concentrated in the (0.4 ~ 0.9) H range of the panel. Therefore, this part of the panel should be the key area of seismic design. Taking into account the randomness of material parameters, the earthquake damage process and damage distribution of concrete slabs can be intuitively clarified by using the elastic-brittle meso-damage model of concrete, and the weak links of concrete panels can be easily understood. The research results can provide reference for seismic design of concrete face rockfill dam.
【作者单位】：大连理工大学海岸与近海工程国家重点实验室;大连理工大学水利工程学院;
【基金】：国家自然科学基金重大研究计划集成项目(91215301);国家自然科学基金项目(51379028,51379028,51508071)
【分类号】：TV641.43;TV312

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