高拱坝建基面相对损伤面积敏感性分析

发布时间：2018-03-25 17:39

本文选题：损伤　切入点：高拱坝　出处：《水电能源科学》2016年07期

【摘要】：基于损伤本构关系的非线性有限元能较为真实地模拟拱坝的实际工作性态,但用于高拱坝安全度评价时水压力和温度荷载、坝体混凝土的弹性模量和抗拉强度、地基岩石的弹性模量等均具有随机性。以某高拱坝为例,以温降荷载组合作为基本研究工况,根据地形地质条件和坝体体形及施工过程,建立高拱坝非线性有限元计算模型,通过正交试验法建立18种计算方案,得到不同方案下上下游面、建基面相对损伤面积,再运用无量纲化和多元线性回归分析的方法计算建基面相对损伤面积与各影响因素之间的关系。结果表明,建基面相对损伤面积与水荷载、温降荷载呈正相关,与地基岩石弹性模量、坝体混凝土弹性模量、坝体混凝土抗拉强度呈负相关。对建基面相对损伤面积的影响程度从大到小依次为水荷载、地基岩石弹性模量、坝体混凝土弹性模量、坝体混凝土抗拉强度、温降荷载。
[Abstract]:The nonlinear finite element method based on damage constitutive relation can simulate the actual working behavior of arch dam, but it can be used to evaluate the safety of high arch dam under water pressure and temperature load, the elastic modulus and tensile strength of concrete. The elastic modulus of foundation rock is random. Taking a high arch dam as an example, taking the combination of temperature drop load as the basic research condition, the nonlinear finite element calculation model of high arch dam is established according to the topographic and geological conditions, the shape of the dam body and the construction process. Through orthogonal test, 18 kinds of calculation schemes are established, and the relative damage area of the upper and lower reaches and the foundation surface is obtained under different schemes. The relationship between the relative damage area of the foundation surface and the influencing factors is calculated by the method of dimensionless and multivariate linear regression analysis. The results show that the relative damage area of the foundation surface is positively related to the water load and temperature drop load. There is a negative correlation between elastic modulus of foundation rock, elastic modulus of dam body concrete and tensile strength of dam body concrete. Elastic modulus of dam concrete, tensile strength of dam concrete, temperature drop load.
【作者单位】：江西省上饶市水利电力勘测设计研究院;
【分类号】：TV642.4

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