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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。
The nonlinear finite element based on the damage constitutive relation can simulate the actual working state of the arch dam more accurately. However, the hydraulic pressure and temperature load, the elastic modulus and the tensile strength , The elastic modulus of foundation rock and so on are random. Taking a high arch dam as an example, taking the temperature load combination as the basic research condition, the nonlinear finite element model of the high arch dam is established according to the topography and geology conditions and the body shape and construction process of the dam. Orthogonal experiment method is used to establish 18 kinds The relationship between the relative damage area and the influencing factors of the built-up surface was calculated by non-dimensional and multiple linear regression analysis. The results show that the relative damage area of foundation is positively correlated with water load and temperature drop load, and negatively correlates with the elastic modulus of foundation rock, the concrete elastic modulus of dam and the tensile strength of dam concrete. The influence of the relative damage area on the foundation surface in order of water load, elastic modulus of foundation rock, concrete elastic modulus of dam, tensile strength of dam concrete and temperature drop load.