【摘要】：探討了一種將隨機場模擬技術(shù)與有限元方法相結(jié)合的隨機有限元法在土石壩地震反應分析中的應用途徑。采用局部平均細分法模擬堆石料物理力學性質(zhì)隨機場,使得能夠考慮堆石料的空間變異性。提出盡量利用建立材料物理性質(zhì)與力學性質(zhì)關系的計算模型,以降低獲取材料力學性質(zhì)統(tǒng)計特性信息的成本。以一實際工程為例,采用該隨機有限元法計算了堆石料的干密度、孔隙比、不均勻系數(shù)、平均粒徑、Duncan Chang E B模型模量系數(shù)以及初始摩擦角具有不確定性時土石壩的隨機地震響應及永久變形。結(jié)果表明:筑壩堆石料的不確定性會使大壩響應及永久變形發(fā)生一定程度的離散;忽略材料的不確定性可能導致低估大壩的地震反應;表征大壩地震反應的各性能指標并不一定都符合正態(tài)或?qū)?shù)正態(tài)分布。
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圖片說明：RFEM分析土石壩隨機地震反應的基本流程
[Abstract]:This paper discusses the application of stochastic finite element method, which combines random field simulation technique with finite element method, in seismic response analysis of earth-rock dam. The local average subdivision method is used to simulate the random field of physical and mechanical properties of rockfill, so that the spatial variability of rockfill can be considered. In order to reduce the cost of obtaining the statistical property information of material mechanical properties, the calculation model of the relationship between physical properties and mechanical properties of materials is established as far as possible. Taking a practical project as an example, the stochastic finite element method is used to calculate the random seismic response and permanent deformation of rockfill dam when the dry density, pore ratio, inhomogeneity coefficient, average particle size, modulus coefficient of Duncan 鈮，

本文編號：2511057