【摘要】：探討了一種將隨機(jī)場(chǎng)模擬技術(shù)與有限元方法相結(jié)合的隨機(jī)有限元法在土石壩地震反應(yīng)分析中的應(yīng)用途徑。采用局部平均細(xì)分法模擬堆石料物理力學(xué)性質(zhì)隨機(jī)場(chǎng),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(xué)性質(zhì)關(guān)系的計(jì)算模型,以降低獲取材料力學(xué)性質(zhì)統(tǒng)計(jì)特性信息的成本。以一實(shí)際工程為例,采用該隨機(jī)有限元法計(jì)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(shí)土石壩的隨機(jī)地震響應(yīng)及永久變形。結(jié)果表明:筑壩堆石料的不確定性會(huì)使大壩響應(yīng)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(dǎo)致低估大壩的地震反應(yīng);表征大壩地震反應(yīng)的各性能指標(biāo)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(shuō)明：RFEM分析土石壩隨機(jī)地震反應(yīng)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(hào)：2511057