考虑堆石料空间变异性的土石坝地震反应随机有限元分析
发布时间：2019-07-06 13:44
【摘要】：探讨了一种将随机场模拟技术与有限元方法相结合的随机有限元法在土石坝地震反应分析中的应用途径。采用局部平均细分法模拟堆石料物理力学性质随机场,使得能够考虑堆石料的空间变异性。提出尽量利用建立材料物理性质与力学性质关系的计算模型,以降低获取材料力学性质统计特性信息的成本。以一实际工程为例,采用该随机有限元法计算了堆石料的干密度、孔隙比、不均匀系数、平均粒径、Duncan Chang E B模型模量系数以及初始摩擦角具有不确定性时土石坝的随机地震响应及永久变形。结果表明:筑坝堆石料的不确定性会使大坝响应及永久变形发生一定程度的离散;忽略材料的不确定性可能导致低估大坝的地震反应;表征大坝地震反应的各性能指标并不一定都符合正态或对数正态分布。
文内图片：
图片说明：RFEM分析土石坝随机地震反应的基本流程
[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，
本文编号：2511057
文内图片：
图片说明：RFEM分析土石坝随机地震反应的基本流程
[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，
本文编号：2511057
本文链接：https://www.wllwen.com/kejilunwen/shuiwenshuili/2511057.html
