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王建娥, 杨 杰, 程 琳, 马春辉, 冉 蠡.考虑材料参数空间变异性的堆石坝非侵入式随机有限元研究水资源与水工程学报[J].,2019,30(3):200-207
考虑材料参数空间变异性的堆石坝非侵入式随机有限元研究
Study on the noninvasive stochastic finite element method of rockfill dam considering spatial variability of material parameters
  
DOI:10.11705/j.issn.1672-643X.2019.03.31
中文关键词:  堆石坝  材料参数  空间变异性  Cholesky分解  MSC.Marc二次开发  非侵入式随机有限元
英文关键词:rockfill dam  material parametres  spatial variability  Cholesky decomposition  secondary development of MSC.Marc  noninvasive stochastic finite element method (NSFEM)
基金项目:国家自然科学基金项目(41301597)); 西北旱区生态水利工程国家重点实验室开放基金项目(2016ZZKT-8); 陕西省自然科学基础研究计划重点项目(2018JZ5010)
作者单位
王建娥1,2, 杨 杰1,2, 程 琳1,2, 马春辉1,2, 冉 蠡1,2 (1. 西安理工大学 水利水电学院 陕西 西安 710048 2.西安理工大学 省部共建西北旱区生态水利国家重点实验室 陕西 西安 710048) 
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中文摘要:
      为提高面板堆石坝(CFRD)沉降值的计算准确度,引入随机有限元方法(SFEM),以考虑E-B本构模型参数的空间变异性,建立基于Cholesky分解的面板堆石坝非侵入式随机有限元方法(NSFEM)。首先,基于Cholesky分解进行堆石料材料参数的随机场模拟;其次,基于现有商业有限元软件MSC.Marc进行子程序的二次开发,通过UltraEdit在DOS环境下直接调用Marc,对每个单元赋予不同的材料参数,实现“非侵入式”随机有限元计算;随后,结合公伯峡坝体沉降计算,分析了筑坝材料参数的变异系数对沉降的影响规律。计算表明:考虑材料参数空间变异性对堆石坝变形计算结果影响明显,最大沉降值明显大于常规有限元计算值,更接近实测值,更符合工程实际情况。结论:坝体沉降值对材料参数按照敏感性从大到小排序为φ0、K、Kb,对3BII区材料参数的变异性敏感性较3C区更大;采用NSFEM,考虑筑坝材料参数的空间变异性对准确把握CFRD沉降,确保工程安全具有重要意义
英文摘要:
      In order to improve the accuracy of concrete faced rockfill dam (CFRD) settlement, the stochastic finite element method (SFEM) was introduced into the face rockfill dam and the applicability of the E-B constitutive model is enhanced by considering the spatial variability of the parameters of the E-B constitutive model, and a noninvasive stochastic finite element method (NSFEM) for the CFRD based on the Cholesky decomposition was established. First, the random field of parameters of rockfill materials was simulated; Second, the secondary development was achieved based on the existing commercial finite element software MSC.Marc. By calling Marc directly in DOS environment through UltraEdit, each unit was assigned different material parameters, thus the “noninvasive” stochastic finite element analysis method was established. Then, combined with the settlement calculation of Gongboxia dam, the in1uence law of the coefficient of variation of dam material parameters on settlement was analyzed. The calculation results showed that: considering the spatial variability of material parameters, the maximum settlement was obviously larger than the conventional finite element calculation value, which was closer to the actual observed value and more in line with the actual situation of the project. We conclude that the settlement is ranked from large to small: φ0、K、Kb,according to the sensitivity of the material parameters and the sensitivity of the material parameters of the 3BII area is larger than that of the 3C area. Using NSFEM and considering the spatial variability of dam material parameters is of great significance for accurately grasping CFRD settlement and ensuring engineering safety.
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