岩土力学 ›› 2020, Vol. 41 ›› Issue (S1): 329-336.doi: 10.16285/j.rsm.2019.1306

• 数值分析 • 上一篇    下一篇

基于扩展有限元法的大坝面板脱空三维模拟分析

王翔南1,郝青硕1,喻葭临2,于玉贞1,吕禾1   

  1. 1. 清华大学 水沙科学与水利水电工程国家重点实验室,北京 100084;2. 中国水电顾问集团,北京 100120
  • 收稿日期:2019-07-28 修回日期:2019-11-12 出版日期:2020-06-19 发布日期:2020-06-09
  • 作者简介:王翔南,男,1989年生,博士后,主要从事岩土工程高性能数值分析。
  • 基金资助:
    国家重点研发计划(No.2017YFC0804602,No.2017YFC0404802);国家自然科学基金(No.51479099)。

Three-dimensional simulation of the separation of dam panel based on extended finite element method

WANG Xiang-nan1, HAO Qing-shuo1, YU Jia-lin2, YU Yu-zhen1, LÜ He1   

  1. 1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China; 2. China Hydropower Engineering Consulting Corporation, Beijing 100120, China
  • Received:2019-07-28 Revised:2019-11-12 Online:2020-06-19 Published:2020-06-09
  • Supported by:
    This work was supported by the National Key Research and Development Project(2017YFC0804602, 2017YFC0404802) and the National Natural Science Foundation of China(51479099).

摘要: 混凝土面板与堆石体之间由于变形不协调导致的面板脱空是面板堆石坝工程中常见的现象,严重时可引起面板的开裂并威胁大坝的整体安全,非常有必要计算分析面板是否会出现脱空以及脱空值的大小。针对以往的计算方法难以在直观性、计算精度和容易实施之间取得平衡的现状,尝试将脱空视为物体内部不连续界面发生的相对位移,用扩展有限元法(XFEM)进行模拟分析。首先将一种复合式XFEM接触本构模型扩展到三维,实现在三维条件下XFEM对不连续界面发生张开和错动的表述,再通过一个滑块模型算例用自编程序和ABAQUS的接触力学方法进行模拟和对比,验证该三维界面接触算法的正确性,最后以天生桥面板堆石坝为算例计算了面板部位的脱空情况,并与实测值和对偶mortar方法的计算结果进行对比,验证该方法计算大型实际工程的能力。

关键词: 扩展有限元法, 脱空, 接触本构模型, 三维模拟

Abstract: The separation between concrete face slab and rockfill due to uncoordinated deformation is a common phenomenon in the concrete-faced rockfill dam engineering. It may even cause cracking of concrete face slab and threaten the overall safety of the dam. Therefore, it is necessary to analyze whether the separation will occur and predict the separation magnitude. However, the previous calculation methods can hardly achieve a balance between intuition, accuracy, and ease of implementation. The paper attempts to treat the separation as relative displacements of discontinuous interface in an object and use the extended finite element method (XFEM) to simulate the movement. A hybrid XFEM contact constitutive model is extended to three-dimensional(3D) to describe the three dimensional opening and dislocation of discontinuous interfaces. Results are compared using the self-programming and the ABAQUS contact mechanics methods in a slider model example, and to validate the 3D interface contact algorithm. Taking the Tianshengqiao concrete face rockfill dam as an example, the separation of the face slab is calculated and compared with the measured values and simulated results by the dual mortar method, which verifies the ability of this method to calculate the large-scale practical engineering.

Key words: extended finite element method(XFEM), separation, contact constitutive model, three-dimensional

中图分类号: 

  • O33
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