非连续变形分析的精度改进方法及研究趋势

发布时间：2018-06-10 15:32

本文选题：非连续变形分析(DDA) + 精度　；参考：《岩土力学》2017年06期

【摘要】：由石根华提出的非连续变形分析(DDA)方法理论严密且计算较为高效,在模拟块体滑移、转动和张开等大变形、大位移问题方面具备独特优势,因而在岩土工程领域得到了广泛运用。然而DDA方法在提出初期不可避免地存在一些精度问题,对此石根华及国内外学者就问题产生原因和改进方法开展了大量研究工作。基于部分相关成果的研究学习,对改进原始DDA计算精度的各类方法进行归纳探讨,主要包括:(1)DDA块体内部应力位移场的精度控制;(2)块体接触问题处理方法的改进;(3)人为参数的合理选取;(4)能量耗散机制的考虑;(5)人工边界的改进等方面。对以上方法的改进效果和计算效率进行了简要分析和讨论,在此基础上对DDA的研究热点和发展趋势进行了概述,为该方法的进一步发展和完善提供思路。
[Abstract]:The method of discontinuous deformation analysis proposed by Shi Genhua is rigorous in theory and efficient in calculation. It has unique advantages in simulating large deformation, such as block slip, rotation and opening, and large displacement. Therefore, it is widely used in geotechnical engineering field. However, some precision problems inevitably exist in the initial stage of the DDA method, which has been studied by Shi Genhua and scholars at home and abroad on the cause of the problem and the improvement of the method. Based on the research and learning of some related results, various methods to improve the accuracy of original DDA calculation are summarized and discussed. This paper mainly includes the precision control of stress and displacement field in the DDA block (1) the improvement of the method of dealing with the problem of block contact 3) the reasonable selection of artificial parameters (4) the consideration of energy dissipation mechanism and the improvement of artificial boundary, etc. The improvement effect and computational efficiency of the above methods are briefly analyzed and discussed. On this basis, the research hotspots and development trends of DDA are summarized, which provides ideas for the further development and improvement of the method.
【作者单位】：武汉大学土木建筑工程学院岩土与结构工程安全湖北省重点实验室;
【基金】：国家重点基础研究发展计划(973)项目(No.2014CB046904) 国家自然科学基金重点项目(No.41130742)~~
【分类号】：TU43;TU452

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