一种改进的二维DDA接触查找方法

发布时间：2018-03-17 06:39

本文选题：数值模拟　切入点：DDA　出处：《岩土力学》2017年03期 　论文类型：期刊论文

【摘要】：非连续变形分析(discontinuous deformation analysis,DDA)方法在处理非连续变形问题中具有显著的优越性,但由于需要处理接触并进行开闭迭代,计算量较大。为了提高DDA方法中接触查找部分的计算效率,并保持较高的精确度,通过改变距离准则下的接触查找方式,提出了改进的接触查找算法。在接触查找前增加预判,减少需要判断的角点数目,并区分两种类型的角-边接触,将对这两种角-边接触的查找分配到不同循环体中,改造了距离准则下的接触查找逻辑。通过两个计算模型来验证改进后程序的准确性和高效性,模型1用来检验程序在各种接触条件下的计算结果,计算结果表明,改进后的程序精确度可以满足;模型2采用东河口滑坡模型,计算结果表明,在保证计算结果精度的前提下,改进后程序的计算效率可提高10%左右。
[Abstract]:Discontinuous deformation analysis method has obvious advantages in dealing with discontinuous deformation problems. However, due to the need to deal with contact and open and close iteration, the computation is large. In order to improve the computational efficiency of contact search part in DDA method, By changing the contact search method under the distance criterion, an improved contact search algorithm is proposed, which increases the number of corner points to be judged before contact search, reduces the number of corner points to be judged, and distinguishes two types of angle-edge contact. This paper allocates the two kinds of angle-edge contact to different loop bodies, reconstructs the contact search logic under the distance criterion, and verifies the accuracy and efficiency of the improved program by two computational models. Model 1 is used to verify the calculation results of the program under various contact conditions, the results show that the accuracy of the improved program can be satisfied, and model 2 adopts the East Estuary landslide model, and the calculation results show that, The calculation efficiency of the improved program can be increased by about 10% under the premise of ensuring the accuracy of the calculation results.
【作者单位】：西南交通大学土木工程学院;西南交通大学交通隧道工程教育部重点实验室;九州大学基干教育院;
【基金】：国家自然科学基金(No.51408511,No.41672286) 日本学术振兴会(No.16F16056)~~
【分类号】：TU45

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