DDARF多尺度网格划分方法及其应用

发布时间：2018-01-11 04:05

本文关键词：DDARF多尺度网格划分方法及其应用　出处：《现代隧道技术》2014年04期 　论文类型：期刊论文

【摘要】：为优化非连续变形分析(Discontinuous Deformation Analysis for Rock Failure)中计算精度和计算时间的关系,文章提出了DDARF多尺度网格划分方法,分别建立了多尺度网格和均匀网格的单轴压缩模型,并进行了数值试验和室内试验的对比;将多尺度网格划分方法应用于大型地下洞室开挖,对洞室附近区域进行了针对性研究。结果表明:DDARF多尺度网格与均匀网格模型单轴压缩试验相比,网格数量相同时提高了裂隙附近的计算精度,裂隙扩展规律与室内试验更为吻合;多尺度网格划分方法应用于地下洞室的开挖,在相同计算精度下减少了计算时间,提高了效率,位移规律和FLAC计算结果吻合度较高;多尺度网格划分方法完善并加强了DDARF模拟岩体裂隙扩展的功能,对大型岩土工程稳定性的优化分析具有重要的实用意义。
[Abstract]:Discontinuous Deformation Analysis for Rock failure to optimize discontinuous deformation analysis. The relation between calculation precision and calculation time in the paper. In this paper, the method of DDARF multi-scale mesh generation is proposed, and the uniaxial compression models of multi-scale mesh and uniform grid are established, and the comparison between numerical experiments and laboratory tests is carried out. The multi-scale mesh generation method is applied to the excavation of large underground caverns, and a targeted study on the area near the cavern is carried out. The results show that the multi-scale meshes are compared with the uniaxial compression tests of the uniform mesh model. When the number of meshes is the same, the accuracy of calculation near the crack is improved, and the law of crack expansion is more consistent with the laboratory test. The method of multi-scale mesh is applied to the excavation of underground cavern. The calculation time is reduced and the efficiency is improved under the same calculation precision. The displacement law is in good agreement with the result of FLAC calculation. The method of multi-scale meshing improves and strengthens the function of DDARF to simulate the crack expansion of rock mass, which is of great practical significance to the optimization analysis of the stability of large geotechnical engineering.
【作者单位】：山东大学岩土与结构工程研究中心;
【基金】：国家自然科学基金重点项目(No.51139004) 教育部博士点基金(No.20110131110030) 山东省自然科学基金重点项目(No.ZR2009AZ001) 中国博士后科学基金面上项目(2012M521339)
【分类号】：TU452
【正文快照】： 数值计算中,综合运用多种手段建立高质量、高计算效率的模型是极其重要的一个步骤。网格划分的形式对计算精度和计算时间将产生直接影响[1~4]。网格密度增加,计算精度会相应有所提高,但同时计算时间也会增加;当网格密度增加到一定程度后,计算精度趋于平稳;网格密度继续增加,计

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