全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
-  2018 

堆石体宏细观力学特性演化机制的离散元模拟 DEM modelling of macro-and meso-mechanisms for rockfill materials

Keywords: 堆石体,多边形离散单元法,双轴压缩,应力-应变-剪胀,宏细观机制

Full-Text   Cite this paper   Add to My Lib

Abstract:

以具有尖角的堆石颗粒材料为研究对象,采用自主开发的多边形离散单元法程序PDEM对其在双轴压缩试验过程中的宏-细观力学特性及变形破坏机制进行系统分析.根据数值试验中试样在不同围压下应力及变形的发展,从颗粒运动角度探讨试样宏观应力应变剪胀特性演化的细观机制;细观组构与宏观应力变形的发展之间具有同步性,反映试样宏细观演化的统一性;通过对颗粒细观各向异性的统计分析,揭示颗粒间摩擦及咬合作用是维持细观力学结构相对稳定的重要因素;通过对力链网络的形态演化分析,发现试样大主应力方向与各向异性主方向一致,力链密集程度随压缩过程先上升后下降,试样孔隙度也随之先减小后增大,反映了试样宏观先减缩后剪胀的特性

References

[1]  李杨,佘成学,焦小亮.堆石料碾压试验的颗粒流模拟新方法[J].岩土力学,2017,38(10):3029-3038.Li Yang,She Chengxue,Jiao Xiaoliang.A new method for simulating rockfill roller compaction using particle flow code[J].Rock and Soil Mechanics,2017,38(10):3029-3038.
[2]  吴良平,程展林,丁红顺.球形颗粒散粒体的强度和变形特性试验研究[J].长江科学院院报,2007,24(5):64-67.Wu Liangping,Cheng Zhanlin,Ding Hongshun.Properties of strength and deformation for spherical particle coarse aggregate[J].Journal of Yangtze River Scientific Research Institute,2007,24(5):64-67.
[3]  刘洋,李晓柱,吴顺川.多块体形状堆石料碾压颗粒破碎数值模拟[J].岩土力学,2014,35(11):3269-3280.Liu Yang,Li Xiaozhu,Wu Shunchuan.Numerical simulation of particle crushing for rockfill of different particles shape under rolling compaction[J].Rock and Soil Mechanics,2014,35(11):3269-3280.
[4]  唐晨景,杨贵,许建宝.玻璃球模拟堆石料强度和变形特性试验研究[J].防灾减灾工程学报,2016,(6):861-865.Tang Chenjing,Yang Gui,Xu Jianbao.Experimental research on strength and deformation characteristics of rockfill by crustal ball[J].Journal of Disaster Prevention and Mitigation Engineering,2016,(6):861-865.
[5]  Zhou W,Yang L,Ma G,et al.DEM modeling of shear bands in crushable and irregularly shaped granular materials[J].Granular Matter,2017,19(2):25.
[6]  金磊,曾亚武,李晶晶.胶结土石混合体力学特性的块石形状效应细观机理分析[J].固体力学学报,2015,36(6):506-516.Jin Lei,Zeng Yawu,Li Jingjing.Analysis of meso-mechanisms of influence of rock block shape on mechanical properties of cemented soil-rock mixture[J].Chinese Journal of Solid Mechanics,2015,36(6):506-516.
[7]  罗滔,Ooi E T,Chan A H C,等.一种模拟堆石料的二维多边形离散单元法及程序[J].岩土力学,2017,38(3):883-892.Luo Tao,Ooi E T,Chan A H C,et al.A 2-D polygon discrete element method for rockfill materials[J].Rock and Soil Mechanics,2017,38(3):883-892.
[8]  Rothenburg L,Bathurst R J.Analytical study of induced anisotropy in idealized granular materials[J].Géotechnique,1989,39(4):601-614.
[9]  张超,展旭财,杨春和.粗粒料强度及变形特性的细观模拟[J].岩土力学,2013,34(7):2077-2083.Zhang Chao,Zhan Xucai Yang Chunhe.Mesoscopic simulation of strength and deformation characteristics of coarse grained materials[J].Rock and Soil Mechanics,2013,34(7):2077-2083.
[10]  Cundall P A,Strack O D L.A discrete numerical model for granular assemblies[J].Géotechnique,1979,29(1):47-65.
[11]  常晓林,马刚,周伟,等.颗粒形状及粒间摩擦对堆石体宏观力学行为的影响[J].岩土工程学报,2012,34(4):646-653.Chang Xiaolin,Ma Gang,Zhou Wei,et al.Influence of particle shape and inter-particle friction angle on macroscopic response of rockfill[J].Chinese Journal of Geotechnical Engineering,2012,34(4):646-653.
[12]  杨涵,徐文杰,张启斌.散体颗粒介质变形局部化宏-细观机制研究[J].岩石力学与工程学报,2015,34(8):1692-1701.Yang Han,Xu Wenjie,Zhang Qibin.Macro-and meso-mechanism of strain localization in granular material[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(8):1692-1701.
[13]  郑俊杰,苗晨曦,谢明星,等.界面特性及填料粒径影响格栅加筋性能的离散元研究[J].岩土工程学报,2013,35(8):1423-1428.Zheng Junjie,Miao Chenxi,Xie Mingxing,et al.Interface properties and influence of particle size on geogrid reinforcement performance by DEM[J].Chinese Journal of Geotechnical Engineering,2013,35(8):1423-1428.
[14]  Luo T,Ooi E T,Chan A H C,et al.The combined scaled boundary finite-discrete element method:Grain breakage modelling in cohesion-less granular media[J].Computers and Geotechnics,2017,88:199-221.
[15]  Bathurst R J,Rothenburg L.Observations on stressforce fabric relationships in idealized granular materials[J].Mechanics of Materials,1990,9(1):65-80.
[16]  罗滔,Ooi E T,Chan A H C,等.一种模拟堆石料颗粒破碎的离散元-比例边界有限元结合法[J].岩土力学,2017,38(5):1463-1471.Luo Tao,Ooi E T,Chan A H C,et al.A combined DEM-SBFEM for particle breakage modelling of rockfill materials[J].Rock and Soil Mechanics,2017,38(5):1463-1471.
[17]  姜景山,程展林,姜小兰.粗粒土二维模型试验研究[J].长江科学院院报,2008,25(2):38-41.Jiang Jinshan,Cheng Zhanlin,Jiang Xiaolan.Two-dimensional model test for coarse-grained soil[J].Journal of Yangtze River Scientific Research Institute,2008,25(2):38-41.
[18]  姜景山,程展林,刘汉龙,等.粗粒土二维模型试验的组构分析[J].岩土工程学报,2009,31(5):811-816.Jiang Jinshan,Cheng Zhanlin,Liu Hanlong,et al.Fabric analysis of two-dimensional tests for coarse grained soils[J].Chinese Journal of Geotechnical Engineering,2009,31(5):811-816.
[19]  孔德志,张丙印,孙逊.钢珠模拟堆石料三轴试验研究[J].水力发电学报,2010,29(2):210-215.Kong Dezhi,Zhang Bingyin,Sun Xun.Triaxial tests on artificial rockfill materials of steel balls[J].Journal of Hydroelectric Engineering,2010,29(2):210-215.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133