基于DIC的受载砂土颗粒体系的细观参数及运动分析
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摘要
本文结合DIC方法对砂土体系进行可视化的直剪试验。通过对所采集的数字图片进行预处理,得到利于计算砂土体系细观参数的优质图片,经过图像分割和区域标记,最后利用MATLAB计算得到体系孔隙率、定向率和各向异性率等细观参数。对图像进行DIC计算分析,得到砂土颗粒体系的位移等值线云图,分析了体系内的砂土颗粒在直剪试验中的运动情况,并定性描述了位移突变对体系部分力链传递过程的影响。
In this paper,based on digital image correlation(DIC)method,visual direct shear test of a sand system is report.Through pretreatment of the collected digital images,high-quality pictures were obtained, which is benefit to meso parameter calculation of sand system. After image segmentation and region labeling,MATLAB calculation was used to calculate the porosity,rate of orientation and anisotropy of the system.Then,DIC calculation and analysis of picture were adopted to obtain the displacement contour cloud chart.The movement of sand particle in direct shear test was analyzed,and the effect of displacement mutation on the force chain transfer process was described qualitatively.
In this paper,based on digital image correlation(DIC)method,visual direct shear test of a sand system is report.Through pretreatment of the collected digital images,high-quality pictures were obtained, which is benefit to meso parameter calculation of sand system. After image segmentation and region labeling,MATLAB calculation was used to calculate the porosity,rate of orientation and anisotropy of the system.Then,DIC calculation and analysis of picture were adopted to obtain the displacement contour cloud chart.The movement of sand particle in direct shear test was analyzed,and the effect of displacement mutation on the force chain transfer process was described qualitatively.
引文
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[17]孔亮,陈凡秀,李杰.基于数字图像相关法的砂土细观直剪试验及其颗粒流数值模拟[J].岩土力学,2013(10):2971-2978(KONG Liang,CHEN Fanxiu,LI Jie.Microscopic shear text and particle flow numerical simulation of sand which based on digital image correlation method[J].Chinese Journal of Geotechnical Engineering,2013(10):2971-2978(in Chinese))
[18]宋彦琦,高春艳,牛建广.应用MATLAB图像处理技术提取云纹中心线[J].实验力学,2006,21(5):640-644(SONG Yanqi,GAO Chunyan,NIU Jianguang.Application of MATLAB on the central lines traction of moir[J].Journal of Experimental Mechanics,2006,21(5):640-644(in Chinese))
[19]洪宝宁,刘鑫.土体微细结构理论与试验[M].科学出版社,2010:64-65(HONG Baoning,LIU Xin.Microstructure theory and experiment of soil[M].Beijing:Science Press,2010:64-65(in Chinese))
[20]陈凡秀,张慧新,庄琦.基于DIC的颗粒间接触力计算及力链分析[J].应用力学学报,2015(2):244-250(CHEN Fanxiu,ZHANG Huixin,ZHUANG Qi.The quasi-static response of granular materials to a concentrated loading[J].Chinese Journal of Applied Mechanics,2015(2):244-250(in Chinese))
[2]施斌,姜洪涛.粘性土的微观结构分析技术研究[J].岩石力学与工程学报,2001,20(6):864-870(SHI Bin,JIANG Hongtao.Research on the analysis techniques for clayey soil[J].Chinese Journal of Rock Mechanics and Engineering,2001,20(6):864-870(in Chinese))
[3]孙其诚.颗粒物质力学导论[M].北京:科学出版社,2009(SUN Qicheng.Introduction to mechanics of particulate matter[M].Beijing:Science Press,2009(in Chinese))
[4]郑颖人,孔亮.岩土塑性力学[M].北京:中国建筑工业出版社,2010(ZHENG Yingren,KONG Liang.Geotechnical plastic mechanics[M].Beijing:China Architecture and Building Press,2010(in Chinese))
[5]刘传奇,孙其诚,王光谦.颗粒介质结构与力学特征研究综述[J].力学与实践,2014,36(6):716-721(LIU Chuanqi,SUN Qicheng,WANG Guangqian.The multiscale structure of granular matter and its mechanics[J].Mechanics in Engineering,2014,36(6):716-721(in Chinese))
[6]ZHANG Guohua,SUN Qicheng,SHI Zhiping,et al.Effect of size polydispersity on the structural and vibrational characteristics of two-dimensional granular assemblies[J].Chinese Physics B,2014,23(7):589-595.
[7]辛海丽,孙其诚,刘建国等.刚性块体压入颗粒体系时的受力及力链演变[J].岩土力学,2009,30(增):88-98(XIN Haili,SUN Qicheng,LIU Jianguo,et al.Evolution of force chains in a granular assembly based on indentation test[J].Rock and Soil Mechanics,2009,30(S):88-98(in Chinese))
[8]Oda M,Nemat-Nasser S,Mehrabadi M M.A statistical study of fabric in a random assembly of spherical granule[J].International Journal for Numerical and Analytical Methods in Geomechanics,1982,6(1):77-94.
[9]刘建国.颗粒物质局部化行为的细观研究[D].清华大学,2013(LIU Jianguo.Mesoscale study on localization in granular matter[D].Tsinghua University,2013(in Chinese))
[10]潘兵,俞立平,吴大方.使用双远心镜头的高精度二维数字图像相关测量系统[J].光学学报,2013(4):97-107(PAN Bing,YU Liping,WU Dafang.High-accuracy two-dimensional digital image correlation measurement system using a bilateral telecentric lens[J].Acta Optica Sinica,2013(4):97-107(in Chinese))
[11]江天云,潘兵,夏勇等.三维数字图像测量系统稳定性的实验研究[J].实验力学,2014,29(6):703-710(JIANG Tianyun,PAN Bing,XIA Yong,et al.Experimental study of the stability of three-dimensional digital image processing system[J].Journal of Experimental Mechanics,2014,29(6):703-710(in Chinese))
[12]Cuiru Sun,Beau Standish,Barry Vuong,et al.Digital image correlation-based optical coherence elastography[J].Journal of Biomedical Optics,2013,18(12):121515.
[13]李元海,朱合华,靖洪文等.基于数字照相的砂土剪切变形模式的试验研究[J].同济大学学报(自然科学版),2007(5):685-690(LI Yuanhai,ZHU Hehua,JING Hongwen,et al.Experimental investigation of shear deformation patterns in sands based on digital image correlation[J].Journal of Tongji University(Natural Science),2007(5):685-690(in Chinese))
[14]李元海,靖洪文,朱合华等.基于图像相关分析的土体剪切带识别方法[J].岩土力学,2007(3):522-526(LI Yuanhai,JING Hongwen,ZHU Hehua,et al.A technique of identifying shear band accurately in granular soil using image correlation analysis[J].Rock and Soil Mechanics,2007(3):522-526(in Chinese))
[15]张嘎,牟太平,张建民.基于图像分析的土坡离心模型试验变形场测量[J].岩土工程学报,2007(1):94(ZHANG Ga,MOU Taiping,ZHANG Jianmin.Displacement measurement using image analysis in centrifuge modeling of slopes[J].Chinese Journal of Geotechnical Engineering,2007(1):94(in Chinese))
[16]Kuo C Y,Frost J D,Chameau J L A.Image analysis determination of stereology based fabric tensors[J].Geotechnique,1998,48(4):515-525.
[17]孔亮,陈凡秀,李杰.基于数字图像相关法的砂土细观直剪试验及其颗粒流数值模拟[J].岩土力学,2013(10):2971-2978(KONG Liang,CHEN Fanxiu,LI Jie.Microscopic shear text and particle flow numerical simulation of sand which based on digital image correlation method[J].Chinese Journal of Geotechnical Engineering,2013(10):2971-2978(in Chinese))
[18]宋彦琦,高春艳,牛建广.应用MATLAB图像处理技术提取云纹中心线[J].实验力学,2006,21(5):640-644(SONG Yanqi,GAO Chunyan,NIU Jianguang.Application of MATLAB on the central lines traction of moir[J].Journal of Experimental Mechanics,2006,21(5):640-644(in Chinese))
[19]洪宝宁,刘鑫.土体微细结构理论与试验[M].科学出版社,2010:64-65(HONG Baoning,LIU Xin.Microstructure theory and experiment of soil[M].Beijing:Science Press,2010:64-65(in Chinese))
[20]陈凡秀,张慧新,庄琦.基于DIC的颗粒间接触力计算及力链分析[J].应用力学学报,2015(2):244-250(CHEN Fanxiu,ZHANG Huixin,ZHUANG Qi.The quasi-static response of granular materials to a concentrated loading[J].Chinese Journal of Applied Mechanics,2015(2):244-250(in Chinese))