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...
工程力学  2013 

含裂纹夹杂多孔材料的渗透性理论与数值分析

DOI: 10.6052/j.issn.1000-4750.2011.11.0753, PP. 150-156

Keywords: 多孔介质,裂纹夹杂,渗透性,有效介质理论,相互作用直推解

Full-Text   Cite this paper   Add to My Lib

Abstract:

多孔材料的裂纹网络对宏观渗透性的影响显著,正确描述裂纹网络对材料渗透率的影响具有重要的工程意义。该文将开裂多孔材料视作由多孔基体和裂纹夹杂二相组成的复合材料,基于细观力学理论模型中的相互作用直推法(IDD)给出了渗透率张量的IDD理论解。为分析裂纹长度、密度、取向、间距和连通度等裂纹网络细观形貌参数对宏观渗透率的影响,该文使用具有周期结构的重复单元模型建立了二维数值分析模型,采用有限单元法进行数值求解并与IDD理论解进行了对比验证。理论研究表明,IDD理论模型采用单一的开裂密度指标来表征多孔介质的裂纹网络,在开裂密度不大时能够统一地描述裂纹长度、取向、平均横向间距和纵向间距等多个细观形貌指标对材料整体渗透性能的影响,具有良好的适用性和精度;数值分析表明,在裂纹网络的密度不断增大、裂纹相互趋近并最终连通的过程中,IDD理论解逐渐偏离数值解并低估裂纹间相互作用,此时材料渗透率与裂纹密度呈对数关系;网络裂纹一旦连通,整体渗透率则发生突变,此时渗透率的确定需要特别考虑连通裂纹之间的强烈近场相互作用。

References

[1]  Dietrich P, Helmig R, Sauter M,et al. , Flow and transport in fractured porous media [M]. New York: Springer, 2005:24―27.
[2]  Reinhardt H W, Hearn N, Sosoro M. Penetration and permeability of concrete: barriers to organic and contaminating liquids: state-of-the-art report [R]. RILEM Technical Committee 146-TCF, Taylor &Francis, 1997:265―324.
[3]  Ismail M, Gagne R, Francois R,et al. Measurement and modeling of gas transfer in cracked mortars [J]. Materials and Structures, 2006,39(1):43―52.
[4]  Wang K, Jansen D C, Shah S P,et al. Permeability study of cracked concrete [J]. Cement and Concrete Research, 1997,27(3):381―393.
[5]  Ismail M, Toumi A, Francois R,et al. Effect of crack opening on the local diffusion of chloride in cracked mortar samples [J]. Cement and Concrete Research, 2008,38(8):1106―1111.
[6]  Djerbi A, Bonnet S, Khelidj A,et al. Influence of traversing crack on chloride diffusion into concrete [J]. Cement and Concrete Research, 2008,38(6):877―883.
[7]  王晓梅),(李克非). 水泥基材料裂隙表面离子吸附过程[J]. (硅酸盐学报), 2011,39(1):1―6. Wang Xiaomei, Li Kefei. Adsorption behavior of ions on fracture surfaces of cement-based materials [J]. Journal of the Chinese Ceramic Society,2011,39(1): 1―6. (in Chinese
[8]  王晓梅),(李克非). 水泥基材料裂隙表面溶蚀过程[J]. (硅酸盐学报), 2011,39(3):525―530. Wang Xiaomei, Li Kefei. Leaching behavior of fracture surfaces of cement-based materials [J]. Journal of the Chinese Ceramic Society,2011,39(3): 525―530. (in Chinese
[9]  Hoxha D, Homand F. Microstructural approach in damage modeling [J]. Mechanics of Materials, 2000,32(4):377―387.
[10]  Snow D T. Anisotropic permeability of fractured media [J]. Water Resources Research, 1969,5(6):1273―1289.
[11]  Oda M. Permeability tensor for discontinuous rock masses [J]. Geo-Technique, 1985,35(4):483―495.
[12]  周建军),(周辉),(邵建富). 脆性岩石各向异性损伤和渗流耦合细观模型[J]. (岩石力学与工程学报), 2007,26(2):368―373. Zhou Jianjun, Zhou Hui, Shao Jianfu. Coupled micromechanical model for anisotropic damage and permeability variation in brittle rocks [J]. Chinese Journal of Rock Mechanics and Engineering,2007,26(2): 368―373. (in Chinese
[13]  Mouton P RPrinciples and practices of unbiased stereology: An introduction for bioscientists [M]. Baltimore: Johns Hopkins University Press, 2002: 1―6.
[14]  Ringot E, Bascoul A. About the analysis of micro-cracking in concrete [J]. Cement and Concrete Composites, 2001,23(2):261―266.
[15]  Litorowicz A. Identification and quantification of cracks in concrete by optical fluorescent microscopy [J]. Cement and Concrete Research, 2006,36(8):1508―1515.
[16]  Hashin Z. Assessment of the self-consistent scheme approximation: conductivity of particulate composites [J]. Journal of Composite Materials, 1968,2(3):284―300.
[17]  Zheng Q S, Du D X. An explicit and universally applicable estimate for the effective properties of multiphase composites which accounts for inclusion distribution [J]. Journal of the Mechanics and Physics of Solid, 2001,49(11):2765―2788.
[18]  Du D X, Zheng Q S. A further exploration of the interaction direct derivative (IDD) estimate for the effective properties of multiphase composites taking into account inclusion distribution [J]. Acta Mechanics, 2002,157(1):61―80.
[19]  Shafiro B, Kachanov M. Anisotropic effective conductivity of materials with non-randomly oriented inclusions of diverse ellipsoidal shapes [J]. Journal of Applied Physics, 2000,87(12):8561―8569.
[20]  Huang Y, Hu K X. Chandra A. A generalized self- consistent mechanics method for micro-cracked solids [J]. Journal of the Mechanics and Physics of Solids, 1994,42(8):1273―1291.
[21]  Zhou C S, Li K F. Pang X Y. Effect of crack density and connectivity on the permeability of micro-cracked solids [J]. Mechanics of Materials, 2012,43(12):969―978.
[22]  Zhou C S, Li K F. Numerical and statistical analysis of permeability of concrete as a random heterogeneous composite [J]. Computers and Concrete, 2010,7(5):469―482.
[23]  Picandet V, Khelidj A, Bastian G. Effect of axial compressive damage on gas permeability of ordinary and high-performance concrete [J]. Cement and Concrete Research, 2001,31(11):1525―1532.
[24]  Drago A, Pindera M J. Micro-macro-mechanical analysis of heterogeneous materials: Macroscopically homogeneous vs. periodic microstructure [J]. Composites Science and Technology, 2007,67(6):1243―1363.
[25]  周春圣). 考虑裂纹网络的混凝土多相材料渗透性的理论与试验研究[D]. 北京: 清华大学, 2011.
[26]  Zhou Chunsheng. Theoretical and experimental study on permeability of concrete incorporating cracks network [D]. Beijing: Tsinghua University, 2011.(in Chinese)
[27]  Keller J B. Conductivity of a medium containing a dense array of perfectly conducting spheres or cylinders or non-conducting cylinders [J]. Journal of Applied Physics, 1963,34(4):991―993.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133