期刊文献+

结构性砂土胶结厚度分布特性试验研究 被引量:5

Experimental and Numerical Research on Bonding Properties of Structured Sand
下载PDF
导出
摘要 颗粒间胶结物厚度对胶结颗粒接触力学特性有显著影响,进而影响结构性砂土离散元模拟结果。为更好地模拟天然砂土的结构性,需要明晰结构性砂土中颗粒间胶结厚度分布特性,并且能在离散元模拟中反映该分布特性。本文采用人工制备结构性砂土,开展电镜扫描试验,对结构性砂土中颗粒间胶结厚度分布特性进行了研究。研究结果表明:在结构性砂土中,随着水泥含量的增加,平均胶结厚度近似线性增加;但是水泥含量对胶结厚度的概率分布规律影响不大,水泥含量不同的结构性砂土,其颗粒间胶结厚度概率分布均为先线性增大,后指数型衰减。在试验研究结果的基础上,提出了离散元模拟结构性砂土胶结厚度的方法,可以较好地反映结构性砂土中颗粒间胶结厚度指数型衰减的分布特性。 The bonding thickness plays an important role in the mechanical behaviors of the inter-particle bonding,and then significantly influences the simulations of structured sands using DEM. So it’s necessary to get a better understanding of the distribution of inter-particle bonding thickness and take it into account in the DEM simulations. The distribution of inter-particle bonding thickness is experimentally studied by performing SEM on the artificially structured sands. The results show that the average bonding thickness increases almost linearly with the increasing cement content. However,the cement content only slightly influences the probability distribution of inter-particle bonding thickness. There is an exponential decrease in the probability distribution after its initial linear increase with bonding thickness. A method simulating the bonding thickness in DEM,which can capture the exponential decrease of the probability distribution of bonding thickness,is proposed based on the experimental results.
出处 《地下空间与工程学报》 CSCD 北大核心 2016年第2期362-368,共7页 Chinese Journal of Underground Space and Engineering
基金 国家杰出青年科学基金(51025932) 教育部博士点基金(20100072110048) 长江学者及创新团队发展计划资助(IRT1029)
关键词 结构性砂土 胶结分布特性 扫描电子显微镜 离散单元法 structured sand distribution of bonding thickness scanning electron microscope discrete element method
  • 相关文献

参考文献24

  • 1蒋明镜,孙渝刚.结构性砂土粒间胶结效应的二维数值分析[J].岩土工程学报,2011,33(8):1246-1253. 被引量:14
  • 2蒋明镜,孙渝刚.人工胶结砂土力学特性的离散元模拟[J].岩土力学,2011,32(6):1849-1856. 被引量:19
  • 3Wang Y H, Leung S C. A particulate-scale investigation of cemented sand behavior [ J ]. Canadian Geoteehnical Joumal, 2008, 45 (1) : 29-44.
  • 4Wang Y H, Leung S C. Characterization of cemented sand by experimental and numerical investigations [ J ]. Journal of Geotechnieal and Geoenvironmental En- gineering, 2008, 134(7): 992-1004.
  • 5Oda M, Iwashita K. Study on couple stress and shear band development in granular media based on numerical simulation analyses [ J ]. International Journal of Engi- neering Science, 2000, 38(15) : 1713-1740.
  • 6Lnding S. Micro-macro transition for anisotropie, frictional granular packings [ J ]. International Journal of Solids and Structures, 2004, 41 (21) : 5821-5836.
  • 7Luding S, Alonso-Marroquin F. The critical-state yield stress (terminaion locus ) of adhesive powders from a single numerical experiment [ J ]. Granular Matter, 2011, 13(2): 109-119.
  • 8Kuhn M R, Bagi K. Contact rolling and deformation in granular media [ J ]. International Journal of Solids and Structures, 2004, 41(21): 5793-5820.
  • 9Kruyt N P, Rothenburg L. Statistical theories for the e- lastic moduli of two-dimensional assemblies of granular materials[ J ]. International Journal of Engineering Sci- ence, 1998, 36(10): 1127-1142.
  • 10Jiang M J, Zhu H H, Li X M. Strain localization analyses of idealized sands in biaxial tests by distinct el- ement method [ J]. Frontiers of Architecture and Civil Engineering in China, 2010, 4(2) : 208-222.

二级参考文献67

  • 1沈珠江.土体结构性的数学模型──21世纪土力学的核心问题[J].岩土工程学报,1996,18(1):95-97. 被引量:421
  • 2刘恩龙,沈珠江.结构性土强度准则探讨[J].工程力学,2007,24(2):50-55. 被引量:16
  • 3刘恩龙,沈珠江.人工制备结构性土力学特性试验研究[J].岩土力学,2007,28(4):679-683. 被引量:39
  • 4WANG Y H, LEUNG S C. A particulate scale investigation of cemented sand behaviour[J]. Canadian Geotechnical Journal, 2008, 45(1): 29-44.
  • 5BURLAND J B. On the compressibility and shear strength of natural clays[J]. G6otechnique, 1990, 40(3): 329-378.
  • 6LEROUEIL S, VAUGHAN P R. The general and congruent effects of structure in natural soils and weak rocks[J]. G6otechnique, 1990, 40(3): 467-488.
  • 7ISMAIL M A, JOER H A, SIM W H, et al. Effect of cement type on shear behavior of cemented calcareous soil[J]. Journal of Geoteehnical and Geoenvironmental Engineering, 2002, 128(6): 520-529.
  • 8NOVA R, CASTELLANZA R, TAMAGNINI C. A constitutive model for bonded geomaterials subject to mechanical and/or chemical degradation[J]. Inter- national Journal for Numerical and Analytical Methods in Geomechanics, 2003, 27(9): 705-732.
  • 9CUNDALL P A, STRACK O D L. The discrete numerical model for granular assemblies[J]. Geotechnique, 1979, 29(1): 47-65.
  • 10JIANG M J, YU H S, LEROUEIL S. A simple and efficient approach to capturing bonding effect in natural sands by discrete element method[J]. International Journal for Numerical Methods in Engineering, 2007, 69(6): 1158- 1193.

共引文献58

同被引文献94

引证文献5

二级引证文献134

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部