• 全国中文核心期刊
  • 中国科技核心期刊
  • 美国工程索引(EI)收录期刊
  • Scopus数据库收录期刊

粗粒土应力诱发各向异性真三轴试验颗粒流模拟研究

齐阳, 唐新军, 李晓庆

齐阳, 唐新军, 李晓庆. 粗粒土应力诱发各向异性真三轴试验颗粒流模拟研究[J]. 岩土工程学报, 2015, 37(12): 2292-2300. DOI: 10.11779/CJGE201512020
引用本文: 齐阳, 唐新军, 李晓庆. 粗粒土应力诱发各向异性真三轴试验颗粒流模拟研究[J]. 岩土工程学报, 2015, 37(12): 2292-2300. DOI: 10.11779/CJGE201512020
QI Yang, TANG Xin-jun, LI Xiao-qing. Stress-induced anisotropy of coarse-grained soil by true triaxial tests based on PFC[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(12): 2292-2300. DOI: 10.11779/CJGE201512020
Citation: QI Yang, TANG Xin-jun, LI Xiao-qing. Stress-induced anisotropy of coarse-grained soil by true triaxial tests based on PFC[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(12): 2292-2300. DOI: 10.11779/CJGE201512020

粗粒土应力诱发各向异性真三轴试验颗粒流模拟研究  English Version

基金项目: 新疆维吾尔自治区自然科学基金面上项目(2013211A027)
详细信息
    作者简介:

    齐 阳(1988- ),男,硕士研究生,主要从事水利水电工程数值分析研究。E-mail: yqi_qy@163.com。

Stress-induced anisotropy of coarse-grained soil by true triaxial tests based on PFC

  • 摘要: 基于颗粒流基本理论和物理试验结果,通过改进PFC3D程序中的内置代码,生成包含clump颗粒的混合试样以克服纯球体颗粒模拟粗粒土抗剪强度不足的缺陷,模拟粗粒土在真三轴状态下各主应力方向上的单向加荷试验,并从宏观和细观角度分析了复杂应力状态下粗粒土的应力诱发各向异性特征。试验结果显示:复杂应力状态对各向异性的诱发作用显著,各向宏、细观参数及应力-应变曲线显示出了显著的各向异性;单向加荷试验中加荷向始终为压缩变形,侧向变形复杂,且受初始中主应力系数B影响显著,且B值对非加载向泊松比的各向异性及加载向应力-应变曲线的影响亦较明显;模拟试验中配位数、孔隙率等细观参数的变化趋势能够反映试样体积变形的类型,两个细观参数的取值大小影响抗剪强度的强弱,并且各主应力方向单向加荷时,对应相同的应力增量配位数、孔隙率等细观参数表现出显著的各向异性;从细观角度看,应力诱发各向异性产生的原因归结于侧向围压差异所引起的细观结构变化。
    Abstract: Based on the results of laboratory tests on coarse-grained soil and the theory of three-dimensional particle flow code, a numerical model for true triaxial tests is obtained with mixed particles containing Clump particle. The Clump particle is generated with the tool of PFC and improvement of program code, to solve the insufficient shear strength problem on simulation of coarse grained soil by balls. A series of unilateral loading tests based on the PFC are performed, and the characteristics of complex stress-induced anisotropy of coarse-grained soil are studied from the macro-micro angle. The results indicate that the significant anisotropy showed by the macro parameters, meso parameters and stress-strain curves in the direction of three principal stresses is mainly induced by complex stress state. The deformation in the loading direction is compressive one in all cases, while the deformations in the other two lateral directions are complicated and greatly influenced by the value of B. Moreover, both the anisotropy of Poisson’s ratio and the stress-strain curve in the direction of a certain principal stress are easily affected by the value of B. In a mesoscopic view, the micro parameters in the direction of each principal stress like coordination number or porosity are very different, and their change trend can reflect the type of deformation and their values have a strong influence on the peak strength. It is also shown that the anisotropy of coarse-grained soil is due to the microstructure change caused by confining pressure difference.
  • [1] 张坤勇, 殷宗泽. 复杂应力条件下土体各向异性及其建 模思路[J]. 岩土力学, 2007, 28(增刊): 149-153. (ZHANG Kun-yong, YIN Zong-ze. Discussion on soil’s anisotropy under complicated stress state and the study method[J]. Rock and Soil Mechanics, 2007, 28(S0): 149-154. (in Chinese))
    [2] HOSSEININIA E S, MIRGHASEMI A A. Numerical simulation of breakage of two-dimensional polygon-shaped particles using discrete element method[J]. Powder Technology, 2006, 166: 100-112.
    [3] PIERCE M E, CUNDALL P A, VAN HOUt G J, et al. PFC 3D modeling of caved rock under draw[J]. Numerical Modeling in Micromechanics via Particle Methods, 2003: 211-217.
    [4] POTYONDY D O, CUNDALL P A. A bonded-particle model for rock[J]. International Journal of Rock Mechanics & Mining Sciences, 2004, 41: 1329-1364.
    [5] 周 健, 姚志雄, 张 刚. 砂土渗流过程的细观数值模拟[J]. 岩土工程学报, 2007, 29(7): 977-981. (ZHOU Jian, YAO Zhi-xiong, ZHANG Gang. Mesomechanical simulation of seepage flow in sandy soil[J]. Chinese Journal of Geotechnical Engineering, 2007, 29(7): 977-981. (in Chinese))
    [6] 邓益兵, 周 健, 刘文白, 等. 螺旋挤土桩下旋成孔过程的颗粒流数值模拟[J]. 岩土工程学报, 2011, 33(9): 1391-1398. (DENG Yi-bing, ZHOU Jian, LIU Wen-bai, et al. PFC numerical simulation of augered piling of soil displacement screw piles[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(9): 1391-1398. (in Chinese))
    [7] 司马军, 蒋明镜, 周创兵. 黏性土干缩开裂过程离散元数值模拟[J]. 岩土工程学报, 2013, 35(增刊2): 286-291. (SIMA Jun, JIANG Ming-jing, ZHOU Chuang-bing. Numerical simulation of desiccation cracking of clay soils by DEM[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(S2): 286-291. (in Chinese))
    [8] 蒋明镜, 彭 镝, 申志福, 等. 深海能源土剪切带形成机理离散元分析[J]. 岩土工程学报, 2014, 36(9): 1624-1630. (JIANG Ming-jing, PENG Di, SHEN Zhi-fu, et al. DEM analysis on formation of shear band of methane hydrate bearing soils[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(9): 1624-1630. (in Chinese))
    [9] 杨 贵, 肖 杨, 高德清. 粗粒料三维颗粒流数值模拟及其破 坏准则研究[J]. 岩土力学, 2010, 31(增刊2): 402-405. (YANG Gui, XIAO Yang, GAO De-qing. Study of three-dimensional particle flow numerical simulation and failure criterion for coarse-grained soils[J]. Rock and Soil Mechanics, 2010, 31(S2): 402-405. (in Chinese))
    [10] 周 伟, 谢婷蜓, 马 刚, 等. 基于颗粒流程序的真三轴应力状态下堆石体的变形和强度特性研究[J]. 岩土力学, 2012, 33(10): 3006-3012. (ZHOU Wei, XIE Ting-ting, MA Gang, et al. Stress and deformation analysis of rockfill in true triaxial stress conditions based on PFC[J]. Rock and Soil Mechanics, 2012, 33(10): 3006-3012. (in Chinese))
    [11] 蒋明镜, 李秀梅, 孙渝刚, 等. 考虑颗粒抗转动的砂土双轴试验离散元模拟[J]. 岩土力学, 2009, 30(增刊2): 514-517. (JIANG Ming-jing, LI Xiu-mei, SUN Yu-gang, et al. Discrete element simulation of biaxial compression test considering rolling resistance[J]. Rock and Soil Mechanics, 2009, 30(S2): 514-517. (in Chinese))
    [12] 刘一鸣, 杨春和, 霍永胜, 等. 考虑转动阻抗的粗粒土离散元模拟[J]. 岩土力学, 2013, 34(增刊1): 486-493. (LIU Yi-ming, YANG Chun-he, HUO Yong-sheng, et al. Discrete element modeling of behaviors of coarse grained soils considering rolling resistance[J]. Rock and Soil Mechanics, 2013, 34(S1): 486-493. (in Chinese))
    [13] 施维成, 朱俊高, 刘汉龙. 粗粒土应力诱导各向异性真 三轴试验研究[J]. 岩土工程学报,2008, 30(10): 810-814. (SHI Wei-cheng, ZHU Jun-gao, LIU han-long. Stress-induced anisotropy of coarse-grained soil by true triaxial tests[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(10): 810-814. (in Chinese))
    [14] 施维成. 粗粒土真三轴试验与本构模型研究[D]. 南京: 河海大学, 2008. (SHI Wei-cheng. True triaxial tests on coarse-grained soils and study on constitutive model[D]. Nanjing: Hohai University, 2008. (in Chinese))
    [15] 张坤勇, 殷宗泽, 梅国雄. 土体各向异性研究进展[J]. 岩土力学, 2004, 25(9): 1503-1509. (ZHANG Kun-yong, YIN Zong-ze, MEI Guo-xiong. Development of soil’s anisotropy study[J]. Rock and Soil Mechanics, 2004, 25(9): 1503-1509. (in Chinese))
  • 期刊类型引用(2)

    1. 杜闯,高启辉,宋帅. 地震波斜入射下港珠澳大桥沉管隧道地震响应分析. 河北工业大学学报. 2024(03): 76-86 . 百度学术
    2. 邓捷程,吕龙,孙海忠,吕玺琳. 基于等效线性土体模型的地基与结构整体地震响应模拟. 结构工程师. 2023(03): 85-91 . 百度学术

    其他类型引用(0)

计量
  • 文章访问数:  373
  • HTML全文浏览量:  21
  • PDF下载量:  496
  • 被引次数: 2
出版历程
  • 收稿日期:  2014-09-27
  • 发布日期:  2015-12-19

目录

    /

    返回文章
    返回