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冰川冻土 ›› 2017, Vol. 39 ›› Issue (4): 858-867.doi: 10.7522/j.issn.1000-0240.2017.0096

• 寒区科学与技术 • 上一篇    下一篇

不同围压下冻结黄土胶结行为的离散元分析

尹楠1,2, 李双洋3, 施烨辉1, 孙志忠3, 尹振华3,4   

  1. 1. 江苏省隧道与地下工程技术研究中心, 江苏 南京 210041;
    2. 南京坤拓土木工程科技有限公司, 江苏 南京 210041;
    3. 中国科学院 西北生态环境资源研究院 冻土工程国家重点实验室, 甘肃 兰州 730000;
    4. 中国科学院大学, 北京 100049
  • 收稿日期:2016-12-28 修回日期:2017-06-28 出版日期:2017-08-25 发布日期:2017-11-15
  • 通讯作者: 李双洋,E-mail:lisy@lzb.ac.cn E-mail:lisy@lzb.ac.cn
  • 作者简介:尹楠(1989-),男,江苏徐州人,工程师,2016年在中国科学院寒区旱区环境与工程研究所获硕士学位,从事寒区工程数值仿真研究.E-mail:yin_nan@yeah.net
  • 基金资助:
    国家自然科学基金项目(41672315;41230630);江苏省地质矿产局科技基金项目(2013-ky-2);中国科学院前沿科学重点研究项目(QYZDY-SSW-DQC015);中国科学院“西部之光”(李双洋);中国科学院“百人计划”(张明义);中国科学院青年创新促进会(李双洋);冻土工程国家重点实验室自主研究课题(SKLFSE-ZY-18);中国科学院STS项目(HHS-TSS-STS-1502)资助

Discrete element analysis of cemented behavior of frozen loess under different confining pressures

YIN Nan1,2, LI Shuangyang3, SHI Yehui1, SUN Zhizhong3, YIN Zhenhua3,4   

  1. 1. Tunnel and Underground Engineering Research Center of Jiangsu Province, Nanjing 210041, China;
    2. Kuntuo Civil Engineering Technology Co., Ltd. of Nanjing, Nanjing 210041, China;
    3. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    4. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-12-28 Revised:2017-06-28 Online:2017-08-25 Published:2017-11-15

摘要: 鉴于冻土中冰的胶结作用在冻土力学性质方面的重要作用,在三维离散元法中,采用黏结发生在有限范围内的模型来考虑冰的胶结作用,对不同围压下冻结黄土的胶结行为进行了数值研究。结果表明:数值模拟的应力-应变曲线与试验数据吻和较好;颗粒接触刚度、平行黏结刚度和强度均随着围压增大而线性增大,但摩擦系数随围压增大而减小;力链、位移和孔隙率与围压的响应关系呈现出统一性。同时,也分析了冰胶结作用影响下的冻土细观变化与宏观力学行为之间的响应关系。这对于促进离散元法在冻土领域内的应用具有积极的作用。

关键词: 三维离散元法, 冰胶结, 不同围压, 胶结行为

Abstract: The cementation of ice makes a significant impact on mechanical properties of the frozen soil, so a bonding model which is effective in a limited range is used to simulate this cementation. Based on three-dimensional discrete element method (DEM) of particle flow code, a numerical research on cemented behavior of frozen loess under different confining pressures is carried out. The results show that simulated stress-strain relationships agree well with experimental data. Particle stiffness, parallel bond stiffness and strength all linearly increase with confining pressures, but friction coefficient shows an opposite tendency. Contact force chains, displacements and porosities exhibit a unity with the response of confining pressures. Meanwhile, the relationship is also analyzed between response of microscopic changes and macroscopic mechanical behavior under the effect of ice cementation. These studies will play an active role in application of DEM to frozen soil field.

Key words: three-dimensional DEM, cementation of ice, different confining pressures, cemented behavior

中图分类号: 

  • P642.14