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考虑级配和颗粒破碎影响的堆石料临界状态研究

蔡正银, 李小梅, 韩林, 关云飞

蔡正银, 李小梅, 韩林, 关云飞. 考虑级配和颗粒破碎影响的堆石料临界状态研究[J]. 岩土工程学报, 2016, 38(8): 1357-1364. DOI: 10.11779/CJGE201608001
引用本文: 蔡正银, 李小梅, 韩林, 关云飞. 考虑级配和颗粒破碎影响的堆石料临界状态研究[J]. 岩土工程学报, 2016, 38(8): 1357-1364. DOI: 10.11779/CJGE201608001
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CAI Zheng-yin, LI Xiao-mei, HAN Lin, GUAN Yun-fei. Critical state of rockfill materials considering particle gradation and breakage[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(8): 1357-1364. DOI: 10.11779/CJGE201608001
Citation: CAI Zheng-yin, LI Xiao-mei, HAN Lin, GUAN Yun-fei. Critical state of rockfill materials considering particle gradation and breakage[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(8): 1357-1364. DOI: 10.11779/CJGE201608001
shu

考虑级配和颗粒破碎影响的堆石料临界状态研究  English Version

  • 1. 南京水利科学研究院岩土工程研究所,江苏 南京 210024; 2. 同济大学地下建筑与工程系,上海 200092; 3. 河海大学力学与材料学院,江苏 南京 210098

基金项目: 国家自然科学基金项目（51179105）
详细信息
    作者简介:

    蔡正银(1965- ),教授级高级工程师,博士生导师,主要从事土的基本性质与土工测试、土的本构理论、构筑物与地基基础离心模拟技术等方面的研究工作。E-mail: zycai@nhri.cn。

  • 中图分类号: 中图分类号

Critical state of rockfill materials considering particle gradation and breakage

  • 1. Department of Geotechnical Engineering, Nanjing Hydraulic Research Institute, Nanjing 210024, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. College of Mechanics and Materials, Hohai University, Nanjing 210098, China

摘要

    摘要
  • 摘要: 临界状态土力学理论在描述细颗粒土应力变形特性方面较为成功,已经成为建立许多黏土和砂土本构模型的基础。对于堆石料,在应力、密度、级配等因素影响下,其变形特性非常复杂,且高应力条件下颗粒易发生破碎,是否存在“唯一”的临界状态值得探讨。通过对不同级配、不同密度的试样在不同围压条件下的一系列大型三轴剪切试验,研究了堆石料的临界状态及其影响因素。研究发现：不同级配、不同密度、不同初始固结应力条件下,当剪应变较大时试样都趋于临界状态,临界状态的值与初始密度、初始级配、颗粒破碎有关;-平面内,堆石料存在唯一的临界应力比M;在-平面内,临界状态线基本平行,其截距可以根据初始密度和初始级配直接求得。通过对比分析各试样的临界状态,提出了考虑级配和颗粒破碎影响的堆石料临界状态数学表达式。
    Abstract: The theories of critical-state soil mechanics are satisfactory in describing the stress-strain characteristics of fine-particle soils and have become the foundation for establishing various constitutive models for clay and sandy soils. As for rockfill materials, under the influences of some factors such as stress, density and gradation, their deformation characteristics are very complex, and their particles are easily broken under high stress. Whether there exists the only critical state or not is worthy of being discussed. Through a series of large-scale triaxial shear tests on rockfill specimens with different gradations and densities under different confining pressures, the critical state of the rockfill materials and the influencing factors are investigated. The test results show that, under different gradations, densities and initial consolidation stresses, when the shear strain is large, the specimens all tend to be in the critical state, and the values of the critical state relate to the initial density, gradation and particle breakage. And in the - plane, there exits the only critical stress ratio M for rockfill materials. Then, in the - plane, the critical state lines are basically parallel, and their intercept can be directly obtained according to the initial density and gradation. A mathematical expression for the critical state of rockfill materials considering particle gradation and breakage is proposed by comparing and analyzing the critical states of various rockfill specimens.
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    • 参考文献(17)
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  • 收稿日期:  2015-08-12
  • 发布日期:  2016-08-24

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