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冰川冻土 ›› 2020, Vol. 42 ›› Issue (4): 1275-1284.doi: 10.7522/j.issn.1000-0240.2019.0083

• 寒区工程与灾害 • 上一篇    下一篇

冻结裂隙煤岩单轴压缩破坏机制及细观参数反演

史昌盛1,2(), 李双洋2(), 石梁宏2, 王冲3   

  1. 1.中国铁建股份有限公司, 北京 100855
    2.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
    3.兰州大学 土木工程与力学学院, 甘肃 兰州 730000
  • 收稿日期:2018-12-26 修回日期:2019-05-18 出版日期:2020-12-31 发布日期:2019-05-18
  • 通讯作者: 李双洋 E-mail:shichangsheng@crcc.cn;lisy@lzb.ac.cn
  • 作者简介:史昌盛(1979 - ), 男, 山西祁县人, 高级工程师, 2005年在兰州交通大学获硕士学位, 从事岩土与地下工程研究. E-mail:shichangsheng@crcc.cn
  • 基金资助:
    国家重点研发计划项目(2018YFC0808401);国家自然科学基金项目(41672315);中国科学院“西部之光”项目(李双洋);中国科学院青年创新促进会项目(2015349);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)

Failure mechanisms under uniaxial compression and microscopic parameter inversion of frozen fractured coal rock

Changsheng SHI1,2(), Shuangyang LI2(), Lianghong SHI2, Chong WANG3   

  1. 1.China Railway Construction Corporation Limited, Beijing 100855, China
    2.State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
    3.School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China
  • Received:2018-12-26 Revised:2019-05-18 Online:2020-12-31 Published:2019-05-18
  • Contact: Shuangyang LI E-mail:shichangsheng@crcc.cn;lisy@lzb.ac.cn

摘要:

煤岩的变形破坏是一个复杂的渐进演化过程, 为了研究冻结条件下裂隙煤岩的破坏机理, 基于CT扫描图像, 应用三维离散元模拟方法, 建立了冻结裂隙煤岩的单轴压缩模型。对比分析数值试验与室内压缩试验得到的应力-应变曲线, 发现二者吻合较好。通过对数值模拟结果的系统分析, 得到了冻结裂隙煤岩的细观结构损伤过程和宏观变形破坏规律, 也发现了煤岩的弹性模量和强度随温度变化的发展规律, 同时给出了煤岩强度和弹性模量与温度的数学关系式。以上研究表明, 离散元模拟方法能够为研究冻结裂隙煤岩的细观损伤演化和宏观破坏变形提供新思路, 可为岩体工程的安全稳定分析提供理论依据和参数基础。

关键词: 冻结裂隙煤岩, 应力-应变关系, 位移, 离散单元法

Abstract:

Deformation and failure of coal rock is a complicated and gradual evolution process. In order to study the failure mechanisms of frozen cracked coal, a uniaxial compression model of frozen cracked coal was established based on CT machine images and using 3-D discrete element method. The numerical stress-strain curves were compared with experimental ones, which showed that there was in good agreement between the numerical and experimental results. Then, the micro-structure damage and failure processes of the cracked coal were analyzed. Simultaneously, the development law and mathematical relationship between the strength and elastic modulus of coal rock and temperature was obtained. Through above studies, a new idea is found to analyze damage failure of frozen cracked coal by discrete element method. The idea and method in this study may be useful for studying other discrete materials.

Key words: frozen fractured coal rock, stress-strain relation, displacement, discrete element method

中图分类号: 

  • TD313