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脆性岩石蠕变裂纹成核宏细观力学机理研究

李晓照 贾亚星 张骐烁 戚承志

李晓照, 贾亚星, 张骐烁, 戚承志. 脆性岩石蠕变裂纹成核宏细观力学机理研究[J]. 力学学报, 2021, 53(4): 1059-1069. doi: 10.6052/0459-1879-20-400
引用本文: 李晓照, 贾亚星, 张骐烁, 戚承志. 脆性岩石蠕变裂纹成核宏细观力学机理研究[J]. 力学学报, 2021, 53(4): 1059-1069. doi: 10.6052/0459-1879-20-400
Li Xiaozhao, Jia Yaxing, Zhang Qishuo, Qi Chengzhi. A STUDY ON MICRO-MACRO MECHANISMS OF CRACK NUCLEATION DURING CREEP IN BRITTLE ROCKS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(4): 1059-1069. doi: 10.6052/0459-1879-20-400
Citation: Li Xiaozhao, Jia Yaxing, Zhang Qishuo, Qi Chengzhi. A STUDY ON MICRO-MACRO MECHANISMS OF CRACK NUCLEATION DURING CREEP IN BRITTLE ROCKS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(4): 1059-1069. doi: 10.6052/0459-1879-20-400

脆性岩石蠕变裂纹成核宏细观力学机理研究

doi: 10.6052/0459-1879-20-400
基金项目: 1)国家自然科学基金(51708016);北京市教委科研计划(KM202110016014);北京建筑大学金字塔人才培养工程(JDYC20200307)
详细信息
    作者简介:

    2)李晓照, 副教授, 主要研究方向: 岩石力学与工程方面的研究工作. E-mail: lixiaozhao@bucea.edu.cn

    通讯作者:

    李晓照

  • 中图分类号: TU452

A STUDY ON MICRO-MACRO MECHANISMS OF CRACK NUCLEATION DURING CREEP IN BRITTLE ROCKS

  • 摘要: 脆性岩石内部细观裂纹扩展、贯通及成核影响下的脆性蠕变行为, 对深部地下工程围岩微震及岩爆事件评价有着重要意义. 然而, 目前能够解释裂纹成核损伤突变影响下, 脆性岩石完整蠕变宏细观力学机理模型的研究很少. 本文基于脆性岩石亚临界裂纹扩展模型、裂纹-应变-声发射事件相关的损伤模型及裂纹成核损伤时间演化路径函数, 提出了一种脆性岩石裂纹成核损伤突变影响下的蠕变宏细观力学模型. 裂纹成核损伤时间演化路径函数通过岩石内部裂纹成核损伤突变大小$\Delta D_{CN}$及相邻裂纹成核损伤时间差$\Delta t$进行定义, 该函数可以结合岩石声发射监测试验数据定义的岩石损伤数据确定. 通过与试验结果对比分析验证模型的合理性. 并讨论了裂纹成核损伤大小、相邻裂纹成核损伤时间间隔、及裂纹成核数量对脆性岩蠕变裂纹长度、裂纹速率、轴向应变及应变率的影响. 该结果对于更加合理、经济、高效的深部地下工程施工及设计提供了一定的理论支持.

     

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  • 收稿日期:  2020-11-27
  • 刊出日期:  2021-04-10

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