力学与实践 ›› 2018, Vol. 40 ›› Issue (5): 520-525.DOI: 10.6052/1000-0879-18-115

• 应用研究 • 上一篇    下一篇

变质砂板岩Ⅰ型断裂韧度各向异性初探

李忠洪1, *), 刘建锋, 郑小芳**   

  1. *(重庆化工职业学院建筑工程系,重庆 401228);
    (四川大学水利水电学院,成都 610065);
    **(中国电建集团昆明勘测设计研究院有限公司,昆明 650051)
  • 收稿日期:2018-03-23 出版日期:2018-10-15 发布日期:2018-11-14
  • 通讯作者: 1) 李忠洪, 高级工程师, 主要从事岩石力学与工程领域的教育与研究工作。 E-mail: 28460772@qq.com

THE PRELIMINARY STUDY OF ANISOTROPY OF MODE I FRACTURE TOUGHNESS OF METAMORPHIC SANDY SLATE

LI Zhonghong1, *), LIU Jianfeng, ZHENG Xiaofang**   

  1. *(Chongqing Chemical Engineering Vocational College, Chongqing 401228, China);
    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China);
    **(Kunming Engineering Corporation Limited of PowerChina, Kunming 650051, China)
  • Received:2018-03-23 Online:2018-10-15 Published:2018-11-14

摘要: Ⅰ型断裂韧度是岩石的主要特征力学参数,且影响因素很多。目前,国内可查的细观层理对岩石Ⅰ型断裂韧度影响的相关研究较少。试验利用隧道开挖中的变质砂板岩,测试了横向、纵向和无细观层理砂板岩纵波波速,并采用三点弯曲圆梁方法研究了相应砂板岩试件的Ⅰ型断裂力学性质。试验表明KIC、断裂破坏挠度、细观层理和纵波波速间存在相关关系,根据试验成果提出各向异性系数Y的概念,利用各向异性系数Y计算的K’IC值与实测的相应试件KIC符合较好。

关键词: 变质砂板岩|细观层理|Ⅰ|型断裂韧度|纵波波速

Abstract: The mode I fracture toughness is a main mechanical parameter of rocks, and it is influenced by many factors. The rock's mesoscopic bedding angle is one of the factors, which is not well studied in China. The three-point bending beam (CB) method is used for the metamorphic sandy slate rock obtained in the tunnel excavation, for the mode I rock fracture toughness and the compressional wave velocities of rocks, lateral, longitudinal and without mesoscopic bedding, respectively. It is shown that there is a close correlation between the $K_{\rm IC} $, the fracture damage deflection, the mesoscopic bedding, and the compressional wave velocity. Meanwhile, the concept of anisotropic coefficient Y based on the test results has been proposed, the $K'_{\rm IC}$ calculated by the anisotropic coefficient Y is in good agreement with the $K_{\rm IC} $ measured in the actual test.

Key words: metamorphic sandy slate rock|mesoscopic bedding|mode I rock fracture toughness|compressional wave velocity|anisotropy

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