东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (10): 1491-1495.DOI: 10.12068/j.issn.1005-3026.2016.10.026

• 资源与土木工程 • 上一篇    下一篇

岩芯饼化机制及应力分析

马天辉1,2, 王龙1,2, 徐涛3, 于群1,2   

  1. (1. 大连理工大学 海岸和近海工程国家重点实验室, 辽宁 大连116023; 2. 大连理工大学 岩石破裂与失稳研究所, 辽宁 大连116024; 3. 东北大学 资源与土木工程学院, 辽宁 沈阳110819)
  • 收稿日期:2015-06-16 修回日期:2015-06-16 出版日期:2016-10-15 发布日期:2016-10-14
  • 通讯作者: 马天辉
  • 作者简介:马天辉(1977-),男,吉林农安人,大连理工大学讲师,博士.
  • 基金资助:
    国家重点基础研究发展计划项目(2014CB047100); 国家自然科学基金委创新研究群体基金资助项目(51421064); 国家自然科学基金资助项目(41572249); 中央高校基本科研业务费专项资金资助项目 (N150102002, L1501004).

Mechanism and Stress Analysis of Rock Core Discing

MA Tian-hui1, 2, WANG Long1, 2, XU Tao3, YU Qun1, 2   

  1. 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116023, China; 2. Institute of Rock Instability and Seismicity Research, Dalian University of Technology, Dalian 116024, China; 3. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2015-06-16 Revised:2015-06-16 Online:2016-10-15 Published:2016-10-14
  • Contact: MA Tian-hui
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摘要: 采用数值模拟方法从不同地应力组合方式入手探究了地应力对岩芯饼化的影响.研究表明:当地应力超过一定值时,出现岩芯饼化现象,即高地应力才会引起岩芯饼化;当径向应力达到35MPa时,岩芯开始出现饼化现象,径向应力是影响岩芯饼化的主要因素,而轴向应力仅使岩芯表面产生局部破坏;径向应力一定的情况下,随着轴向应力的增大,岩芯饼化逐渐减弱;岩芯饼化的形成过程以剪切破坏为主,并伴有少量的拉破坏;岩芯饼化现象的发生是一个复杂的力学过程.

关键词: 岩芯饼化, 径向应力, 轴向应力, 剪切破坏, 拉破坏

Abstract: Numerical simulation method was used to explore the influence of in-situ stress on rock core discing under different stress combinations. The results showed that when the in-situ stress exceeds a certain value, rock core discing occurs. When the radial stress reaches 35MPa, rock core discing occurs, and the radial stress is the main factor that affects rock core discing, while the axial stress only leads to the partial failure on core surface. At the same radial stress, the core discing weakens with the increase of axial stress. The formation process of core discing is mainly dominated by shear failure, accompanied with a little tension failure. Rock core discing is a complex mechanical process.

Key words: rock core discing, radial stress, axial stress, shear failure, tension failure

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