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岩芯饼化机制及应力分析
引用本文:马天辉,王龙,徐涛,于群.岩芯饼化机制及应力分析[J].东北大学学报(自然科学版),2016,37(10):1491-1495.
作者姓名:马天辉  王龙  徐涛  于群
作者单位:(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)
基金项目: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).
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35 MPa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  

Mechanism and Stress Analysis of Rock Core Discing
MA Tian-hui,WANG Long,XU Tao,YU Qun.Mechanism and Stress Analysis of Rock Core Discing[J].Journal of Northeastern University(Natural Science),2016,37(10):1491-1495.
Authors:MA Tian-hui  WANG Long  XU Tao  YU Qun
Institution: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.
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.
Keywords:rock core discing  radial stress  axial stress  shear failure  tension failure  
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