岩土力学 ›› 2019, Vol. 40 ›› Issue (4): 1239-1247.doi: 10.16285/j.rsm.2017.2391

• 基础理论与实验研究 •    下一篇

平台巴西圆盘研究综述及三维启裂点研究

吴顺川1, 2,马 骏1,程 业1,成子桥3,李建宇3   

  1. 1. 北京科技大学 金属矿山高效开采与安全教育部重点实验室,北京 100083;2. 昆明理工大学 国土资源工程学院,云南 昆明 650093; 3. 中电建路桥集团有限公司,北京 100048
  • 收稿日期:2017-12-01 出版日期:2019-04-11 发布日期:2019-04-22
  • 作者简介:吴顺川,男,1969年生,博士,教授,博士生导师,主要从事岩土工程、采矿工程等方面的研究工作
  • 基金资助:
    国家自然科学基金项目(No. 51774020)。

Review of the flattened Brazilian test and research on the three dimensional crack initiation point

WU Shun-chuan1, 2, MA Jun1, CHENG Ye1, CHENG Zi-qiao3, LI Jian-yu3   

  1. 1. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science and Technology Beijing, Beijing 100083, China; 2. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; 3. Power China Road Bridge Group Co., Ltd., Beijing 100048, China
  • Received:2017-12-01 Online:2019-04-11 Published:2019-04-22
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51774020).

摘要: 总结了对平台巴西劈裂试验平台中心角的研究,归纳总结了抗拉强度计算公式的修正系数k。通过建立两种平台角的三维有限元模型探究试样内应力分布状态,通过对受压直径所在平面及过平台末端的竖直平面的受力分析,发现Griffith等效应力分布规律会随平台角的改变而改变,且在两种平台角下等效应力最大值均出现在平台边缘处。结合三维离散元方法模拟试验中裂纹开展过程,发现微裂纹最早集中于平台末端,但随着荷载的增加致使试样破裂的裂纹起始于试样中部。有限元的力学分析与离散元的破裂过程模拟可很好地相互印证。通过与试验现象对比发现,加工精度对裂纹模式有着重要影响,为保证由平台巴西劈裂试验测量岩石抗拉强度的有效性,在试样与试验机之间垫入垫片是较为可行的方法。

关键词: 平台巴西劈裂试验, 抗拉强度, 三维有限元, 应力分布, 颗粒流

Abstract: In this study, the effect of the loading angle on the flattened Brazilian test is reviewed and the correction coefficient of the indirect tensile strength formula is summarized. Three dimensional finite element models for the flattened Brazilian disks are established to study the equivalent stress distribution by considering two kinds of loading angles. Based on the Griffith strength criterion, the equivalent stress distribution is affected by the loading angle in terms of stress distribution along loading diameter and flat ends. Moreover, the maximum equivalent stress occurs at edges of the flat ends in both two models. Three dimensional discrete element model is also constructed to study the initiation and propagation of cracks in the flattened Brazilian test. The micro-cracks first concentre at edges of the flat ends. However, macro-cracks, which will lead to the final failure of the specimen, initiate at the central disc. The results from the finite element method and discrete element method can be verified mutually. Compared with experiment phenomena, it is found that the precision of the two flat ends have a significant impact on the fracturing mode. The method of placing shims between the specimen and test machine is feasible to conduct the flattened Brazilian test conveniently.

Key words: the flattened Brazilian test, tensile strength, 3D finite element model, stress distribution, particle flow code

中图分类号: 

  • TU 458
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