| 岩石巴西圆盘试验中的空间拉应力分布 |
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| 引用本文： | 喻勇,陈平.岩石巴西圆盘试验中的空间拉应力分布[J].岩土力学,2005,26(12):1913-1916. |
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| 作者姓名： | 喻勇 陈平 |
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| 作者单位： | 1. 西南交通大学 应用力学与工程系，成都 610031；2. 铁道部科学研究院深圳设计研究院，深圳 518034) |
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| 基金项目： | 西南交通大学基础科学研究基金资助项目(No.2004B13)，湖北省环境岩土工程重点实验室开放课题(No.T110401) |
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| 摘 要： | 指出目前人们使用了40多年的岩石巴西圆盘试验拉伸强度公式来自二维弹性力学解答，该公式不适用于实际情况所对应的三维弹性力学问题。为了得到三维条件下试样内部的应力分布规律，采用三维有限元分析软件Marc对试样进行了弹性受力分析，结果表明，试样横截面上的拉应力分布规律与二维条件下的情况相类似，但横截面上的应力值沿试样厚度方向是有变化的，越靠近两端面，水平拉应力越大。分析发现，对于高径比为1、泊松比为0.25的巴西圆盘试样，按二维公式计算的抗拉强度比真实值小23.3 %
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| 关 键 词： | 巴西试验 抗拉强度 三维有限元法 岩石 Marc Matlab |
| 文章编号： | 1000-7598-（2005）12-1913-04 |
| 收稿时间： | 2004-06-09 |
| 修稿时间： | 2004-09-10 |
Spatial distribution of tensile stress in Brazilian disk test of rock |
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| YU Yong,CHEN Ping.Spatial distribution of tensile stress in Brazilian disk test of rock[J].Rock and Soil Mechanics,2005,26(12):1913-1916. |
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| Authors: | YU Yong CHEN Ping |
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| Institution: | 1. Department of Applied Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. Shenzhen Research and Design Institute, China Academy of Railway Sciences, Shenzhen 518034, China |
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| Abstract: | The authors pointed out that the formula existed for more than 40 years to calculate the tensile strength of rock in Brazilian test is based on 2D elastic theory; and the formula is not suitable for the practical condition which is a 3D problem. In order to obtain 3D stress distribution within the specimen, we adopted software package Marc to carry out a 3D finite element analysis. It is found that the tensile stress distribution at a cross-section of a solid specimen is similar to that of 2D disk. However, the tensile stress at a cross-section varies with the thickness of the specimen. The nearer the cross-section closes to the end of the specimen, the higher the horizontal tensile stress is. When the height-to-diameter ratio of the specimen is 1 and Poisson’s ratio is 0.25, the tensile strength calculated by the classical 2D solution is 23.3% less than the real value. |
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| Keywords: | Brazilian test tensile strength 3D FEM rock Marc Matlab |
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