The Brazilian Disc Test for Rock Mechanics Applications: Review and New Insights
The Brazilian Disc Test for Rock Mechanics Applications: Review and New Insights
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岩石力学应用的巴西圆盘测试：回顾和新见解
DOI：
10.1007/s00603-012-0257-7
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发表时间：
2013-03-01
影响因子：
6.2
通讯作者：
Wong, Louis Ngai Yuen
中科院分区：
文献类型：
--
作者：
Li, Diyuan;Wong, Louis Ngai Yuen
本文综述了巴西圆盘间接抗拉强度试验的发展及其在岩石力学中的应用。根据巴西试验的分析，实验和数值方法的研究历史，可以确定三个研究阶段。早期的研究大多集中在巴西圆盘试样的拉应力分布上，而忽略了拉应变分布。巴西圆盘中不同裂纹萌生位置的观测引起了岩石力学界的大量研究兴趣。Stacey（Int J Rock Mech Min Sci Geomech Abstr 18（6）：469-474，1981）提出了一种简单的拉伸应变准则，以解释岩石中拉伸裂纹的萌生和扩展，尽管这并未被广泛使用。在本研究中，一个线弹性数值模型构建研究裂纹萌生在一个50毫米直径的巴西盘使用FLAC（3D）。发现最大拉应力和最大拉应变都发生在沿着圆盘压缩直径距离两个加载点约5 mm处，而不是在圆盘表面的中心。沿着圆盘的压缩直径。因此，当拉应变满足最大延伸应变准则时，岩石巴西试验的裂纹起裂点可能位于加载点附近，而当拉应力满足最大抗拉强度准则时，裂纹起裂点可能位于表面中心。
The development of the Brazilian disc test for determining indirect tensile strength and its applications in rock mechanics are reviewed herein. Based on the history of research on the Brazilian test by analytical, experimental, and numerical approaches, three research stages can be identified. Most of the early studies focused on the tensile stress distribution in Brazilian disc specimens, while ignoring the tensile strain distribution. The observation of different crack initiation positions in the Brazilian disc has drawn a lot of research interest from the rock mechanics community. A simple extension strain criterion was put forward by Stacey (Int J Rock Mech Min Sci Geomech Abstr 18(6):469-474, 1981) to account for extension crack initiation and propagation in rocks, although this is not widely used. In the present study, a linear elastic numerical model is constructed to study crack initiation in a 50-mm-diameter Brazilian disc using FLAC(3D). The maximum tensile stress and the maximum tensile strain are both found to occur about 5 mm away from the two loading points along the compressed diameter of the disc, instead of at the center of the disc surface. Therefore, the crack initiation point of the Brazilian test for rocks may be located near the loading point when the tensile strain meets the maximum extension strain criterion, but at the surface center when the tensile stress meets the maximum tensile strength criterion.