硬岩压缩过程中泊松比的变化以及基于轴向加载-卸载试验的创新测定方法

IF 2.3 4区 地球科学
Jianan Yang, Pengxian Fan, Hui Gao, Lu Dong
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引用次数: 0

摘要

坚硬岩石的泊松比表现出明显的应力依赖性,这与其作为弹性常数的力学定义背道而驰。因此,通过合理的方法确定泊松比具有重要意义。为了研究多种类型硬岩(砂岩、玄武岩、花岗岩和大理石)的泊松效应,我们进行了单轴加载-卸载试验。试验结果表明,无论是切线泊松比还是平均泊松比,都随着应力水平的增加而逐渐增大。而平均泊松比在卸载路径下的应力依赖性降低,这在中低应力区间表现明显。适当增加加载-卸载循环次数也能在一定程度上提高平均泊松比的稳定性。在此基础上,提出了一种测试平均泊松比的新方法,它能有效排除岩石不可逆位移的影响,提高平均泊松比的稳定性。该测试程序简单,具有良好的应用前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Variation of Poisson’s ratio of hard rocks during compression and an innovative determination method based on axial loading–unloading test

Variation of Poisson’s ratio of hard rocks during compression and an innovative determination method based on axial loading–unloading test

The Poisson’s ratio of hard rock exhibits a marked stress dependence, which is contrary to its mechanical definition as an elastic constant. Thus, it is of great importance to determine the Poisson’s ratio through a reasonable method. To investigate the Poisson effect of multiple types of hard rocks (sandstone, basalt, granite, and marble), the uniaxial loading–unloading tests are carried out. The test results indicate that whether the tangent Poisson’s ratio or the average Poisson’s ratio, all gradually increases with the stress level. And the stress dependence of the average Poisson’s ratio under the unloading path is reduced, which is significant in the low and medium stress intervals. Appropriately increasing the number of loading–unloading cycles can also improve the stability of the average Poisson’s ratio to some extent. Based on this, a new method for testing the average Poisson’s ratio is proposed, which can effectively exclude the effect of irreversible displacement of rocks and improve the stability of the average Poisson’s ratio. The test procedure is simple and has good application prospects.

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来源期刊
Acta Geophysica
Acta Geophysica GEOCHEMISTRY & GEOPHYSICS-
CiteScore
3.80
自引率
13.00%
发文量
251
期刊介绍: Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.
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