真三维压缩条件下端面效应对岩石力学行为的实验研究

IF 3.5 3区 工程技术 Q3 ENERGY & FUELS Energy Science & Engineering Pub Date : 2024-08-09 DOI:10.1002/ese3.1856
Junchao Chen, Zhenglu Che, Meiben Gao, Liang Zhang, Zhonghui Shen
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引用次数: 0

摘要

在真正的三轴压缩试验中,所有三个主应力都是独立施加的。这样可以更全面地分析材料的机械性能。真三轴压缩试验中的末端效应是影响试验结果准确性和可靠性的关键现象。在本研究中,我们进行了一系列真三轴压缩试验,以考察端面摩擦对机械性能的影响。实验室结果表明,端面摩擦的存在可明显提高岩石强度,同时也限制了各个方向的变形,表明刚度(曲线斜率)略有增加。当端面摩擦力增加时,岩石强度可从 24.7()增加到 90.7(),这主要是由侧向界面摩擦力引起的。试样的破坏模式和断裂角度也受到端部效应的影响,表明在高摩擦条件下,破坏更具韧性,断裂角度更大。最后,与已公布的实验数据相比,数值确定了真三维试验中试样与金属直接接触的实际比摩擦角(相应的摩擦系数约为 0.19),该比摩擦角在经验上是合理的,且高于从双剪切试验系统中获得的 0.146-0.157 的测试范围。
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Experimental study of the end effect on the mechanical behaviors of rocks under true 3D compressions

In true triaxial compression tests, all three principal stresses are imposed independently. This allows for a more comprehensive analysis of the material's mechanical properties. The end effect in true triaxial compression tests is a crucial phenomenon that impacts the accuracy and reliability of the test results. In this study, a series of true triaxial compression tests is conducted to examine the influence of the end friction on the mechanical properties. The laboratory results show that the presence of the end friction could bring about an apparent increase in rock strength and also restrict the deformation in each direction showing that the stiffness (the slope of the curves) increased slightly. The rock strength σ 1 , peak ${\sigma }_{1,\text{peak}}$ could be enhanced from 24.7 % ( σ 2 = σ 3 ) $ \% \,({\sigma }_{2}={\sigma }_{3})$ to 90.7 % $ \% $ ( σ 2 = σ 1 ${\sigma }_{2}={\sigma }_{1}$ ) when the end friction is increased, which is mainly caused by the lateral interface friction. The failure mode and fracture angle of the specimen are also influenced by the end effect, showing that under high friction conditions, the failure is more ductile, and a larger fracture angle is observed. At last, in comparison with the published experimental data, the actual specific friction angle 11 ° $11^\circ $ (corresponding friction coefficient is about 0.19) for the direct specimen–metal contacts in a true 3D test is numerically identified, which is empirically reasonable and higher than the tested range 0.146–0.157 obtained from double-shear test system.

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来源期刊
Energy Science & Engineering
Energy Science & Engineering Engineering-Safety, Risk, Reliability and Quality
CiteScore
6.80
自引率
7.90%
发文量
298
审稿时长
11 weeks
期刊介绍: Energy Science & Engineering is a peer reviewed, open access journal dedicated to fundamental and applied research on energy and supply and use. Published as a co-operative venture of Wiley and SCI (Society of Chemical Industry), the journal offers authors a fast route to publication and the ability to share their research with the widest possible audience of scientists, professionals and other interested people across the globe. Securing an affordable and low carbon energy supply is a critical challenge of the 21st century and the solutions will require collaboration between scientists and engineers worldwide. This new journal aims to facilitate collaboration and spark innovation in energy research and development. Due to the importance of this topic to society and economic development the journal will give priority to quality research papers that are accessible to a broad readership and discuss sustainable, state-of-the art approaches to shaping the future of energy. This multidisciplinary journal will appeal to all researchers and professionals working in any area of energy in academia, industry or government, including scientists, engineers, consultants, policy-makers, government officials, economists and corporate organisations.
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