砂岩高温处理后劣化机理的多尺度实验研究

IF 2.5 4区 工程技术 Q2 ENGINEERING, MECHANICAL
Na Zhang, Yu Song, Yuxin Ren, Piaopiao Zhang, Ziyun Zhang, Shuaidong Wang
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引用次数: 0

摘要

摘要:影响深部工程稳定性的一个重要方面是温度。为了探索高温对砂岩的影响,本研究使用了来自中国陕西的砂岩实验样品。将砂岩样品置于不同的温度梯度(25℃、100℃、300℃、500℃和 700℃)下进行单轴抗压强度(UCS)、声发射(AE)监测和核磁共振(NMR)实验。对不同温度下砂岩的力学参数和孔径分布进行了比较和分析。结果表明砂岩样品的峰值应变和峰值应力都随着加热温度的升高而大幅上升和下降。温度越高,弹性模量和峰值应力的衰减程度也越明显。脆-韧性转变大约发生在 500°C~700°C 之间。温度在 25°C 至 500°C 之间时,峰值 AE 能量出现在砂岩强度峰值附近。温度为 700°C 时,砂岩试样的振铃次数在峰值应力之后达到最大值,加热温度越高,峰值 AE 能量越小。砂岩的 T2 频谱曲线和孔隙率曲线随着处理温度的升高而增大并逐渐右移,T2 频谱面积和孔隙率也逐渐增大。在高温条件下,砂岩的孔隙率和 T2 频谱总面积与峰值应力和弹性模量之间呈负相关。微孔随温度升高呈单调递减趋势
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multi‑scale Experimental Investigations on the Deterioration Mechanism of Sandstone after high-temperature treatment
ABSTRACT: A significant aspect influencing engineering stability in deep engineering is temperature. In order to explore the influence of high temperature on sandstone, This study used experimental samples of sandstone from Shaanxi, China. Sandstone samples were subjected to varying temperature gradients (25℃, 100℃, 300℃, 500℃ and 700℃) for Uniaxial Compressive Strength (UCS), Acoustic Emission (AE) monitoring, and Nuclear Magnetic Resonance (NMR) experiments. The resulting mechanical parameters and pore diameter distributions of the sandstone under various temperatures were compared and analyzed. The results showed that: Peak strain and peak stress of sandstone samples both greatly rise and decrease with increasing heating temperature. The degree of elastic modulus and peak stress degradation is also more pronounced at higher temperatures. The brittle-ductile transition occurs at about occurs between 500°C~700°C. At temperatures between 25°C and 500°C, the peak AE energy occurs near the peak strength of the sandstone. The ringing counts of the sandstone specimens reached a maximum after the peak stress when the temperature was 700°C, and the peak AE energy gradually decreased at higher heating temperatures. The T2 spectrum curve and pore size curve of the sandstone increased and gradually shifted to the right with the increase of the treatment temperature, and the area of the T2 spectrum and porosity also gradually increased. There is a negative correlation between porosity and total area of T2 spectrum and peak stress and elastic modulus of sandstone under high temperature. The micropores showed a monotonically decreasing trend with increasing temperature
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来源期刊
Journal of Porous Media
Journal of Porous Media 工程技术-工程:机械
CiteScore
3.50
自引率
8.70%
发文量
89
审稿时长
12.5 months
期刊介绍: The Journal of Porous Media publishes original full-length research articles (and technical notes) in a wide variety of areas related to porous media studies, such as mathematical modeling, numerical and experimental techniques, industrial and environmental heat and mass transfer, conduction, convection, radiation, particle transport and capillary effects, reactive flows, deformable porous media, biomedical applications, and mechanics of the porous substrate. Emphasis will be given to manuscripts that present novel findings pertinent to these areas. The journal will also consider publication of state-of-the-art reviews. Manuscripts applying known methods to previously solved problems or providing results in the absence of scientific motivation or application will not be accepted. Submitted articles should contribute to the understanding of specific scientific problems or to solution techniques that are useful in applications. Papers that link theory with computational practice to provide insight into the processes are welcome.
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