Exploring the influence of different cooling methods on the pore structure of gneiss using MCT-threshold segmentation method

IF 2.1 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Baofu Kou , Xiao Yang , Zhijiang Zhang , Zhenshun Li
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引用次数: 0

Abstract

Investigating the damage mechanism of rock micro structure after various heating-cooling treatments is crucial for evaluating the stability of an enhanced geothermal system. However, studies on the macro parameters of gneiss in cyclic heating-water cooling are scarce. This study designs a cyclic heating-water cooling test (25–700 °C). It determines the micro pore structure and related parameters (connected pores, porosity, and others) of the post-gneiss using micro-computer tomography (MCT), X-ray diffraction (XRD), and thin section petrographic analysis. In addition, a comparative test of cyclic heating-natural cooling is conducted to obtain the weakening mechanism of the pore structure of gneiss under cyclic heating-water cooling conditions. The findings indicated that the microstructure of gneisses subjected to the two cooling techniques exhibits similar evolutionary characteristics. When the temperature is between 300 and 500 °C, the parameters of gneisses will decrease slightly under natural cooling and increase slightly under water cooling. Due to rapid cooling, more microcracks and thermal damage will form within gneisses under water cooling. Water-induced weakening promotes physicochemical reactions of the internal mineral composition of the rock mass, resulting in great microstructural deterioration of the gneiss under thermal stress.
利用mct阈值分割法探讨不同冷却方式对片麻岩孔隙结构的影响
研究不同冷热处理对岩石微观结构的破坏机理是评价增强型地热系统稳定性的关键。然而,对片麻岩在循环加热-水冷却中的宏观参数研究较少。本研究设计了一个循环加热-水冷却试验(25-700°C)。利用微计算机断层扫描(MCT)、x射线衍射(XRD)和薄片岩相分析确定后片麻岩的微观孔隙结构及相关参数(连通孔隙、孔隙度等)。此外,还进行了循环加热-自然冷却的对比试验,获得了循环加热-水冷却条件下片麻岩孔隙结构的弱化机理。结果表明,两种冷却方式下片麻岩的微观结构具有相似的演化特征。当温度在300 ~ 500℃之间时,片麻岩的参数在自然冷却条件下略有降低,在水冷条件下略有升高。由于冷却速度快,在水冷却下片麻岩内部会形成更多的微裂纹和热损伤。水的弱化作用促进了岩体内部矿物组成的物化反应,导致片麻岩在热应力作用下微观结构的严重变质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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