| 基于XCT扫描的砂岩矿物颗粒微尺度变形行为 |
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| 引用本文： | 秦亚光,古德生,胡建华,杨东杰,马少维,白鑫,冯春迪.基于XCT扫描的砂岩矿物颗粒微尺度变形行为[J].中国有色金属学会会刊,2022,32(4):1261-1276. |
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| 作者姓名： | 秦亚光 古德生 胡建华 杨东杰 马少维 白鑫 冯春迪 |
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| 摘 要： | 为了定量表征岩石中三维微结构在单轴压缩下的物理和力学行为,采用高精度原位计算机断层扫描技术研究砂岩矿物颗粒运动、旋转变形和主应变特性,揭示断裂带与非断裂带之间的晶粒行为.结果表明:卸载后,矿物颗粒的剪切应变在径向呈现周期性变化;断裂带和非断裂带区域内部颗粒应变分别约为试样宏观应变的30和5倍;断裂带区域附近的剪切应变大...
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| 关 键 词： | 颗粒变形 原位XCT 失效行为 斯托克斯旋转 物质线 |
| 收稿时间： | 29 October 2020 |
Microscale deformation behavior of sandstone mineral particles based on XCT scanning |
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| Affiliation: | 1. Power China Huadong Engineering Corporation Limited, Hangzhou 311122, China;2. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;3. School of Resources Environment and Safety Engineering, University of South China, Hengyang 421000, China |
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| Abstract: | This work aimed to quantify the physical and mechanical behavior of three-dimensional microstructures in rocks under uniaxial compression. A high-precision in situ XCT (X-ray transmission computed tomography) technology was applied to investigating the behavior of mineral grains in sandstone: the movement, the rotation deformation, and the principal strains between fault zone and non-fault zone. The results indicate that after unloading, the shear strain of mineral grains is periodic in the radial direction, the strain of mineral grains in the fracture zone is about 30 times of the macro strain of the specimen, which is about 5 times in the non-fracture zone, and the shear strain near the fault zone is larger than the compressive strain, and there is the shear stress concentration feature. |
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| Keywords: | grain deformation in situ XCT failure behavior Stokes rotation material line |
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