单轴压缩下煤岩细观结构参数表征及演化规律

杨琪; 于岩斌; 崔文亭; 高成伟; 张鑫; 申家龙

doi:10.13199/j.cnki.cst.2021-0766

单轴压缩下煤岩细观结构参数表征及演化规律

杨琪^{1, 2,},
于岩斌^{1, 2, ,},
崔文亭^{1, 2},
高成伟^{1, 2},
张鑫^{1, 2},
申家龙^{1, 2}

1.
山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地, 山东青岛　266590
2.
山东科技大学安全与环境工程学院, 山东青岛　266590

基金项目:

国家自然科学基金资助项目（52074171，51934004）；泰山学者工程专项经费资助项目（TS20190935）

详细信息

作者简介:
杨琪: （1997—），女，新疆奎屯人，硕士研究生。E-mail：Qiyang0421@163.com

通讯作者:
于岩斌: （1986—），男，山东乳山人，副教授，博士后。E-mail：yanbinyu@sdust.edu.cn

中图分类号: TU45
计量
- 文章访问数: 179
- HTML全文浏览量: 29
- PDF下载量: 69
出版历程
- 收稿日期: 2021-10-19
- 录用日期: 2022-05-07
- 网络出版日期: 2023-05-10
- 刊出日期: 2023-04-29

Fracture evolution of coal under uniaxial compression based on X-ray microscopic imaging

YANG Qi^{1, 2,},
YU Yanbin^{1, 2, ,},
CUI Wenting^{1, 2},
GAO Chengwei^{1, 2},
ZHANG Xin^{1, 2},
SHEN Jialong^{1, 2}

1.
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
2.
College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Funds:

National Natural Science Foundation of China (52074171,51934004); Taishan Scholars Project Special Fund Project (TS20190935)

摘要

摘要:
为研究煤岩细观结构特征随着轴向应力增加的演化规律，利用NanoVoxel-3502E X射线三维显微镜与Deben原位加载实验台进行煤岩单轴压缩试验，获取不同应变条件下的CT数据，并结合三维可视化软件AVIZO，研究煤样试件的孔隙裂隙分布特征，统计分析煤样试件孔隙裂隙细观参数-球形度、配位数、曲率和开度。揭示了煤样在单轴压缩情况下的细观结构空间分布特征及随时间的展布规律，细观结构随轴向应力的演化规律。研究表明：微小裂隙在20～732 N过程中大量出现，孔隙增多，在431～732 N过程中孔隙球形度集中分布范围变窄，部分孔裂隙逐渐融合进入裂隙网络，部分孔裂隙被压实压密，732 N时部分孔隙被压实压密，导致孔裂隙减少90000个，裂隙曲率逐渐增大、裂隙逐渐开度变大，配位数集中率更高，同时也说明煤样内部连通性更好，732 N是裂隙网络发育的巅峰。轴向力达到1100 N（峰值）时，形成复杂的裂隙网络。随着单轴压缩过程的推进，部分孔裂隙虽然在732 N被压实压密，但由于轴向力的增大以及残余荷载的作用，孔裂隙的增多是必然趋势，峰值和峰后仍然存在微小孔裂隙，但峰后裂隙较窄，球形度更多的是集中在1.5～2.0。贯通裂隙的曲率在裂隙网络的边缘普遍较高，即裂隙网络边缘为裂隙发育带。为研究煤样的时空演化规律提供了一种可行的技术手段，对于阐释煤岩细观结构时空演化过程具有实际意义。
- CT /
- 单轴压缩 /
- 原位测试 /
- 细观结构 /
- 煤结构 /
- 细观结构参数
Abstract:
In order to study the evolution of the microstructure characteristics of coal with increasing axial stress, this paper used NanoVoxel-3502E X-ray three-dimensional microscope and Deben in-situ loading test rig to carry out uniaxial compression tests of coal to obtain CT data under different strain conditions, Combined with the three-dimensional visualization software AVIZO, extracted the pores and fractures of the coal sample, studyed the pore and fracture distribution characteristics of the coal sample, and statistically analyzed the microscopic parameters of the number of pores, sphericity, and coordination number, curvature, thickness and other meso-structure parameters. It revealed the spatial distribution characteristics of the mesostructure of the coal sample under uniaxial compression and its distribution law over time, and the evolution law of the mesostructure with the axial stress. Studies have shown that small fractures appear in large numbers from 20 N to 732 N, and the number of pores increases. During the process from 431 N to 732 N, the concentrated distribution range of pore sphericity became narrower. Some pores and fractures gradually merged into the fracture network, and some pores and fractures were compressed. Part of the pores were compacted at 732 N, resulted in a reduction of 90,000 pores. The curvature of the fractures gradually increased, the fractures gradually became thicker, and the coordination number concentration ratio was higher. It also showed that the coal sample was internally connected. 732 N was the pinnacle of fracture network development. When the axial force reached 1100 N (peak), a complex fracture network was formed. With the advancement of the uniaxial compression process, although some pores and fractures were compacted at 732 N, due to the increase in axial force and residual load, the increase of pores and fractures was an inevitable trend, and there were still small pores and fractures after the peak, but the post-peak fractures were thinner, and the sphericity was more concentrated in 1.5-2.0. The curvature of the interconnected fractures was generally higher at the edges of the fracture network, the edges of the fracture network were fracture development zones. This paper provided a feasible technical means for studying the temporal and spatial evolution of coal samples, and has practical significance for interpreting the temporal and spatial evolution of the meso-structure of coal.
- CT /
- uniaxial compression /
- in-situ tests /
- mesoscopic structure /
- coal /
- fracture evolution of coal

HTML全文

图 1 X射线三维扫描成像原理及二维切片展示

Figure 1. X-ray three-dimensional scanning imaging principle and two-dimensional section presentation

下载: 全尺寸图片幻灯片

图 2 煤样地理位置

Figure 2. Geographical location of coal sample

下载: 全尺寸图片幻灯片

图 3 原位加载试验路径

Figure 3. In-situ loading test path

下载: 全尺寸图片幻灯片

图 4 孔裂隙骨架化

Figure 4. Skeletonizing pore and fracture

下载: 全尺寸图片幻灯片

图 5 球形度散点图

Figure 5. Spherical scatter

下载: 全尺寸图片幻灯片

图 6 配位数

Figure 6. Coordination number

下载: 全尺寸图片幻灯片

图 7 贯通裂隙网格划分

Figure 7. Meshing of through fracture

下载: 全尺寸图片幻灯片

图 8 贯通裂隙曲率展示

Figure 8. Curvature of interconnected fracture

下载: 全尺寸图片幻灯片

图 9 贯通裂隙开度展示

Figure 9. Thickness of interconnected fracture

下载: 全尺寸图片幻灯片

表 1 位移-轴向力关系与三维扫描参数

Table 1 Displacement-axial force telationship and 3D scanning parameters

加载速率/
(mm·min⁻¹) 轴向位移/
mm 轴向力/
N 扫描电流/
μA 扫描电压/
kV

1.0 0.146 20 100 130
0.1 0.246 431
0.346 732
0.446 1100
0.546 492

下载: 导出CSV

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