[1]张曦,马衍坤,胡明烨,等.基于NMR循环加卸载作用下烟煤损伤演化与渗流特征试验研究*[J].中国安全生产科学技术,2025,21(11):5-15.[doi:10.11731/j.issn.1673-193x.2025.11.001]
ZHANG Xi,MA Yankun,HU Mingye,et al.Experimental study on damage evolution and seepage characteristics of bituminous coal under NMR-based cyclic loading and unloading[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2025,21(11):5-15.[doi:10.11731/j.issn.1673-193x.2025.11.001]
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基于NMR循环加卸载作用下烟煤损伤演化与渗流特征试验研究*
ZHANG Xi,MA Yankun,HU Mingye,et al.Experimental study on damage evolution and seepage characteristics of bituminous coal under NMR-based cyclic loading and unloading[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2025,21(11):5-15.[doi:10.11731/j.issn.1673-193x.2025.11.001]
《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]
- 卷:
- 21
- 期数:
- 2025年11期
- 页码:
- 5-15
- 栏目:
- 学术论著
- 出版日期:
- 2025-11-30
文章信息/Info
- Title:
- Experimental study on damage evolution and seepage characteristics of bituminous coal under NMR-based cyclic loading and unloading
- 文章编号:
- 1673-193X(2025)-11-0005-11
- 分类号:
- X936
- 文献标志码:
- A
- 摘要:
- 为探明采掘扰动对煤体内瓦斯运移通道的影响规律，利用配置专用夹持器的核磁共振（nuclear magnetic resonance，NMR）测试仪，原位测试烟煤循环加卸载过程中T2图谱和MRI（磁共振）成像，研究烟煤循环加卸载作用下损伤演化与渗流特征。研究结果表明：随着循环加载应力上限由70%σpeak增至90%σpeak，煤样破坏所需经历的循环加卸载次数由1 700次锐减至60次；循环加卸载过程中，前期总孔隙体积减少，后期吸附孔连通、扩展和发育形成渗流孔和运移孔，煤样渗流孔分形维数D2呈下降趋势，渗流孔逐渐连通；MRI成像渗流通道呈现整体受压-轴向连通-径向扩展的演化趋势，煤样中段孔裂隙信号变化率最大，按加载应力上限由小到大依次为38.73%，64.27%，64.28%，79.50%，中段孔裂隙结构劣化作用较为明显。加卸载应力差较小时，煤样累积损伤呈现指数增长趋势，加卸载应力差增大，损伤呈持续加剧的对数增长趋势。随着加卸载应力差的增大，孔隙损伤D与渗透率k的关联变得高度协同且正相关。研究结果可为煤矿开采过程、煤岩动力灾害中煤体孔隙及渗流通道损伤演化提供理论参考。
- Abstract:
- In order to investigate the influence mechanism of mining disturbance on gas migration channels within the coal body,a nuclear magnetic resonance (NMR) testing system equipped with a specialized holder was used to conduct in-situ measurements of T2 spectra and magnetic resonance imaging (MRI) of bituminous coal during cyclic loading and unloading.The study examined the damage evolution and seepage characteristics of bituminous coal samples under cyclic loading and unloading conditions.The results indicate that as the upper cyclic loading stress limit increases from 70%σpeak to 90%σpeak,the number of cycles required for coal sample failure decreases sharply from 1 700 cycles to 60 cycles.During cyclic loading and unloading,the total pore volume decreases in the initial stage,while in the later stage,adsorption pores connect,expand,and develop into seepage pores and migration pores.The fractal dimension D2 of seepage pores in coal shows a decreasing trend,indicating gradual connectivity of seepage pores.MRI images reveals that the seepage channels evolve through stages of overall compression,axial connectivity,and radial expansion.The variation rate of pore-fracture signals is highest in the middle section of the coal sample,with values of 38.73%,64.27%,64.28%,and 79.50% corresponding to increasing upper stress limits,indicating a pronounced deterioration of the pore-fracture structure in the middle section.When the stress difference during loading and unloading is small,the cumulative damage in the coal sample exhibits an exponential growth trend.As the stress difference during loading and unloading increases,the damage shows a sustained and accelerating logarithmic growth trend.With the increase in the stress difference during loading and unloading,the correlation between pore damage D and permeability k becomes highly synergistic and positively correlated.The findings provide theoretical insights into the damage evolution of pores and seepage channels in the coal body during coal mining processes and coal-rock dynamic disasters.
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相似文献/References:
[1]郜欣,徐颖,李成杰,等.不同应力比的循环荷载下砂岩变形损伤特性研究*[J].中国安全生产科学技术,2021,17(11):60.[doi:10.11731/j.issn.1673-193x.2021.11.009]
GAO Xin,XU Ying,LI Chengjie,et al.Research on deformation and damage characteristics of sandstone under cyclic load with different stress ratios[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2021,17(11):60.[doi:10.11731/j.issn.1673-193x.2021.11.009]
备注/Memo
- 备注/Memo:
-
收稿日期： 2025-07-17
* 基金项目： 云南省重点研发计划项目（202303AA080014）；国家自然科学基金项目（52174161）；安徽省高校杰出青年科研项目(2024AH020001)
作者简介： 张曦，硕士，高级实验师，主要研究方向为矿井瓦斯灾害防治。
通信作者： 马衍坤，博士，教授，主要研究方向为含瓦斯煤岩动力灾害机理与防控预警。
