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[1]马恒,唐鹏阳,王晓琪,等.液氮循环冻融作用下饱水煤岩孔隙演化与渗透率增益机制研究*[J].中国安全生产科学技术,2025,21(11):16-24.[doi:10.11731/j.issn.1673-193x.2025.11.002]
　MA Heng,TANG Pengyang,WANG Xiaoqi,et al.Study on pore evolution and permeability enhancement mechanisms of water-saturated coal rock under liquid nitrogen cyclic freeze-thaw[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2025,21(11):16-24.[doi:10.11731/j.issn.1673-193x.2025.11.002]
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液氮循环冻融作用下饱水煤岩孔隙演化与渗透率增益机制研究*

《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:
16-24
栏目:
学术论著
出版日期:
2025-11-30

文章信息/Info

Title:
Study on pore evolution and permeability enhancement mechanisms of water-saturated coal rock under liquid nitrogen cyclic freeze-thaw
文章编号:
1673-193X(2025)-11-0016-09
作者:
马恒; 唐鹏阳; 王晓琪; 高科; 王东莳
（1.辽宁工程技术大学 安全科学与工程学院，辽宁 葫芦岛 125000;
2.辽宁工程技术大学 矿山热动力灾害与防治教育部重点实验室，辽宁 葫芦岛 125000）
Author(s):
MA Heng ;  TANG Pengyang;  WANG Xiaoqi;  GAO Ke;  WANG Dongshi
（1.Safety Science and Engineering College,Liaoning Technical University,Huludao Liaoning 125000,China;
2.Key Laboratory of Mine Thermo-motive Disaster and Prevention,Ministry of Education,Liaoning Technical University,Huludao Liaoning 125000,China）
关键词:
饱水煤; 液氮冻融; 孔隙结构; 煤层气; 低场核磁共振
Keywords:
water-saturated coal;  liquid nitrogen freeze-thaw;  pore structure;  coalbed methane;  low field nuclear magnetic resonance (NMR)
分类号:
X936
DOI:
10.11731/j.issn.1673-193x.2025.11.002
文献标志码:
A
摘要:
为研究液氮循环冻融对饱水煤岩孔隙结构及力学性能的影响，基于液氮冻融对煤岩渗透率的显著效果，采用核磁共振实验方法，系统分析不同冻融循环次数（1~5次）下煤岩的孔隙演化规律特征。研究结果表明：经过循环冻融后，T2谱显示各峰幅值增大且谱峰右移，表明孔隙总体积增加且向更大孔径发展。煤岩内的各类孔隙逐渐发育，并扩张融合成中孔以及大孔，从而形成裂隙网络；经5次冻融后，煤岩孔隙度从1.089%增至2.571%，渗透率由0.771 mD显著增长至19.884 mD。与初次冻融相比，5次冻融后吸附孔T2谱面积增长了1.82倍，而渗流孔增长了5.23倍，煤岩的孔隙度和渗透率均呈现显著增长趋势；随着循环冻融次数的增加，裂隙逐渐扩展并贯通，形成新的裂缝网络，裂缝的新生使吸附孔中的束缚水被释放到更大的孔隙中转变为自由水，束缚水饱和度从47.413%降至13.973%，自由水饱和度从52.587%升至86.027%，表明液氮冻融通过水-冰相变冻胀力破坏孔隙结构，增强连通性，为煤层气运移提供高效通道。研究结果有助于深入了解液氮冻融对煤体孔隙结构和渗流特征的影响，为未来工业应用提供参考。
Abstract:
In order to investigate the influence of liquid nitrogen cyclic freeze-thaw on the pore structure and mechanical properties of water-saturated coal rock,given the significant effect of liquid nitrogen freeze-thaw on the permeability of coal rock,this study adopted the nuclear magnetic resonance (NMR) method to systematically analyze the pore evolution characteristics of coal rock under different freeze-thaw cycles (1~5 cycles).The results indicate that after cyclic freeze-thaw,the T2 spectrum shows increased amplitudes of all peaks and a rightward shift of the spectral peaks,indicating an increase in total pore volume and a shift toward larger pore diameters.Various pores within the coal rock gradually developed,expanded,and coalesced into mesopores and macropores,ultimately forming a fracture network.After 5 freeze-thaw cycles,the porosity of the coal rock increased from 1.089% to 2.571%,and permeability significantly rose from 0.771 mD to 19.884 mD.Compared to the initial freeze-thaw cycle,the T2 spectrum area of adsorption pores increased by 1.82 times,while that of seepage pores increased by 5.23 times after 5 cycles,demonstrating a significant increasing trend in both porosity and permeability of the coal rock.As the number of freeze-thaw cycles increased,fractures gradually extended and interconnected,forming new fracture networks.The newly formed fractures released bound water from adsorption pores into larger pores,thereby converting it into free water.The bound water saturation decreased from 47.413% to 13.973%,while free water saturation increased from 52.587% to 86.027%.This indicates that liquid nitrogen freeze-thaw disrupts the pore structure through the frost heave force generated by the water-ice phase change,enhancing connectivity and providing efficient channels for coalbed methane migration.The findings contribute to a deeper understanding of the impact of liquid nitrogen freeze-thaw on coal pore structure and seepage characteristics,offering valuable insights for future industrial applications.

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备注/Memo

备注/Memo:
收稿日期： 2025-08-18
* 基金项目： 辽宁省科学技术计划项目(2025-BS-0401)
作者简介： 马恒，博士，教授，主要研究方向为矿井通风安全、信息安全工程等。
通信作者： 唐鹏阳，硕士研究生，主要研究方向为矿山岩石力学、矿井智能通风等。
更新日期/Last Update: 2025-12-03