深部煤体注水过程中渗流通道演化特征
The evolution characteristics of seepage channel during water infusion in deep coal samples
-
摘要: 在煤炭开采中，煤层注水可有效防突降尘和防治冲击地压。为了研究深部煤样注水过程中孔隙结构和渗流通道的演化过程，以平煤十二矿己15-31030工作面的深部煤体为研究对象，通过低场核磁共振成像设备在线测试了三个原煤试样在不同注水压力下的T2谱和含水量分布情况。通过对不同注水压力下的T2谱进行分析，获得了煤样注水过程中的孔径分布和孔隙结构的演化过程。通过核磁共振成像技术，初步实现了煤样注水过程中孔隙结构和渗流通道演化的可视化，可更直观地观测煤样注水过程中的动态演化过程，更深入地理解不同煤样T2谱演化过程异同的内在原因。进一步提出了一种根据T2谱进行不同孔径的孔的渗透率贡献度计算方法，定量分析了煤样注水过程中不同孔径的孔对水渗过程的贡献度。并对T2谱进行了孔裂隙的分形维数计算，定量分析煤样孔裂隙的渗流空间含量和异质性。研究发现：平煤十二矿深部煤样注水过程中T2谱表现出三峰特点，中孔、大孔和微裂隙的含量与连通性都大于微孔和小孔，注水过程中渗流通道主要由连通性较好的中孔、大孔和微裂隙构建。煤样注水过程中大孔和微裂隙贡献了99%以上的渗透率;微孔、小孔和连通性较差的孔主要参与储水而不参与运水。注水过程中当煤样孔隙连通性较差，不存在明显的优势渗流通道时，提高注水压力可以使更多的孔隙参与到渗流的过程中;但当煤样中部分孔隙连通性较好形成优势渗流通道时，提高注水压力也很难使更多的孔隙参与到渗流的过程中。在设计煤层注水参数时应特别关注这一现象。Abstract: In coal mining,coal seam water infusion can effectively prevent coal outburst,dust and rock burst.In order to study the evolution process of pore structure and seepage channels during water infusion in deep coal samples,the coal at the No.310130 working face of the Ji15 coal seam in No.12 Pingdingshan Coal Mine was sampled for this study.The T2 spectrum and water content distribution of three raw coal samples under different water infusion pressures were tested online by low-field nuclear magnetic resonance imaging equipment.By analyzing the T2 spectra under different water infusion pressures,the pore size distribution and pore structure evolution process of the coal sample during water injection were obtained.Through the nuclear magnetic resonance imaging technology,the visualization of the evolution of the pore structure and seepage channels during the water infusion process of coal samples was initially realized,the dynamic evolution process of the coal samples during the water infusion process was observed more intuitively,and the internal reasons for the similarities and differences of the T2 spectrum evolution process of different coal samples were more deeply understood.A method for calculating the permeability contribution of pores with different pore diameters based on the T2 spectrum was proposed,and the contribution of pores with different pore diameters to the water permeability process during the water infusion process of coal samples was quantitatively analyzed.The fractal dimension calculation of T2 spectrum was performed,and the content and heterogeneity of the seepage space of coal samples were quantitatively analyzed.The test results show that the T2 spectrum of the deep coal sample in the No.12 Pingdingshan Coal Mine shows the characteristics of three peaks during the water injection process.The content and connectivity of mesopores,macropores,and microcracks are all greater than those of micropores.In the process of water infusion of coal samples,macropores and microcracks contribute more than 99% of the permeability.The micropores and pores with poor connectivity are mainly involved in water storage rather than water transport.During the water infusion process,when the pore connectivity of the coal sample is poor and there is no obvious dominant seepage channel,increasing the water injection pressure can make more pores participate in the seepage process.However,when the coal sample has better connectivity and has dominant seepage channel,it is difficult to increase the water infusion pressure to make more pores participate in the seepage process.Therefore,it is worth noting it during the design of coal seam water infusion parameters.
-
-
期刊类型引用(22)
1. 王恩茂，王刚，解树亮，魏宏钊，冯净，梁瀚丹. 煤体注水渗流模型构建及微观主控影响规律. 工程科学学报. 2025(02): 271-281 . 
百度学术
2. 王刚，陈雪畅，程卫民，刘震，孙路路，徐浩. 煤层注水渗流与润湿机制研究进展. 山东科技大学学报(自然科学版). 2025(01): 1-17 . 百度学术
3. 葛俊岭，王彦敏，刘涛. 基于UDF的煤层注水渗流演化规律的数值模拟研究. 煤矿安全. 2024(01): 78-85 . 百度学术
4. 高魁，王有为，乔国栋，田宇，傅师贵. 构造煤层顶板爆破跨界面致裂增透机制研究及应用. 煤田地质与勘探. 2024(04): 35-46 . 百度学术
5. 张苗，刘钦节，王兴阵，董志勇. 整合压汞、N_2和CO_2吸附的中-高阶煤多重分形特征. 煤炭学报. 2024(05): 2394-2404 . 本站查看
6. 董近兴，张涛，任康江. VES清洁压裂液的配制及性能评价. 煤. 2024(08): 1-5 . 百度学术
7. 张天，穆新升，葛少成，李胜，佟林全，陶爽，王长友. 超音速同轴气动雾化降尘技术. 煤炭学报. 2024(07): 3118-3128 . 本站查看
8. 高明忠，高政，杨本高，谢晶，王明耀，郝海春，吴岩，周浪，王静宇. 水-力耦合作用下煤岩宏细观力学行为及渗流特性研究（英文）. Journal of Central South University. 2024(08): 2765-2779 . 百度学术
9. 严敏，王欣宇，闫冬洁，李树刚，汪诚，王雨奔，何金梅. 羧甲基纤维素对表面活性剂泡沫性能及瓦斯解吸影响研究. 西安科技大学学报. 2024(05): 835-845 . 百度学术
10. Rui-Shuai Ma，Ji-Yuan Zhang，Qi-Hong Feng，Xue-Ying Zhang，Yan-Hui Yang. Effect of cyclic hydraulic stimulation on pore structure and methane sorption characteristics of anthracite coal: A case study in the Qinshui Basin, China. Petroleum Science. 2024(05): 3271-3287 . 必应学术
11. 刘志雄，赵天成，孙鹏，庞政. 基于核磁共振技术的类岩石细观特征及对渗透率影响研究. 内蒙古科技大学学报. 2024(03): 218-221 . 百度学术
12. 杨明，韩龙祥，张铁岗，高建良，何敏，张学博. 变压注水环境下煤体孔隙动态演化规律研究. 煤炭学报. 2024(S2): 1033-1040 . 本站查看
13. 朱帅润，何博，吴礼舟，李绍红，卿毅伟. 非饱和渗流模拟中非均匀空间网格的改进方法. 水文地质工程地质. 2023(01): 32-40 . 百度学术
14. 王和堂，章琦，王德明，李星诚，徐超航. 矿山抑尘泡沫基础特性及性能定量评估方法. 煤炭学报. 2023(04): 1584-1595 . 本站查看
15. 刘晓飞，薛宗建，牛滕冲. 水浸煤体周期应力承载特征研究. 煤矿安全. 2023(08): 179-185 . 百度学术
16. 马勇，周长超，卢育. 掘进面尘源分析及注水减尘技术研究. 煤炭科技. 2023(04): 167-171 . 百度学术
17. 王宏伟，张翠敏，宋嘉祺，王泽亮，潘艳. 煤岩体裂隙结构形态和力学属性的可视化数据库构筑初探. 煤炭科学技术. 2023(S1): 27-39 . 百度学术
18. 李树刚，闫冬洁，严敏，白杨，岳敏. 烷基糖苷活性剂对煤体结构改性及甲烷解吸特性的影响. 煤炭学报. 2022(01): 286-296 . 本站查看
19. 毛彦军，陈曦，范超男，葛少成，李文璞. 基于CT三维重建的注水煤岩体裂隙扩展规律研究. 岩土力学. 2022(06): 1717-1726 . 百度学术
20. 许圣东，左钦. 注水压力对煤孔径影响试验研究. 能源与节能. 2022(07): 54-56 . 百度学术
21. 宋鑫，柳晓莉. 电阻法测定水在煤体中渗吸特征的实验研究. 河南科技. 2021(24): 85-87 . 百度学术
22. 刘厅，翟成，赵洋，孙勇. 基于LF-NMR的页岩多尺度孔裂隙应力敏感性评价. 煤炭学报. 2021(S2): 887-897 . 本站查看
其他类型引用(21)
下载:
图(9)
计量
- 文章访问数: 1645
- HTML全文浏览量: 6
- PDF下载量: 958
- 被引次数: 43
