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注水煤体水分运移中渗流-相变-自吸的理论模型与实验验证

Theoretical model and experimental verification of seepage-transition-spontaneous imbibition in water migration of water-injected coal.

作者信息

Sun Qiushuang, Guo YanLei, Chen Jian, Yang Xinda, Yan Xuehan, Hu Xiangming, Guo Liwen, Jin Yee-Chung

机构信息

School of Emergency Management and Safety Engineering, North China University of Science and Technology, TangShan, 063210, China.

Hebei Province Key Laboratory of Mining Development and Security Technology, TangShan, 063210, China.

出版信息

Sci Rep. 2025 Mar 15;15(1):9007. doi: 10.1038/s41598-024-82169-1.

DOI:10.1038/s41598-024-82169-1
PMID:40089529
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11910519/
Abstract

Coal seam water injection is widely applied to prevent mine disasters. In the traditional water migration model of water-injected coal, from ignoring capillary force in the seepage stage to generating the capillary dynamic during the spontaneous imbibition state, no transition state exists from 0 to generating capillary force. In this paper, on the basis of theoretical analysis, an equivalent capillary term is introduced to modify the Forchheimer model, and then a seepage-transition-spontaneous imbibition model that is suitable for water migration of water-injected coal is proposed. The formulas for the upper critical point velocity v, lower critical point velocity v, and water migration range of the transition state are derived. An analysis experiment of the spontaneous imbibition state in the coal rock water injection process and a monitoring experiment of the water injection process based on nuclear magnetic resonance method are conducted to verify the accuracy of the model. The results show that the accuracy of the water migration model, which takes the transition section into account, exceeds 0.99, representing a 12% improvement compared to the fitting precision of the water injection model that does not consider the transition section. The water migration process of water-injected coal cannot be accurately reflected without considering the transition section. In this paper, the water migration model of water-injected coal is improved, which provides theoretical support for a deeper understanding of the water injection mechanism and for enhancing the extraction efficiency of the coal seam.

摘要

煤层注水被广泛应用于预防矿井灾害。在传统的注水煤体水分运移模型中,从渗流阶段忽略毛管力到自吸状态产生毛管动力,不存在从0到产生毛管力的过渡状态。本文在理论分析的基础上,引入等效毛管项对福希海默模型进行修正,进而提出适用于注水煤体水分运移的渗流 - 过渡 - 自吸模型。推导了过渡状态的上临界点速度v、下临界点速度v以及水分运移范围的计算公式。开展了煤岩注水过程自吸状态分析实验和基于核磁共振法的注水过程监测实验,以验证模型的准确性。结果表明,考虑过渡段的水分运移模型精度超过0.99,相较于未考虑过渡段的注水模型拟合精度提高了12%。不考虑过渡段无法准确反映注水煤体的水分运移过程。本文对注水煤体水分运移模型进行了改进,为深入理解注水机理及提高煤层开采效率提供了理论支持。

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