外水侵入对受载煤体瓦斯渗流的影响规律研究

项目名称： 外水侵入对受载煤体瓦斯渗流的影响规律研究

项目编号： No.51474219

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 王凯

作者单位： 中国矿业大学（北京）

项目金额： 82万元

中文摘要： 采用实验室实验、理论研究、数值模拟与现场测试相结合的方法，选取不同变质程度、不同破坏类型煤样，实验模拟不同瓦斯压力和受载状态下外界压力水侵入煤体过程，研究在不同的外水侵入条件下，煤体含水率增量和瓦斯渗透率的变化规律；进而研究外水侵入结束后，煤体含水率随瓦斯渗流涌出过程的变化规律，以及瓦斯渗透率随煤体含水率变化的耦合规律；在此基础上，运用岩石力学与渗流力学等相关理论，分析外水侵入对受载含瓦斯煤渗透率影响的机理，结合煤体力学与孔隙结构参数，建立考虑侵入水压和时间效应的煤体含水率-应力-瓦斯压力-渗透率动态耦合模型，最后通过数值模拟和实验结果进行验证和完善。预期研究成果可深入揭示外水侵入对煤层瓦斯渗流的影响规律，从而为采取合理的水力化强化瓦斯抽采与瓦斯治理技术及其工艺参数优化和效果评估提供理论依据，对于提高水力化措施强化瓦斯抽采率以及瓦斯治理效果具有重要的理论和实际意义。

中文关键词： 外水侵入；受载含瓦斯煤；含水率；瓦斯渗透率；渗流

英文摘要： This project aims at investigating the influence of water intrusion on gas permeability in stressed coal, and will adopt a combined method including experimental study, theoretical analysis, numerical modeling and in situ test. Coal samples with different ranks and deformed degrees will be used in experimental study, the pore distribution and mechanical parameters of the coal samples will be tested. Through varying stress, gas pressure and water pressure, the increment of water content and the change of gas permeability in coal will be investigated during and after water intrusion respectively. Based on the experimental results, by using the theories of rock mechanics and fluid mechanics, a coupling model, which considers the pressure of incursive water and time effect, will be developed, it will link water content, stress, gas pressure and gas permeability in coal together; subsequently, the developed model will be verified by numerical modeling and in situ test. The expected results of this project can demonstrate the influence of water intrusion on gas permeability in stressed coal, thus it is beneficial for optimizing and evaluating the water-based enhanced gas drainage, and has significant theoretical and practical values for gas drainage and controlling work.

英文关键词： water intrusion;stressed gassy coal;water content;gas permeability;permeation