水力耦合作用下煤岩渗流动态演化规律研究  

Study on dynamic evolution law of coal rock seepage under hydraulic coupling effect

作　　者：赵志鹏 刘涛 郑磊 黄立宁 Zhao Zhipeng;Liu Tao;Zheng Lei;Huang Lining(CHN Energy Xinjiang Kuangou Mining Co.,Ltd.,Changji 831100,China;CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]国能新疆宽沟矿业有限责任公司,新疆昌吉831100 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《能源与环保》2025年第2期9-15,24,共8页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：重庆市自然科学基金面上项目(cstc2021jcyj-msxmX1184)。

摘　　要：煤层注水广泛应用于煤炭开采过程,然而目前关于水力耦合作用下煤岩注水渗流的动态数值模拟相关研究较少,对煤体内部水压分布及水分扩展进行实时动态模拟具有重要的理论意义。在煤岩水力耦合渗流试验的基础上,获得煤岩孔隙率、渗透率与应力的关系;基于UDF二次开发,在ANSYS中构建几何模型,将建立的孔隙率—应力模型编程并导入Fluent软件,进行不同应力状态下煤岩注水渗流动态模拟研究。模拟结果表明,在注水过程中,试件渗透率受应力与水压共同影响;应力条件相同、存在注水压差的情况下,高水压促进了试件的裂隙扩展,煤岩渗透性能变化程度更加显著,水压扩展速度越快,水压分布越范围广;水分在水压作用下进入煤体,渗入内部的水压不断降低,主要损耗于驱动水分在孔隙结构中的渗流;水压由煤岩圆心处开始扩展,上端压力扩展速度比下端快;水分扩展与注水压力联系紧密,水压越高,水分扩散越广。模拟得到的水压分布、水分扩展云图分析结果与试验结果一致性较高,进一步验证了模拟的准确性,模拟结果对深入研究煤岩注水渗流过程、提高煤层注水效率具有参考意义。Coal seam water injection is widely used in coal mining process.However,there are currently few researches on dynamic numerical simulation of coal rock water injection seepage under hydraulic coupling,the real-time dynamic simulation of water pressure distribution and water expansion in coal is of great theoretical significance.The relationship between porosity,permeability and stress of coal was obtained on the basis of hydraulic coupling seepage test.On the basis of coal rock hydraulic coupling seepage test,the relationship between coal rock porosity,permeability and stress was obtained.Based on UDF secondary development,the geometric model was constructed in ANSYS,and the established porosity stress model was programmed and imported into Fluent software to carry out dynamic simulation of coal water injection seepage under different stress states.The simulation results show that the permeability of the specimen is affected by both stress and water pressure during water injection.Under the same stress conditions,in the presence of a water injection pressure difference,high water pressure accelerates the crack propagation.The change in the permeability of coal is more significant,and the faster the water pressure expands,the wider the range of the water pressure distribution becomes.Water enters the coal under the action of water pressure,and the water pressure penetrating into the interior decreases continuously,which is mainly lost to drive water seepage in the pore structure.The water pressure starts to expand from the center of the coal rock circle,and the pressure at the upper end expands faster than that at the lower end.The water expansion is closely related to water injection pressure.The higher water pressure is,the wider water diffusion is.The simulated results of water pressure distribution and water expansion cloud map are in good agreement with the experimental results,which further verifies the accuracy of the simulation.The simulation results have a reference significance for further studying the s

关 键 词：水力耦合 数值模拟 UDF 水压分布 水分扩展 

分 类 号：TD713[矿业工程—矿井通风与安全]