摘要
钻孔有效抽采半径是煤层瓦斯抽采参数设计的重要指标。为探究煤体基础物性因素(含水率、渗透率、瓦斯压力)对钻孔有效抽采半径的影响特性,首先基于煤的基质-裂隙双重孔隙理论,考虑水分对裂隙开度及基质瓦斯吸附性能的弱化影响,构建了考虑水分影响的煤体渗透率模型与固-气多场耦合模型;其次利用多物理场数值模拟方法并结合响应面分析法研究了不同因素对钻孔有效抽采半径的交互作用。研究发现钻孔有效抽采半径与初始渗透率呈正相关,而与初始瓦斯压力、含水率均为负相关;建立了瓦斯抽采半径与三个因素的二次多元响应面模型,并分析发现含水率、初始瓦斯压力、渗透率对钻孔有效抽采半径的影响显著性逐次降低,并且在一定程度上,煤体初始瓦斯压力的增加会弱化煤岩初始渗透率和含水率对钻孔有效抽采半径的影响,煤体初始渗透率和含水率也会显著改变初始瓦斯压力对钻孔有效抽采半径的影响,然而煤体初始渗透率几乎未改变含水率对钻孔有效抽采半径的影响。
The effective extraction radius of boreholes is an important index for the design of gas extraction parameters.In order to study the impact of the basic physical factors of coal(moisture content,permeability,gas pressure)on the effective extraction radius,based on the dual-pore structure of coal,considering the weakening effect of water on crack openness and matrix gas adsorption performance,both the permeability model and solid-gas multi-field coupling model that considering the impact of moisture were established;and then the multi-physics numerical simulation method and response surface analysis method were applied to analyze the interaction of the three factors on the effective extraction radius of borehole.Researches show that the effective extraction radius of boreholes is positively correlated with the initial permeability,and it is negatively correlated with the initial gas pressure and moisture content.Subsequently,a response surface model on the relationship between gas drainage radius and three factors was established,and then it was found that the effects of water content,initial gas pressure,and permeability on the effective extraction radius of boreholes decreased significantly in sequence.And the increase of the initial gas pressure of the coal body will weaken the influence of the initial permeability and moisture content on the effective extraction radius of boreholes,and the initial permeability and moisture content will also significantly change the influence of the initial gas pressure on the effective extraction radius of boreholes.However the initial permeability of the coal body hardly changes the influence of moisture content on the effective extraction radius of boreholes.
作者
陈明义
刘惠族
徐飞
田富超
陈晓昀
CHEN Ming-yi;LIU Hui-zu;XU Fei;TIAN Fu-chao;CHEN Xiao-yun(School of Safety Engineering and Emergency Management,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;State Key Laboratory of Coal Mine Safety Technology,China Coal Technology&Engineering Group Shenyang Research Institute,Fushun 113122,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)
出处
《科学技术与工程》
北大核心
2024年第19期8036-8044,共9页
Science Technology and Engineering
基金
国家自然科学基金(52174230,51804201)
河北省自然科学基金(E2020210081)
煤矿安全技术国家重点实验室开放基金(2021-KF-23-04)
石家庄铁道大学研究生创新资助项目(YC2023059)。
关键词
有效抽采半径
含水率
渗透率
瓦斯压力
响应面法
effective extraction radius
moisture content
initial permeability
initial gas pressure
response surface method
