1.School of Safety Engineering and Emergency Management,Shijiazhuang Tiedao University;2.School of Civil Engineering,Shijiazhuang Tiedao University;3.State Key Laboratory of Coal Mine Safety Technology China Coal Technology Engineering Group Shenyang Research Institute
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, consider 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 are established; and then the multi-physics numerical simulation method and response surface analysis method are applied to analyze the interaction of the three factors on the effective extraction radius of borehole. Researches show that the effective extraction radius 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 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, and the initial permeability and moisture content will also significantly change the influence of the initial gas pressure on the effective extraction radius; however the initial permeability of the coal body hardly changes the influence of moisture content on the effective extraction radius.
陈明义,刘惠族,徐飞,等. 基于响应面法的煤体有效抽采半径多因素交互作用研究[J]. 科学技术与工程, , ():复制