CAJ | 학술논문

为获得含瓦斯煤开采过程中渗透率的采动响应规律，从孔隙率的基本定义出发，通过引入增透率来反映单位体积改变下煤体渗透率的变化，建立了基于体积应变的含瓦斯煤增透率模型。基于增透率模型，结合工程实例采用Comsol Multiphysics 模拟了含瓦斯煤开采过程中增透率的变化规律，并开展了增透率采动响应的试验研究。研究结果表明：增透率模型可对采动裂隙网络形成的煤层透气性进行定量评价研究，采动是影响含瓦斯煤增透率的关键因素，受采动影响，煤体体积应变、增透率的变化规律均基本一致，煤体膨胀变形、增透率随采煤工作面的推进逐渐增大，增透率的变化滞后于体积应变的变化，且越靠近工作面煤层增透效果和瓦斯抽采效果越好；沿煤层倾向，回风巷侧最大瓦斯抽采量大于运输巷侧，煤体增透率亦大于运输巷侧。依据增透率的采动响应规律调整瓦斯抽采孔与工作面的角度，可增加抽采量，降低工作面瓦斯浓度。
위획득함와사매개채과정중삼투솔적채동향응규률，종공극솔적기본정의출발，통과인입증투솔래반영단위체적개변하매체삼투솔적변화，건립료기우체적응변적함와사매증투솔모형。기우증투솔모형，결합공정실례채용Comsol Multiphysics 모의료함와사매개채과정중증투솔적변화규률，병개전료증투솔채동향응적시험연구。연구결과표명：증투솔모형가대채동렬극망락형성적매층투기성진행정량평개연구，채동시영향함와사매증투솔적관건인소，수채동영향，매체체적응변、증투솔적변화규률균기본일치，매체팽창변형、증투솔수채매공작면적추진축점증대，증투솔적변화체후우체적응변적변화，차월고근공작면매층증투효과화와사추채효과월호；연매층경향，회풍항측최대와사추채량대우운수항측，매체증투솔역대우운수항측。의거증투솔적채동향응규률조정와사추채공여공작면적각도，가증가추채량，강저공작면와사농도。
In order to obtain the mining response laws of permeability in the process of gas-filled coal mining , start-ing from the basic definition of porosity , the change of permeability of coal under the unit volume change was reflec -ted by introducing mining-enhanced permeability , the mining response model of permeability was established based on volumetric strain .The variation of mining-enhanced permeability in the process of coal mining was simulated based on the mining-enhanced permeability model by using Comsol Multiphysics , and the mining response of min-ing-enhanced permeability in the field was studied .The results showed that the coal seam permeability formed by the mining-induced fracture network can be quantitatively evaluated by the mining-enhanced permeability model . Mining is the key controlling factor affecting coal permeability , the variation of volumetric strain , mining-enhanced permeability is consistent affected by mining , the swelling deformation of coal and permeability increases gradually as the working face advancing , the mining-enhanced permeability changes lag behind the changes of volumetricstrain , and the closer to the face , the better results of mining-enhanced permeability effects and gas extraction .A-long the coal seam , the largest gas drainage , the fractured development and the extent of damage at the return air-way side seam are greater than those of haulage roadway at the same location away from the face;mining-enhanced permeability is also greater than that of haulage roadway .The gas holes are set to a certain angle with working face based on the mining response laws of mining-enhanced permeability;it can prolong the gas drainage time , increase the amount of gas drainage and prevent the gas gauge effectively .