煤矿安全2024，Vol.55Issue(3)：25-35,11.DOI:10.13347/j.cnki.mkaq.20221939
综采工作面卸压瓦斯运储区演化推进速度效应研究
Study on advancing speed effect of pressure relief gas transport and storage area evolution in fully mechanized mining face
摘要
Abstract
In order to study the evolution law of gas transportation and storage area under different advancing speed of fully-mechan-ized working face,based on the overview of coal mine project,we analyzed the effect of overburden mining advancing speed by us-ing FLAC3D numerical software for simulation,and used various methods to jointly discriminate the unloading gas transportation and storage area,obtained the distribution and evolution law of unloading gas transportation and storage area under different advancing speed conditions.Based on this,we optimized the high level extraction drilling in the field.The results show that after the coal seam mining in the fully mechanized mining face,the vertical stress distribution roughly follows a symmetrical trapezoidal shape,and the advancing speed is accelerated.The vertical stress distribution changes into a left high right low throw line;the subsidence amount and plastic failure height of the overlying rock in the goaf decrease with the increase of advancing speed;the height of the unloading gas storage area decreases with the increase of the advancing speed,and the location of the unloading gas storage area is concen-trated towards the middle of the goaf;after optimizing the pressure relief gas extraction drilling holes in the experimental working face,the maximum gas volume fraction of the extraction drilling holes in the high and low advancing speed areas of the experiment-al working face is above 30%.The gas volume fractions in the working face,return air roadway,and upper corner are 0.18%-0.46%,0.2%-0.46%,and 0.25%-0.84%,all less than 1%,making the layout method more reasonable.关键词
推进速度/FLAC3D/瓦斯运储区/高位钻孔/瓦斯抽采Key words
advancing speed/FLAC3D/gas transportation and storage area/high-level drilling/gas extraction分类
矿业与冶金引用本文复制引用
于涵旭,徐培耘,林海飞,刘思博,双海清,罗荣卫..综采工作面卸压瓦斯运储区演化推进速度效应研究[J].煤矿安全,2024,55(3):25-35,11.基金项目
国家自然科学基金资助项目(52074217) （52074217）
陕西省杰出青年科学基金科学基金资助项目(2020JC-48) （2020JC-48）
国家自然科学基金青年科学基金资助项目(51904238) （51904238）
