安徽理工大学学报（自然科学版）
安徽理工大學學報（自然科學版）
안휘리공대학학보（자연과학판）
Journal of Anhui University of Science and Technology (Natural Science)
2015年
3期
77-82
,共6页
掏穴增透%预抽瓦斯%数值模拟
掏穴增透%預抽瓦斯%數值模擬
도혈증투%예추와사%수치모의
permeability improvement%gas drainage%numerical simulation
为提高低透煤层瓦斯抽采效果，提出了一种掏穴扩孔增透技术。以李嘴孜矿A1煤为研究对象，通过现场测试与分析，考察了A1煤掏穴扩孔前后瓦斯抽采影响半径，抽采浓度和抽采纯量；同时采用RFPA2D －Flow模拟软件模拟了扩孔前后煤层裂隙的起裂及扩展过程，分析了掏穴扩孔钻孔对煤层透气性的影响。结果表明：掏穴扩孔钻孔增加了钻孔内壁表面积，增大周围煤体裂隙，使得周围煤体中的应力得到释放。掏穴扩孔后，瓦斯抽采影响半径提高了1．3倍，抽采浓度提高1．9倍，抽采纯量提高了2．3倍，因此，掏穴扩孔钻孔具有提高钻孔瓦斯抽采效果，达到快速消突的目的。
為提高低透煤層瓦斯抽採效果，提齣瞭一種掏穴擴孔增透技術。以李嘴孜礦A1煤為研究對象，通過現場測試與分析，攷察瞭A1煤掏穴擴孔前後瓦斯抽採影響半徑，抽採濃度和抽採純量；同時採用RFPA2D －Flow模擬軟件模擬瞭擴孔前後煤層裂隙的起裂及擴展過程，分析瞭掏穴擴孔鑽孔對煤層透氣性的影響。結果錶明：掏穴擴孔鑽孔增加瞭鑽孔內壁錶麵積，增大週圍煤體裂隙，使得週圍煤體中的應力得到釋放。掏穴擴孔後，瓦斯抽採影響半徑提高瞭1．3倍，抽採濃度提高1．9倍，抽採純量提高瞭2．3倍，因此，掏穴擴孔鑽孔具有提高鑽孔瓦斯抽採效果，達到快速消突的目的。
위제고저투매층와사추채효과，제출료일충도혈확공증투기술。이리취자광A1매위연구대상，통과현장측시여분석，고찰료A1매도혈확공전후와사추채영향반경，추채농도화추채순량；동시채용RFPA2D －Flow모의연건모의료확공전후매층렬극적기렬급확전과정，분석료도혈확공찬공대매층투기성적영향。결과표명：도혈확공찬공증가료찬공내벽표면적，증대주위매체렬극，사득주위매체중적응력득도석방。도혈확공후，와사추채영향반경제고료1．3배，추채농도제고1．9배，추채순량제고료2．3배，인차，도혈확공찬공구유제고찬공와사추채효과，체도쾌속소돌적목적。
In order to improve the effect of gas drainage in coal seam of low permeability , a permeability improve-ment technology by enlarging diameter of boreholes was proposed .Taking A1 coal seam of Liyi Coal Mine as the research object , by field test and analysis , the size of the radius of influence for gas drainage , concentration and volume of gas drained before and after boreholes being enlarged were investigated .By using numerical simulation software RFPA2D -Flow, the process of crack starting and extension of coal seam before and after boreholes being enlarged was simulated , and the influence of borehole enlargement on permeability of the coal seam was analy-zes.The results showed that by enlarged borehole the wall surface area of boreholes increases , and fractures in coal seam around boreholes increase , thus the stress in the coal body around the boreholes was released .The gas drainage radius after borehole being enlarged increased by 1.3 times, concentration of gas drained increased by 1.9 times and the volume of gas by 2.3 times.The technology improves gas drainage effect , and fast eliminates outburst of coal and gas .
