中国煤炭
中國煤炭
중국매탄
CHINA COAL
2014年
9期
111-113
,共3页
顺层钻孔%瓦斯抽采半径%气体示踪法%布孔间距
順層鑽孔%瓦斯抽採半徑%氣體示蹤法%佈孔間距
순층찬공%와사추채반경%기체시종법%포공간거
borehole drilled along coal seam%radius of gas drainage%gas tracer method%borehole distance
为快速准确测定顺层钻孔的瓦斯抽采半径,采用 SF6气体示踪法作为测试方法,在唐山矿T3285工作面沿煤壁布置平行试验钻孔,选定两端的其中一个钻孔作为 SF6气体的释放孔,其余作为抽采检测孔,在一定的抽采负压下,依次检测 SF6气体在抽采检测孔中出现的时间,可确定瓦斯抽采半径。结果表明,瓦斯抽采时间与抽采半径呈现幂函数关系,钻孔直径75 mm,抽采负压14 kPa条件下,抽采30 d时瓦斯抽采半径为4??2 m,当钻孔间距大于4??2m时抽采所需天数可通过回归的方法计算得出。
為快速準確測定順層鑽孔的瓦斯抽採半徑,採用 SF6氣體示蹤法作為測試方法,在唐山礦T3285工作麵沿煤壁佈置平行試驗鑽孔,選定兩耑的其中一箇鑽孔作為 SF6氣體的釋放孔,其餘作為抽採檢測孔,在一定的抽採負壓下,依次檢測 SF6氣體在抽採檢測孔中齣現的時間,可確定瓦斯抽採半徑。結果錶明,瓦斯抽採時間與抽採半徑呈現冪函數關繫,鑽孔直徑75 mm,抽採負壓14 kPa條件下,抽採30 d時瓦斯抽採半徑為4??2 m,噹鑽孔間距大于4??2m時抽採所需天數可通過迴歸的方法計算得齣。
위쾌속준학측정순층찬공적와사추채반경,채용 SF6기체시종법작위측시방법,재당산광T3285공작면연매벽포치평행시험찬공,선정량단적기중일개찬공작위 SF6기체적석방공,기여작위추채검측공,재일정적추채부압하,의차검측 SF6기체재추채검측공중출현적시간,가학정와사추채반경。결과표명,와사추채시간여추채반경정현멱함수관계,찬공직경75 mm,추채부압14 kPa조건하,추채30 d시와사추채반경위4??2 m,당찬공간거대우4??2m시추채소수천수가통과회귀적방법계산득출。
In order to fast and accurately determine the radius of gas drainage of boreholes drilled along coal seam,SF6 was used as a gas tracer??Paralleling boreholes were arranged along the coal wall at T3 285 working face in Tangshan Coal Mine,one of which at the end was chosen as SF6 releasing borehole and the rest as drainage boreholes??Under a certain negative pressure, SF6 released time from the drainage boreholes was detected in turn,and then the drainage radius was determined??The results showed that the radius and the time of gas drainage follow a power function relationship??For boreholes in the diameter of 75 mm,the gas drainage radius was 4??2 m after drainage for 30 d under a negative pressure of 14 kPa.
