山东煤炭科技
山東煤炭科技
산동매탄과기
Shandong Coal Science and Technology
2014年
10期
67-69
,共3页
地面钻井%远距离保护层%采空区“三带”%FLUENT模拟
地麵鑽井%遠距離保護層%採空區“三帶”%FLUENT模擬
지면찬정%원거리보호층%채공구“삼대”%FLUENT모의
surface borehole%overlying long-distance coal seam%three zones of gob%FLUENT simulation
为研究地面钻井抽采上覆远距离煤层卸压瓦斯情况下采空区流场特征，建立了采空区“三带”几何模型，通过数值模拟手段进行分析。结果表明：采空区四周孔隙率、渗透率较大，是瓦斯渗流的主要通道；垂向上采空区中部具有瓦斯浓度先降低后升高直至保持不变的特点；在抽采负压作用下处于弯曲下沉带的卸压瓦斯易向钻井方向流动，不易向采空下方大量涌入。
為研究地麵鑽井抽採上覆遠距離煤層卸壓瓦斯情況下採空區流場特徵，建立瞭採空區“三帶”幾何模型，通過數值模擬手段進行分析。結果錶明：採空區四週孔隙率、滲透率較大，是瓦斯滲流的主要通道；垂嚮上採空區中部具有瓦斯濃度先降低後升高直至保持不變的特點；在抽採負壓作用下處于彎麯下沉帶的卸壓瓦斯易嚮鑽井方嚮流動，不易嚮採空下方大量湧入。
위연구지면찬정추채상복원거리매층사압와사정황하채공구류장특정，건립료채공구“삼대”궤하모형，통과수치모의수단진행분석。결과표명：채공구사주공극솔、삼투솔교대，시와사삼류적주요통도；수향상채공구중부구유와사농도선강저후승고직지보지불변적특점；재추채부압작용하처우만곡하침대적사압와사역향찬정방향류동，불역향채공하방대량용입。
To investigate the lfow rules of goaf in the condition of surface borehole for relieved gas in overlying long-distance coal seam, the geometric model of goaf with “three zones” was established and the method of numerical simulation was adopted. The results show that the porosity and permeability of goaf surrounding is high, which are the main passage for lfow of gas. The central goaf of vertical direction has the characteristic of the gas concentration increases ifrst and then stay the same. It’s easy for the relieved gas in the bending zone to lfow toward the borehole, but dififcult to pour into the underpart of goaf.
