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1、第22卷第5期(總第138期)煤礦開采Vol.22No.5(SeriesNo.138)2017年10月COALMININGTECHNOLOGYOctober2017基于“O”形圈理論地面鉆井瓦斯抽采技術(shù)優(yōu)化王志堅(jiān)(山西潞安集團(tuán)余吾煤業(yè)有限責(zé)任公司,山西長治046103)[摘要]以余吾煤礦N2105回采工作面地面鉆井抽采工程實(shí)踐為依托,基于采動(dòng)裂隙“O”形圈理論,通過Fluent軟件數(shù)值模擬分析,結(jié)合不同施工參數(shù)下地面鉆井抽采效果對(duì)比分析,對(duì)余吾煤礦地面鉆井布置位置、抽采負(fù)壓等參數(shù)進(jìn)行了優(yōu)化。研究表明:地面鉆
2、井水平上應(yīng)布置于采動(dòng)裂隙“O”形圈內(nèi),垂向上控制于垮落帶頂部和裂縫帶的中下部之間,抽采效率最高;通過正交模擬對(duì)比分析,地面抽采鉆井終孔距離煤層頂板垂高16m,距離回風(fēng)巷為40m時(shí)抽采效果最優(yōu);抽采負(fù)壓與抽采瓦斯?jié)舛瘸剩玻?122P-1.188的二次多項(xiàng)式關(guān)系,當(dāng)抽采負(fù)壓為45kPa時(shí),抽采濃度最C=-0.013P高,為2-0.013P+0.637的二次多項(xiàng)式關(guān)系,25.5%;抽采負(fù)壓與沿空留巷的瓦斯?jié)舛瘸剩茫剑?0001P當(dāng)抽采負(fù)壓為48kPa時(shí),沿空留巷的瓦斯?jié)舛茸畹?;通過抽采濃度與抽采負(fù)壓實(shí)測數(shù)據(jù)與擬
3、合公式計(jì)算結(jié)果對(duì)比,驗(yàn)證了擬合公式的合理性,為后期地面鉆井抽采參數(shù)的布置提供了科學(xué)依據(jù)。[關(guān)鍵詞]“O”形圈理論;地面鉆井;瓦斯抽采;優(yōu)化;采動(dòng)裂隙;Fluent軟件[中圖分類號(hào)]TD712.62[文獻(xiàn)標(biāo)識(shí)碼]A[文章編號(hào)]1006-6225(2017)05-0096-06OptimumSurfaceDrillingGasDrainageTechniqueBasedon“O”RingTheoryWANGZhi-jian(ShanxiLu’anGroupYuwuCoalMineCo.,Ltd.,Changzh
4、i046103,China)Abstract:IttakingsurfacedrillinggasdrainageprojectofN2105workingfaceofYuwucoalmineasanexample,basedon“O”ringtheoryofminingfracture,afternumericalsimulationanalysiswithFluentsoftware,combinewithcontrastiveanalysisofsurfacedrillinggasdrainageun
5、derdifferentconstructionparameters,thensomeparametersofsurfacedrillingposition,drainagepressuredofYuwucoalminewereoptimized.Thestudyingresultsshowedthatthepositioninhorizontalofsurfacedrillingshouldarrangeinsideofminingfracture“O”ring,andinverticalitshould
6、bearrangebetweencollapsezonerooftolowermiddlepartoffracturezone,andthendrainageefficiencywasthehighest,accordingorthogonalitysimulationcontrastiveanalysis,thegasdrainageresultswasthebestwhenthedistancethatsurfacedrillingholetocoalseamroofwas16manddistancet
7、oventilationroadwaywas40m,therelationshipbetween2+1.122P-1.188,whendrainagenegativepressuredrainagepressureandgasdensitypresentasquadraticpolynomialofC=-0.013Pwas45kPa,thedrainagedensitywasthehighestas25.5%,andtherelationshipbetweendrainagenegativepressure
8、andgasdensity2-0.013P+0.637,whendrainagenegativepressurewasofgob-sideentryretainingpresentasquadraticpolynomialofC=0.0001P48kPa,thegaddensityofgob-sideentryretainingwasthelowest,therationalityoffittingformula