科技文献选读英语作业

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1、TheImprovementoftheMineGasDrainage矿井中瓦斯抽排的改进Abstract：EffectivegasmanagementisvitaltothesuccessofthelongwallminingintheBullseam,intheSouthernCoalfield,SydneyBasin,NSW,Australia.Theevolutionofgasdrainagemethodsandpracticesarediscussedwithrespecttogastype,gasdrainageleadtimeandprevailinggeo

2、logicalconditions.（本文就瓦斯气体类型，气体抽放前置时间和泛地质条件下的气体抽放方法和实践的进展进行了讨论。）Bothundergroundtoinseamdrillingandsurfacetoinseamdrillingtechniquesaredescribedatbothpro・drainageandpost・drainageconditions.。（在前期抽放和后期抽放的条件下，对地面钻洞到煤层和地下钻洞到煤层的钻探技术都进行了描述。）Post-drainageofgasfromlongwallisdiscussedforitseffecti

3、veness,practicabilityandefficiency.Thelongtermbenefitofthemethodselectedisexaminedwithrespecttogascaptureefficiencv・Analternativemethodofsurfacebasedmined・outareadrainage,usingmediumradiusdrillingtechnologytodrillhorizontalboreholesaboveand/orbelowtheproductionseamintothepartialcavingzon

4、epriortolongwallmineckoutareaformationisproposed.（本文还涉及至寸——牙中可选择的采空区瓦斯抽放方法，即利用中曲率钻井技术，在工作面上方或下方或是上下都钻探水平钻井直到连通到采空区前端的部分崩落区，以实现采空区的瓦斯抽放。）1INTRODUCTIONEffectivegasmanagementisvitaltothesuccessofthelongwallminesoperatingintheBullseam,locatedintheSouthernSydneyBasin,Australia・Highgasemission

5、sarecharacteristicoftheregionwithspec讦icgasemissionstvpicallvintheorderof30・45m3/t.（30・45m3/t的高瓦斯排放量是本地区特殊气体排放类型的特征。）Theprimarvroleofp「o・drainageistoreducethegascontentofthecoalseamtobeextractedtolessthantheprescribedThresholdLimitVValue仃LV）・（掘进巷道前期瓦斯抽放技术的首要任务是限制矿井中的气体含量，使其小于规定的阈值仃LV）O）1

6、BACKGROUNDTheuseofroutinedrillingprogramsforgasdrainagebeganinAustraliain1980andquicklyspreadamongthegassyminesinbothNewSouthWalesandQueensland.（瓦斯抽放的常规钻井程序在澳大利亚开始于1980年，并且在新南威尔士和昆士兰富含瓦斯的矿井中迅速普及。）lnadditiontotheinseamdrillingforpro・drainagesigrdficantattentionisalsogiventopost・drainagega

7、scapturemethods』煤层内部钻孔除了高度注重掘进巷道前期瓦斯抽放外还给出了长壁开采掘进过程实瓦斯吋抽放的瓦斯收集方法。）insuchsituationsthegasconcentrationsinthemineairwaysexceedstheprescribedstatutorylimitresultinginaproductiondelayuntilsuchtimeastheconcentrationisreduced』在这种情况F,巷道中的瓦斯含量超过了规定的浓度，直到瓦斯浓度降低才能进行生产作业，这样就会导致生产延误。