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1、专业外语文献翻译（结课论文）院:级:名:学号:FI期:安全工程专业外语文献翻译评分标注评价项目评分标准得分排版（30分）格式完全符合模板要求满分，每一大项不符合Z处酌情扣分翻译质量（70分）翻译是否有错别字（10）专业术语、数字、统计学方法等翻译是否准确（30）语句通顺、连贯，符合中文表达习惯（30）总分（百分制）总评（五级制）评阅人:CharacteristicsofFractureCoalBodyCoalundertheStressLoadingandUnloadingProcessTIANK

2、un-yun(DepartmentofSaflyScicncc&Engincoring,HenanUniversityofEngineering,Zhengzhou451191,China)Abstract:Inordertoobtainthegaspermeabilitycharacteristicsofdifferentbeddingdirectionfracturedcoalundertheactionofstressloadingandunloading,theexperimentrese

3、archwascarriedoutemployingthreestressaxisgaspenetrationsimulationexperimentdevice・Theresultsshowedthatinthestressloadingprocess,thetrendaboutthistwokindsofbeddingfissurescoalbodywassimilar,whichthepenneabilitydecreasedwiththeincreaseofeffectivestress.

4、Thepenneabilityofthetwocoalsamplesdecreasedby99.01%and80.49%whentheeffectivestresswasloadedtothemaximumvalue・Inthestressunloadingprocess,permeabilityofthetwocoalsamplesincreasedwiththedecreaseofeffectivestress.Thepermeabilityofthetwocoalsamplesrecover

5、edto87.45%and68.8.5%oftheminimumvaluewhentheeffectivestressunloadedfrom11.65to8.98MPa.Permeabilityincreaseamplitudewas736.78%and99.67%whentheeffectivestresswas4.98MPa.TheincreaseamplitudeofDN1coalsamplewasmuchbiggerunderthesameunloadingcondition.There

6、searchresultscanprovidecertainreferenceforthegasdrainageboreholelayout,maximizingthethegasextractioneffect.Keywords:Loadingandunloading;Fracturecoalbody;Seepagecharacteristics;RawcoalsamplesThebeddingiswidelydistributedinthecoalseamanddeterminesthesta

7、bilityofcoalseamespeciallythegasflowstate[1].Integrityofcoalbodyisdestroyedbythebeddingfissures,meanwhile,thestressdistributionstateofcoalseamchangestoagreatextent[2],beddingfissuresisoneofthemaincontrolfactorsthatdeterminethestrengthofcoalbody,deform

8、ationandgaspermeabilitycharacteristics.Beddingfissurewilldevelop,penetrateevendeformateanddestructafterthemining-inducedinfluence,thishasagreatinfluenceonthegasseepageanddiffusion,directlydetenniningthecharacteristicsofgasmigrationandaccumulat