欢迎来到天天文库
浏览记录
ID:5293864
大小:939.99 KB
页数:5页
时间:2017-12-07
《不等长工作面覆岩破坏规律的数值模拟分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第33卷第4期安徽理工大学学报(自然科学版)Vo1.33No.42013年12月JournalofAnhuiUniversityofScienceandTechnology(NaturalScience)Dee.2013不等长工作面覆岩破坏规律的数值模拟分析高明中,王新丰(安徽理工大学能源与安全学院,安徽淮南232001)摘要:针对不等长工作面煤层开采日渐增多的现状,采用数值模拟与理论分析相结合的方法,对采场覆岩的破坏特征及支承压力的分布状态进行系统研究,并相应模拟出工作面前方应力场与位移场的演化规律。结果表明:工作面自开切眼开始向前推移,
2、推进到工作面“见方”期或斜长的整数倍位置时,顶板活动剧烈,覆岩空间结构发生新旧更替,形成了“0”型破断区;不等长工作面推进过程中岩层运移极不规则,推进距离在衔接面前后2O~30m的范围内,应力波动较大,数值变化明显;回采期间支承压力对覆岩活动产生了重要影响,其大小约为水平应力的1.5~2倍;就采动过程中竖向位移的变化而言,巷帮移近量远大于顶底板变形量,故工程实践中应特别注意对巷帮及顶板的加固和维护。关键词:不等长工作面;覆岩破坏;数值模拟;位移场;演化规律中图分类号:TD821文献标志码:A文章编号:1672—1098(2013)04—00
3、32—05NumericalSimulationAnalysisofOverburdenFailureinWorkingFaceofUnequalLengthGAOMing—zhong,WANGXin—feng(SchoolofEnergyandSafety,AnhuiUniversityofScienceandTechnology,HuainanAnhui232001,China)Abstract:Inviewofthepresentsituationofcoalminingworkingfaceofunequallengthincrea
4、singdaybyday,miningdamagecharacteristicsofoverlyingrocksandthedistributionofabutmentpressureweresystematically.studiedbyusingthemethodsofnumericalsimulationandtheoreticalanalysis,andtheevolutionofstressfieldanddisplacementfieldinfrontofworkingfaceweresimulated.Theresultssh
5、owedthatwhenworkingfacefromopen—offcutadvancestopositionofequalslopelengthoranintegermultipleoftheslopelength,roofmovesin—tensively,inoverlyingstrataoldandnewspatialstructureexchanged,and”O”typefracturezonewasformed.Stratabehaviorswereextremelyirregularintheprocessofworkin
6、gfaceadvance,withintherangeof20to30me—tersbeforeandafterthecontactingsurfacestressfluctuationwasbig,anditsvalueschangedsignificantly.Duringprocessofminingabutmentpressurehadasignificantimpactontheoverlyingstratabehavior,anditsvalueisap—proximately1.5to2timesofhorizontalstr
7、ess.Duringtheminingprocessverticaldisplacementinside—wailsofroadwayismuchlargerthanthedeformationofroofandfloormovementtoeachother,SOinengineeringpracticeparticularattentionshouldbepaidtoside—wallsofroadwayandroofreinforcementandmaintenance.Keywords:unequallengthworkingfac
8、e;overburdenfailure;numericalsimulation;displacementfield;evolutionlaw随着矿井开采深度的增加和采掘机械化程度
此文档下载收益归作者所有