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1、第35卷增刊2巖土力學(xué)Vol.35Supp.22014年10月RockandSoilMechanicsOct.2014文章編號:1000-7598(2014)增2-0460-07大采高綜放面區(qū)段煤柱合理留設(shè)研究孔德中,王兆會,李小萌,王顏亮,王闖(中國礦業(yè)大學(xué)(北京)資源與安全工程學(xué)院,北京100083)摘要:側(cè)向支承壓力分布、資源回收率以及煤柱和巷道的穩(wěn)定性是大采高綜放面區(qū)段煤柱寬度留設(shè)要兼顧的因素,為了確定大采高綜放面區(qū)段煤柱寬度,以某礦8103面為工程背景,首先,采用理論計算和現(xiàn)場應(yīng)力監(jiān)測等方法確定大采高綜放工作面傾向支承壓力
2、分布規(guī)律,得出應(yīng)力降低區(qū)寬度約為8m,原巖應(yīng)力區(qū)為巷幫側(cè)28m外。其次,采用工程類比方法確定大采高綜放工作面巷幫外側(cè)煤體嚴(yán)重破裂區(qū)寬度約為4m。最后,采用FLAC3D數(shù)值軟件分析了下區(qū)段工作面回采時窄煤柱(6、8m)和寬煤柱(28、30m)的應(yīng)力場、位移場及塑性區(qū)特征,獲得不同煤柱寬度時巷道和煤柱力學(xué)特征。研究表明:當(dāng)煤柱寬度6m和8m時,在采動支承壓力下煤柱幾乎無承載能力,且巷道變形量較大;當(dāng)煤柱寬度28m和30m時,在采動支承壓力下煤柱中央仍有一定的彈性核,煤柱保持穩(wěn)定且巷道變形量較小。綜合考慮資源回收、巷道穩(wěn)定性、次生災(zāi)害控制
3、等因素,確定大采高綜放工作面區(qū)段煤柱寬度為28m。關(guān)鍵詞:大采高綜放;傾向支承壓力;區(qū)段煤柱;數(shù)值模擬中圖分類號:TD45文獻(xiàn)標(biāo)識碼:AStudyofreasonablewidthoffull-mechanizedtop-coalcavingwithlargeminingheightKONGDe-zhong,WANGZhao-hui,LIXiao-meng,WANGYan-liang,WANGChuan(FacultyofResourcesandSafetyEngineering,ChinaUniversityofMiningand
4、Technology(Beijing),Beijing100083,China)Abstract:Thesideabutmentpressuredistribution,theresourcesrecovery,thestabilityofcoalpillarandtheminingroadwayareconsideredindeterminingreasonablewidthoffull-mechanizedtop-coalcavingwithlargeminingheight.Inordertodeterminethereaso
5、nablewidth,takingthe8103mineastheengineeringbackground,firstly,thesideabutmentpressuredistributionoffull-mechanizedtop-coalcavingwithlargeminingheightisstudiedbyusingstressmonitoringandtheoreticalcalculation;and8minwidthoflowstresszone,morethan28minwidthoforiginalrocks
6、tresszonearedetermined.Secondly,thewidthoffracturedzoneinsidecoalmassoffull-mechanizedtop-coalcavingwithlargeminingheightisdeterminedbyusingengineeringanalogyandnumericalsimulation,andabout4minwidthoffracturedzoneisdetermined.Finally,thestress,thedeformationandfracture
7、anddisplacementofthegatewayexcavatingandthecoalpillarsunderdifferentwidthsofcoalpillarsaresimulatedbyFLAC3D.Thestudyresultsshowthatthecoalpillaralmosthavenobearingcapacityandtheroadwayhaslargedeformationandfailureundertheinfluenceofminingabutmentpressurewhenthewidthofs
8、egmentpillaris6mor8m;thecoalpillarhasthestrongerbearingcapacityandtheroadwayhassmalldeformationandfailureundertheinfl