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1、第42卷第6期煤田地質(zhì)與勘探Vol.42No.62014年12月COALGEOLOGY&EXPLORATIONDec.2014文章編號:1001-1986(2014)06-0068-05新集礦區(qū)地應(yīng)力場特征研究121師修昌,鞠遠(yuǎn)江,孟召平(1.中國礦業(yè)大學(xué)煤炭資源與安全開采國家重點(diǎn)實(shí)驗(yàn)室,地球科學(xué)與測繪工程學(xué)院,北京100083;2.中國礦業(yè)大學(xué)資源與地球科學(xué)學(xué)院,江蘇徐州221116)摘要:礦井動力現(xiàn)象如巷道變形破壞、煤和瓦斯突出及煤層底板突水等都與地應(yīng)力密切相關(guān)。應(yīng)用水壓致裂法對新集礦區(qū)的原地應(yīng)力進(jìn)行了測量,確定原地系統(tǒng)深部圍巖的應(yīng)力狀態(tài),即原地應(yīng)力的量值和方向,研究獲得
2、了礦區(qū)地應(yīng)力的賦存規(guī)律和基本特征。測量結(jié)果分析表明:新集礦區(qū)地應(yīng)力場以水平應(yīng)力為主導(dǎo),屬于構(gòu)造應(yīng)力場類型;垂直主應(yīng)力和最大、最小水平主應(yīng)力均隨埋深的增加呈近似線性增加;最大水平主應(yīng)力與最小水平主應(yīng)力的比值范圍是1.01~1.29,反映新集礦區(qū)受構(gòu)造作用較恒定;測壓系數(shù)的范圍是0.98~1.3,隨深度變化不明顯;新集礦區(qū)受到F10斷層?xùn)|西向的拉張應(yīng)力,最大水平主應(yīng)力方向?yàn)榻麰W向。最后探討了原地系統(tǒng)不同構(gòu)造部位地應(yīng)力方向差異的原因,初步分析認(rèn)為,是受到阜鳳推覆體的影響。關(guān)鍵詞:新集礦區(qū);地應(yīng)力場;地質(zhì)構(gòu)造;阜鳳推覆體中圖分類號:TD311文獻(xiàn)標(biāo)識碼:ADOI:10.3969/j
3、.issn.1001-1986.2014.06.014Characteristicsofin-situstressfieldinXinjicoalmine121SHIXiuchang,JUYuanjiang,MENGZhaoping(1.StateKeyLaboratoryofCoalResourcesandSafeMining,CollegeofGeosciencesandSurveyingEngineering,ChinaUniversityofMiningandTechnology,Beijing100083,China;2.SchoolofResourceandEar
4、thScience,ChinaUniversityofMining&Technology,Xuzhou221116,China)Abstract:Minedynamicphenomenasuchasdeformationanddestructionofroadway,coal-gasoutburstandwaterinrushfromfloor,arecloselyrelatedtoinitialgroundstress.Thehydraulicfracturingmethodwasusedtomeasurein-situstressofXinjimine,confirmed
5、in-situstressstateofsurroundingrockindeepautochthonoussystem,themagnitudeandorientationofin-situstress,occurrenceregularityandessentialcharacteristicsofin-situstressinminingareahavebeenputforwardbythestudy.Theanalysisofmeasuringresultsindicated:thehorizontalstressdominatedthefieldstressofXi
6、njimineandhadobvioustectonicstressfeatures;Thevertical,maximumandminimumprincipalstresswouldbeincreasedwiththeminedepth,representedapproximatelineargrowth;Ratioofmaximumtominorhorizontalprincipalstressesrangedfrom1.01to1.29,Xinjiminingareawasrelativelyconstantundertheactionofgeologicstructu
7、re.Lateralpressurecoefficientrangedfrom0.98to1.3,changedinconspicuouslywithburialdepth;ThemaximumhorizontalprincipalstressesofXinjiminingareawasclosetoEWunderthefunctionofstretchingstressinEWdirectionoffaultF10.Atlast,thereasonfordifferencebetweenin-situ