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1、第33卷第7期巖石力學(xué)與工程學(xué)報(bào)、b1.33No.72014年7月ChineseJournalofRockMechanicsandEngineeringJu/y,2014不同穩(wěn)定時(shí)間對(duì)煤的變形及滲透特性影響試驗(yàn)研究許江~,張敏。,李波波~,杜偉,周婷。,曹偈,(1.重慶大學(xué)煤礦災(zāi)害動(dòng)力學(xué)與控制國家重點(diǎn)實(shí)驗(yàn)室,重慶400044;2.重慶大學(xué)復(fù)雜煤氣層瓦斯抽采國家地方聯(lián)合工程實(shí)驗(yàn)室重慶400044;3.重慶市北碚區(qū)國土資源管理分局,重慶400700)摘要:為探討在采動(dòng)應(yīng)力反復(fù)擾動(dòng)下煤的變形及滲透特性,利用自主研發(fā)的含瓦斯煤巖熱流固耦合三軸伺服滲流裝置,進(jìn)行不同穩(wěn)定時(shí)間條件下煤的循環(huán)荷載試驗(yàn)
2、。研究結(jié)果表明:(1)不同穩(wěn)定時(shí)間條件下煤的循環(huán)加卸載應(yīng)力一應(yīng)變曲線不相重合,形成塑性滯回環(huán);隨著穩(wěn)定時(shí)間的增加,滲透率有相同的變化趨勢(shì),初始滲透率下降幅度亦減小。滲透率與軸向應(yīng)變隨主應(yīng)力差增加呈負(fù)相關(guān)變化,軸向應(yīng)變?cè)龃鬂B透率減小,反之亦然。(2)煤的軸向應(yīng)變最大值隨穩(wěn)定時(shí)間增加先減小后增大,并在穩(wěn)定時(shí)間為100S時(shí)到達(dá)最小:滲透率最小值隨穩(wěn)定時(shí)間增加先增大后減小,并在穩(wěn)定時(shí)間為100S時(shí)到達(dá)最大。煤的滲透率變化與軸向變形的發(fā)展密切相關(guān)。(3)不同穩(wěn)定時(shí)間條件下煤的滲透率變化均滯后于體積應(yīng)變變化,且隨穩(wěn)定時(shí)間的增加,滯后量有增大的趨勢(shì)。關(guān)鍵詞:巖石力學(xué):循環(huán)荷載;穩(wěn)定時(shí)間;滲透率;滯后
3、性中圈分類號(hào):Tu45文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000—6915(2014)07—1388—10EXPERIMENTALRESEARCHoNDEFoRMATIoNANDPERMEABILITYCHARACTERISTICSoFCoALATDIFFERENTSTABILITYTIMESXUJiang,2ZHANGMin2LIBobo2,DUWei,ZHOUTing’。,CAOJiel,,(1.StateKeyLaboratoryofCoalMineDisasterDynamicsandControl,ChongqingUniversity,Chongqing400044,China;2.
4、StateandLocalJointEngineeringLaboratoryofMethaneDrainageinComplexCoalGasSeam,ChongqingUniversity,Chongqing400044,China;3.TheBranchBureauofLandandResourcesManagementofBeibei,Chongqing400700,China)Abstract:Tostudythecharacteristicsofdeformationandpermeabilityofcoalsunderrepeateddisturbanceofs~esse
5、s,cyclicloadingtestswithdiferenttimelengthsofstabilizationwerecarriedoutusingaservocOn仃oiledtriaxialseepagedevicewhichwasdevelopedinhouse.Theloadingandunloadingstress—straincurveswithdiferenttimelengthsofstabilizationformplastichysteresisloops.Asthetimelengthsofstabilizationincreased,theinitialp
6、ermeabilityreducedslowlybutthetrendsofvariationofthepermeabilityremainedthesame.Thepermeabilitydecreasedwiththeincreasingoftheprincipalstress.Themaximumaxialstrainofcoaldecreasedinitiallyandthenincreasedasthetimelengthsofstabilizationincreasedanditreachedtheminimumvalueatthetimelengthsofstabiliz
7、ationof100S.Theminimumpermeabilityofcoalincreasedinitiallyandthendecreasedanditreachedthemaximumvalueatthetimelengthsofstabilizationof100S.Thepermeabilitiesofcoalsare牧藕8期l2013—08—3O;'.I回日期l2014—02—26基金項(xiàng)目t重慶市基礎(chǔ)與前沿研究計(jì)劃項(xiàng)I~1(cst