不同围压巷道开挖应力场演化规律模拟试验研究林健

4010Vol．40No．10201510JOUＲNALOFCHINACOALSOCIETYOct．2015．J．201540102313－2319．doi10．13225/j．cnki．jccs．2015．6001LinJianWangYangYangJingheetal．Simulationstudiesonstressfieldevolutionofroadwayexcavationunderdifferentconfiningpres-suresJ．JournalofChinaCoalSociety201540102313－2319．doi10．13225/j．cnki．jccs．2015．600112121212121．1000132．100013、、。“——”。“———”、。TD322A0253－9993201510－2313－072015－08－15U12612112012BAK04B062013MS0101969—。[e-mail]ressfieldevolutionofroadwayexcavationunderdifferentconfiningpressuresLINJian12WANGYang12YANGJing-he12WANGZheng-sheng12CAIJia-fang121．CoalMiningandDesigningDepartmentTiandiScienceandTechnologyCo．Ltd．Beijing100013China2．CoalMiningandDesigningBranchChinaCoalＲesearchInstituteBeijing100013ChinaAbstractAmodelofmineroadwaywasconstrainedontheboundarybyhome-mademoldloadedbymicrocomputercontrolelectro-hydraulicservouniversaltestingmachineinlaboratory．Thusthecoalmimeroadwayexcavationwassim-ulatedbyunloadingthefrontconstraintplateofmodel．Thevariationcharacteristicsofaxialstressbeforeandaftertheexcavationofcoalseamwithdifferentstresseswereobtainedandalsotheroadwaysurroundingrockstressfieldvaria-tioncharacteristicsbeforeandafterexcavationunderlowsecondaryandhighstressconditionswerediscussed．There-sultsshowedthatthetensilestressareaneartheexcavationplanewasformedunderlowstressconditionbuttheinter-nalstressvaluesweresmallthewholesurroundingrockwasinelasticstatetheresistanceabilityofsurroundingrocktoexcavationdisturbancewasstrong．Undertheconditionofsecondarystressthetensilestressareaofsurroundingrockintheshallowfurtherexpandedwhichwascausedbymodelexcavationrockmassreachedyieldstatusandtheexca-vationdisturbanceofsurroundingrockwasstrongthestressfieldafterexcavationbegantopresent‘pull-pressure-pull’alternatephenomenon．Underthehighstressconditionthesurroundingrockobviouslyappearedasplasticandtherockmasswithinthemodelallappearedinastateoftension．Byexcavationdisturbancethesurroundingrocksur-201540facerapidreturnedtocompressionstateandmovedtodeepagainformingobvious‘pull-pressure-pull-pressure’dy-namicalternationphenomenondamagedepthofsurroundingrockwaslargertheabilitytoresistdisturbancewaspoorappeareddeepminingcharacteristics．Keywordsroadwayexcavatingstressfieldsevolution。。。。20。。1－5、、、、。6－。7。8。9。10。、11ＲFPA、。12。2、13。14－SHPB－。15。。。11.1JAW－1500kN。300mm×300mm×300mmCL1∶6Cγ1CE1∶6Cσ1∶6CF1∶216。20～30MPa3.3～5.0MPa。∶=1.5∶8.528d3.75MPa。1.2。300mm×300mm×150mm。1.3。62、、、4M24mm5mm、M24mm。15min。4132101。1－Fig.1Loadingandunloadingintest1.4、。2。3100300500kN1.13.35.5MPa6.619.833.0MPa。2Fig.2Loadingway1.52。1。。SZ120－3AA、3mm2mm120Ω。32070120mm21。60PYJZA－323。3Fig.3Straingaugelayoutinmodule2。。。YHD－100100mmk=200×10－6mm－1YJZA－16。2－Origin。2.1100kN100kN－4a5a。45。。3、。80mm。1/4。80mm0.37mm0.2MPa。6a51322015404100300500kNFig.4Axialstresschangecurvesof100300and500kNloadlevelunderlateralloadingandexcavation5100300500kNFig.5Stressdistributionnephogramof100300and500kNloadlevelafterlateralloadingandexcavation6132106100300kNFig.6Surfacedisplacementcurvesof100300kNloadlevelbeforeandafterexcavation。。。2.2300kN300kN－4b5b。5、、、。。85mm0.6MPa。85～150mm0.2MPa1.5MPa。。。0.75MPa70mm90mm0.7MPa1.75MPa。。300kN6b100kN0.1mm。。100kN。2.3500kN500kN－4c5c。2、。150mm。、1.25MPa0.02MPa190mm2MPa。、——。0.75MPa。190mm2.5MPa。。7132201540。。。——。、———。31。。2。。41、、、、。2。3。。“——”－。4。。“——”。、。1．M．2003．2．J．2001203338－341．LiJianlinMengQingyi．AnisotropicstudyofunloadrockmassJ．ChineseJournalofＲockMechanicsandEngineering2001203338－341．3．J．200322122032－2036．LinJianlinWangLehua．StudyonsizeeffectofunloadedrockmassJ．ChineseJournalofＲockMechanicsandEngineering200322122032－2036．4．J．200527137－39．ZhouJifangYangXuetangLiJianlinetal．AfurtherresearchonmacroscopicalmechanicalparametersofunloadingrockJ．Jour-nalofChinaThreeGorgesUniversityNaturalSciences200527137－39．5．J．2004266514－516．ZhouJifangLiJianlinChenXingzhou．ExperimentalconditionsforresearchingmechanicalcharacteristicsofunloadingrockJ．JournalofChinaThreeGorgesUniversityNaturalSciences2004266514－516．6．－J．200524183236－3245．ZhouXiaopingHaQiulingZhangYongxingetal．Analysisoflocali-zationofdeformationandcompletestress-strainrelationformeso-scopicheterogenousbrittlerockmaterialwhenaxialstressisheldconstantwhilelateralconfinementisreducedJ．ChineseJour-nalofＲockMechanicsandEngineering200524183236－3245．7．J．2002215626－631．ZhaoMingjieXuXibinXuＲong．Constitutivemodelofrockun-dertriaxialloadingandunloadingJ．ChineseJournalofＲockMe-chanicsandEngineering2002215626－631．8．J．200322122028－2031．ShenJunhuiWangLanshengWangQinghaietal．DeformationandfracturefeaturesofunloadedrockmassJ．ChineseJournalofＲockMechanicsandEngineering200322122028－2031．9．J．200429131－35．813210ChenZhonghuiLinZhongmingXieHepingetal．DamagestudyonbrittlerockfailureundercomplicatedstressJ．JournalofChinaCoalSociety200429131－35．10．J．200532481－82．DuanJinlinHuZhiyuYanLiyong．ＲesearchonsurroundingrockunloadingofundergroundcavityJ．JournalofHeilongjiangHy-draulicEngineeringCollege200532481－82．11．J．200926145－49．ZhangXiaojunJingHongwen．Analysisofexcavationdamageinhighlystressedsurrou