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不同三轴应力途径下红砂岩力学特性试验研究 Abstract:Thestrengthanddeformationcharacteristicsofredsandstoneunderdifferenttriaxialstressstateswerestudiedbycompressionandstraintestingunderdifferentialtriaxialstress.Theresultsshowthatthestrengthanddeformationcharacteristicsofredsandstonearesignificantlyaffectedbythetriaxialstressstate.Thefailuremodeofredsandstonechangesgraduallyfrombrittlefracturetoductiledeformationwiththeincreaseofconfiningpressure.Thepeakstrengthofredsandstoneincreaseswiththeincreaseofconfiningpressure,andthefailuremodeofredsandstonechangesfrombrittlefracturetoplasticdeformation.Thedrainedtriaxialcompressiontestresultsshowthatthestress-straincurveofredsandstoneishighlynon-linearunderdifferenttriaxialstressstates.Thestress-straincurveofredsandstoneunderdifferenttriaxialstressstatesisdifferent.Inthetest,whentheaxialstressislessthanthepeakstressofredsandstone,thedeformationofredsandstoneismainlycausedbytheslipdeformationbetweenparticles.Whentheaxialstressexceedsthepeakstressofredsandstone,thedeformationofredsandstonemainlyoccursintheformofcracks. Keywords:redsandstone,triaxialstress,strength,deformationcharacteristics 1.Introduction Redsandstoneiswidelydistributedinnatureandplaysanimportantroleinthegeologicalandminingfields.Tostudythemechanicalpropertiesofredsandstoneundercomplexstressconditions,itisofgreatsignificanceforgeologicalresearchandminingengineering.Inthispaper,triaxialstresstestswerecarriedoutonredsandstonesamplesunderdifferentstressconditions,andthestrengthanddeformationcharacteristicsofredsandstoneunderdifferentstressconditionswerestudied. 2.Experimentalprocedures 2.1Samplecollection TheredsandstonesamplesusedinthisexperimentwerecollectedfromaminingareainnorthernChina.Thesampleswerecollectedbycuttingoffthesurfacelayeroftherockusingadiamondsaw.Then,thesampleswereprocessedintostandardcylindricalsampleswithadiameterof50mmandaheightof100mm,andthesurfaceofthesampleswascarefullyprocessedtoensurethatthesampleshaveasmoothsurfaceandauniformdiameter. 2.2Experimentalappara