Page 188 - 《水资源与水工程学报》2022年第1期
P. 188
!33 " ! 1 # & ' ( ) & * + , - Vol.33No.1
2022 $ 2 % JournalofWaterResources&WaterEngineering Feb.,2022
DOI:10.11705/j.issn.1672-643X.2022.01.26
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Timevaryingradialdisplacementsolutionintheplasticzoneofthecircular
roadwayunderconstantbiaxialstressandanalysisofrockburstprevention
1
1,2
1
1
1
FANBaojie ,ZHAOFujun,WUQiuhong,LIUYonghong,WANGBin
(1.SchoolofResources&EnvironmentandSafetyEngineering,HunanUniversityofScienceandTechnology,Xiangtan411201,China;
2.HunanInstituteofCityGeologicalSurveyandMonitoring,Changsha410000,China)
Abstract:Themechanicalprocessoftheelasticandplasticzoneofthesurroundingrockthatchangeover
timeundertheactionofconstantbiaxialstressloadisanalyzedusingthetimevaryingtheory.Aplane
strainmodelofthecircularroadwayisestablishedtoobtaintheelastictimevaryingsolution,elastoplastic
timevaryingsolutionandtimevaryingradialdisplacementsolutionintheplasticzoneusingthebilinear
constitutiveequationsoftheelasticzoneandplasticzone.Theresultsshowthatwhentheboundarymove
mentrateoftheplasticzonewasrelativelylarge ,theradialdisplacementintheplasticzoneincreased
withtime.Thelargertheroadwayradius ,thegreatertheradialdisplacementintheplasticzoneatthe
samemoment.Inessence,thetimeeffectofrockburstisthattheradialdisplacementintheplasticzone
ofthesurroundingrockreachesthecriticalsofteningdepth.Topreventtherockburst ,theradialdisplace
mentoftheplasticzoneshouldbereducedasfaraspossible.Thetimevaryingradialdisplacementsolu
tionintheplasticzoneprovidesanewideaforthepreventionandcontrolofrockbursts.
Keywords:timevaryingmechanics;circularroadwayunderconstantbiaxialstress;elastoplastictime
varyingsolution ;timevaryingradialdisplacementsolution;rockburstprevention
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