Page 196 - 《水资源与水工程学报》2022年第3期
P. 196
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ofventilation,thetemperaturestressplaysaleadingroleinthestresschangeofthecouplingstructure.
After21days ,thejointcouplingeffectofliningsupportreaction,surroundingrockpassivesupportreac
tionandsurroundingrockboundaryconstraintshouldbeconsidered.48daysbeforetheconvection,the
innersideofthestructurewasstrained ,andthemaximumtensilestressof155kPaoccurredintheinner
sideofthearchwaist.After48days,thecompressivestressofthestructureincreasedrapidly,andthe
couplingstressincreasedatthehighestratefrom48to60days.Withthedecreaseofthetemperature,
thetensilestressofarchroofandbottomincreasedsharplyat-1.95℃,andthenstartedtodecrease
slowlyat-3.5℃.Thisstudyrevealsthewholedynamicprocessofsurroundingrock-supportingstruc
tureinteractionunderthermalaction ,whichcanprovideatechnicalsupportforthesafeconstructionof
tunnelsincoldregions.
Keywords:hydraulictunnel;surroundingrock-supportingstructurecoupling;thermal-mechanical
action;mechanicalproperty;interactionmechanism;numericalsimulation
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