Page 173 - 《水资源与水工程学报》2022年第5期
P. 173
! 33 " ! 5 # & ' ( ) & * + , - Vol.33No.5
2022 $ 10 % JournalofWaterResources&WaterEngineering Oct.,2022
DOI:10.11705/j.issn.1672-643X.2022.05.21
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HIJKL:U455 MNOPQ:A MRSL:1672643X(2022)05016907
Influenceofwatercontentonstabilityofsurroundingrockof
carbonaceousslatetunnelwithhighgeostress
HUTaotao,GEJunkai,LIUKemeng
(SchoolofHighway,Chang’anUniversity,Xi’an710064,China)
Abstract:Whenthetunnelpassesthroughtheareaofweaksurroundingrockwithhighgeostressandrich
water,itispronetoallsortsofadversities,suchascollapses,initialsupportstructureintrusion,distortion
anddetachmentofsteelframes.Inviewofthisproblem ,MuzhailinghighwaytunneloftheWeiyuan-Wudu
3D
Expresswayistakenasthestudyobject,andthefinitedifferencemethodsoftwareFLAC wasusedtoes
tablishthenumericalsimulationmodelofthetunnelwithtwoconstructionmethodsunderdifferentwater
contents ,namely,thedoublesideheadingmethodandthreelevelsevenstepexcavationmethod.Thedis
tributionanddevelopmentofsurroundingrockpressure ,verticalandhorizontaldisplacementandplastic
zonewiththeincreaseofthewatercontentwereanalyzedanddiscussedunderthetwoconstructionmethods.
Theresultsshowthatwiththeincreaseofthewatercontent ,thestrengthofthecarbonaceousslatede
creased ,sodidtheselfstabilityofthesurroundingrock,whichinturnaffectedthestabilityofthetunnel.
Aftertheexcavationoftheupperlevelofthetunnel,thesettlementandconvergencedeformationofthekey
partsofeachmonitoringsectioninthesoftsurroundingrocksectionacceleratedandexpanded.Withtheap
plicationofinitialsupport ,thesettlementandconvergencedeformationspeedgraduallyeased,andstabi
lizedatthedistanceof50metersawayfromthetunnelface.
Keywords:carbonaceousslatetunnel;watercontent;highgeostress;numericalsimulation;stabilityoftu
unelsurroundingrock
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