Page 159 - 《水资源与水工程学报》2023年第5期
P. 159
! 34 " ! 5 # & ' ( ) & * + , - Vol.34No.5
2023 $ 10 % JournalofWaterResources&WaterEngineering Oct.,2023
DOI:10.11705/j.issn.1672-643X.2023.05.18
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EFGHI:U416.2 JK7LM:A JNOI:1672643X(2023)05015510
Studyonmesomechanicalparametersofgradedcrushedstone
from tunnelwasteslagbasedonCBRtest
1
1
1
1
2,3
YUEXiabing,HUANGJiao,DINGTong,WANGYiding,WANGXueying
(1.SchoolofHighway,Chang’anUniversity,Xi’an710064,China;2.InnerMongoliaResearchInstituteofTransportation
ScienceDevelopment ,Hohhot010051,China;3.KeyLaboratoryofTransportIndustryofManagement,Controland
CycleRepairTechnologyforTrafficNetworkFacilitiesinEcologicalSecurityBarrierArea,Hohhot010051,China)
Abstract:Gradedcrushedstoneiswidelyusedasthebasefillerofexpresswaypavement.Asanimpor
tantmeanstodeterminethestrengthofsubgradesoilandpavementmaterials,CaliforniaBearingRatio
(CBR)testcanreflecttheactualbearingcapacityofthesubgradeorpavementstructurelayer.Basedon
3D
theparticleflowsoftwarePFC ,theinfluenceofmesoscopicparametersontheCBRtestisstudied.With
3D
thehelpoftheforcechainmodelinPFC ,theinternalforceevolutionprocessofthesampleisobserved,
andtheinfluenceofparticlemicroscopicparameterssuchasparticlestiffnessratiok/k,frictioncoeffi
n s
cient μ ,normalbondstrengthT andtangentialbondstrengthS onthetestresultsisdiscussed.There
σ σ
sultsshowthatk/khasnosignificanteffectontheCBRvalue, μ andT bothhavealinearpositivecorre
n
σ
s
lationwiththeCBRvalue.Then ,theinfluenceofnormalandtangentialbondstrengthontheCBRtest
resultsiscomparedusingthebondstrengthratio T /S.ItisfoundthatS hasasignificantimpactonthe
σ σ σ
CBRvalue,itmainlydeterminesthetangentialplasticityofthecontactkey,whereasT mainlycontrols
σ
itssurfacenormaladhesion.
Keywords:tunnelingengineering;tunnelwasteslag;gradedcrushedstone;CaliforniaBearingRatio
(CBR)test;particleflowsimulation;mesomechanicalparameter
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