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Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
K. Sweta and S K K Hussaini.  
Corresponding Authors:
S K K Hussaini 
DOI #:
https://doi.org/10.1016/j.geotexmem.2018.09.002 
Title:
Behavior evaluation of geogrid-reinforced ballast-subballast interface under shear condition.  
Journal:
Geotextiles and Geomembranes.  
Year:
2019 
Volume:
47(1), 
Page:
23-31  
Keywords:
Geosynthetics, Ballast-subballast interface, Large-scale direct shear test, Rate of shearing, Friction angle, Interface efficiency factor 
Abstract:
Theeffectivefunctioningofarailwaytrackunderoperatingconditionsdependslargelyontheperformanceofvariousrailtrackinterfaces(e.g.ballast-subballastinterface,subballast-subgradeinterface).Inthiscontext,aseries of large-scaledirect shear tests were conducted to investigate the shearbehavior of unreinforced andgeogrid-reinforcedballast-subballastinterfacesatdifferentnormalstresses(σn)andratesofshearing(Sr).Freshgraniteballastandsubballasthavingaverageparticlesize(D50)of42mmand3.5mmrespectively,andfivegeogridswithdifferent apertureshapesandsizeswere usedinthisstudy.Tests were performed at differentnormalstresses(σn)rangingfrom20to100kPaandshearingrates(Sr)rangingfrom2.5to10.0mm/min.Thelaboratorytestresultsconfirmedthattheshearstrengthofballast-subballastinterfacewashighlyinfluencedbytheappliednormalstress(σn)andrateofshearing(Sr).Thefrictionangle(φ)ofunreinforcedballast-subballastinterfacewasfoundtodecreasefrom63.24°to47.82°anddilationangle(ψ)from14.56°to5.23°asthevaluesofσnandSrincreasedfrom20to100kPaand2.5–10.0mm/min,respectively.Further,thebreakageofballast(Bg)was found to increase from 2.84 to 6.69%. However, geogrid inclusions enhanced theshear strength of theballast-subballastinterfaceandalsoreducedtheextentofBg.Theresultsindicatethatitispossibletoestablisharelationshipbetweenthefrictionangle(φ)andbreakageofballast(Bg),whereinthefrictionangle(φ)ofbothunreinforcedandgeogrid-reinforcedinterfacesreduceswiththeincreaseinbreakage(Bg).Theinterfaceeffi-ciencyfactor,definedastheratiooftheshearstrengthofthegeogrid-reinforcedballast-subballastinterfacetotheoriginalshearstrengthofballast-subballastinterfacevariesfrom1.04to1.22.Moreover,thecurrentstudyrevealedthattheshearbehaviorofballast-subballastinterfacewasinfluencedbygeogridaperturesize(A). 
Entered by:
Venkata Dantham on 2020-08-03 
 
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