ORIGINALARTICLE

Thee ectofdeepexcavation-inducedlateralsoilmovementsonthebehaviorofstripfootingsupportedonreinforcedsand

MostafaElSawwaf*,AshrafK.Nazir

StructuralEngineeringDepartment,FacultyofEng.,TantaUniversity,Tanta,EgyptReceived28August2011;revised13October2011;accepted2November2011Availableonline3December2011

KEYWORDS

Granularsoilreinforcement;Stripfooting;

Footingloadlevel;Settlement;

Deepexcavation

AbstractThispaperpresentstheresultsoflaboratorymodeltestsonthein uenceofdeepexca-vation-inducedlateralsoilmovementsonthebehaviorofamodelstripfootingadjacenttotheexca-vationandsupportedonreinforcedgranularsoil.Initially,theresponseofthestripfootingssupportedonun-reinforcedsandandsubjectedtoverticalloads(whichwereconstantduringthetest)duetoadjacentdeepexcavation-inducedlateralsoilmovementwereobtained.Then,theeffectsoftheinclusionofgeosyntheticreinforcementinsupportingsoilonthemodelfootingbehaviorunderthesameconditionswereinvestigated.Thestudiedfactorsincludethevalueofthesustainedfootingloads,thelocationoffootingrelativetotheexcavation,theaffecteddepthofsoilduetodeepexcavation,andtherelativedensityofsand.Testresultsindicatethattheinclusionofsoilrein-forcementinthesupportingsandsigni cantlydecreasesbothverticalsettlementsandthetiltsofthefootingsduetothenearbyexcavation.However,theimprovementsinthefootingbehaviorwerefoundtobeverydependentonthelocationofthefootingrelativetoexcavation.Basedonthetestresults,thevariationofthefootingmeasuredverticalsettlementswithdifferentparametersarepresentedanddiscussed.

ª2011CairoUniversity.ProductionandhostingbyElsevierB.V.Allrightsreserved.

Introduction

Inurbanareas,therearemanysituationswherebasementcon-structionorundergroundfacilitiessuchascut-and-covertun-nelsareproposedtobeconstructedadjacenttooldbuildings.Ofgreatestconcernarebuildingswithshallowfoun-dationsthatdonotextendbelowthezoneofin uenceoftheadjacentexcavation.Duetothegreaterdepthofthefounda-tionlevelofthenewbuildingbelowtheexistingfoundationle-veloftheoldbuilding,http://www.wendangwang.commonlyadoptedwalltypesincludecontiguouspiles,secantpiles,sheet

*Correspondingauthor.Tel./fax:+20403352070.

E-mailaddress:Mos_sawaf@http://www.wendangwang.com(M.ElSawwaf).

2090-1232ª2011CairoUniversity.ProductionandhostingbyElsevierB.V.Allrightsreserved.

PeerreviewunderresponsibilityofCairoUniversity.doi:

10.1016/j.jare.2011.11.001