The effect of deep excavation-induced lateral soil movements
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