基础及基础工程外文翻译Word格式.docx
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基础及基础工程外文翻译Word格式.docx
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土木工程
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外文出处:
GEOLOGLCALANDGEOTECHNICALENGINEERING
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1、外文原文(复印件)
FoundationAndFoundationEngineering
Strucuresorotherconstructedworksaresupportedontheearthbyfoundation.Theword“foundation”maymeantheearthitself,somethingplacedinorontheearthtoprovidesupport,oracombinnationoftheearthandtheelementsplacedonit.Thefoundationforamultistoryofficebuildingcouldbeacombinationforanearth-filldamwouldbethenaturalsoilorrockonwhichthedamisplaced.Concretefootingsorwhichorinwhichtheyareplaced.Theinstalledelementsandthenaturalsoilorrockoftheearthformafoundationsystem;
thesoilandrockprovidetheultimatesupportofthesystem.Foundationthatareinstalledmaybeeithersoil-bearingorrock–bearing.Thereactionsofthesoilorrocktotheimposedloadsgenerallydeterminedhowwellthefoundationsystemfunctions.Indesigningtheinstalledportions,thedesignermustdeterminethesafepressuewhichcanbeusedonthesoilorrockandtheamountoftotalsettlementanddifferentialsettlementwhichthestructurecanwithstand.
Theinstalledpartsofthefoundationsystemmaybefootings,matfoundations,slabfoundations,andcaissonsorpiles,allofwhichareusedtotransferloadfromasupersteuctureintotheearth.Theseparts,whichtransmitloadfromthesuperstructuretotheearth,arecalledthesubstructure.
FootingFootingorspreadfoundationsareusedtospreadtheloadsfromcolumnsorwallstotheunderlyingsoilorrock.Normally,footingsareconstructedofreinforedconcrete.However,undersomecircumstancestheymaybeconstructedofplainconcreteormasonary,wheneachfootingsupportsonlyonecolumn,itissquare.Footingssupportingtwocoumnsarecalledcombinedfootingsandmaybeeitherrectangularortrapezoidal.Cantileverfootingsareusedtobuildinglineorexteriorwall.Footingssupportsingwallsarecontinuousfootings.
Thesizesoffootingsaredeterminedbydividingtheloadstobeimposedatthebaseofthefootingsbytheallowablebearingpressurewhichcanbeimposedonthesoilorrockoftheearth.Mostbuildingcodesandtextbooksonfoundationscontaintableslistingallowablebearingpressuresforvarioustypesofsoilandrock;
however,thesetablesgiveonlygeneralclassificationsanddescriptionsofthesoilorrockmustbeusedwithcaution.Morespecificinformationaboutthesoilorrockisnormallyobtainedbydrillingtestborings,extractingsoilorrocksamples,performinglaboratorytestsonthesamples,andmakingengineeringmustbegiventotheamountofsettlementwhichmayoccurandthecapabilityofthestructuretowithstandsuchsettement.Ifsettlementisproblemitmaybenecessarytouseanalternatefoundationtyperatherthanfootingsortoenlargethefootingsanddecreasethebearingpressure.
Gradebeamsmaybeusedbetweenexteriorcolumnfootingstosupportwalls,withthebeamstransferringtheweightofthewallstothecolumnfootings.Beamsarealsousedbetweeninteriorcolumnfootingstoactasbracesortosupportinteriorwalls.Retainingwallsarethosewallssubjecttohorizontalearthpressuresduetotheretentionofearthbehindthem.Thefoundationforthesewillnotslidewhensubjectedtothehorizontalearthpressure.Inaddition,retainingwallsmustbedesignedsotheywillnotoverturn.Infrost-susceptibleareas,footingsmustbeplacedbelowthefrostline.
MatfoundationsMatorraftfoundationsarelarge,thick,andusuallyheavilyreinforcedconcretematswhichtransferloadsfromanumberorcolumsandwallstotheunderlyingsoilorrock.Matsarealsocombinedfootings.,butaremuchlargerthanafootinguniformpressuretotheunderlyingsoilorrock.Matsarerigidandwillactasabridgeoverdiscontinuitiesinthesoilorrockonwhichtheyarefounded.Matsfoundedseveralmetersbelowthegroundsurface,whencombinedwithexternalwalls,aretermedfloatingfoundations.Theweightofthesoilexcavatedfromthegroundsurfacetothebottomofthematmaybeequaltoapproachthetotalweightofthestructure.Inthiscase,littleornonewloadisappliedtotheunderlyingsupportingsoil,andsettlementsofastructuremaybeminimalafterconstruction.
SlabfoundationsSlabfoundationsareusedforlightstructureswhereinthecolumnsandwallsaresupportesdirectlyonthefloorslab.Thefloorslabisthickenedandmoreheavilyreinforcedattheplaceswherethecolumnandwallloadsareimposed.
SpecialproblemsGroundwaterisamajorprobleminconnectionwiththedesignandinstallationoffoundationswhereasubstructureistobeplacedbelowthegroundwaterlevel.Wellpoints,pumpingfromde
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