earth slip at excavation site外语英文电子书

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1、EARTHSLIPATEXCAVATIONSITETypeofbuildingworkTheprojectinvolveserectionof4unitsof2-storeyterracehouseeachwithabasement.Therewasa2.3mhighearthretainingrubblewallattheboundarywiththeadjacenthouse.Anopen-cutwithaslopewasadoptedfortheexcavation,andtheslope

2、wasprotectedwithalayerof300mmthickmassconcrete.Figure1:ExcavationwascarriedoutnearthebaseofexistingrubblewallWhatwentwrongWhenthesitewascutdownby2.7m,aslipdevelopedcausingtheexistingrubbleretainingwalltorotateandtumbledown.Theboundarywalloftheadjacen

3、thouseandtheperimeterdrainwerealsodamaged.Figure2:Thefailedrubbleretainingwall08-EarthslipatexcavationsitePg.1of2Investigationsrevealedthatthecontractorhadexcavatedforpilecapsalongthewholelengthatthefootoftheslope,insteadofasmallstretchatatime.Thedes

4、ignalsodidnottakeintoaccountweakeningofthesoilduetorain.Learningpointsa)Precautionarymeasuresmustbeputinplacetopreventdeteriorationofslopeduetoweather.b)Ifthedesignnecessitatesaparticularsequenceofconstruction(suchasexcavationofpilecapinaspecificsequ

5、ence),thisshouldbeclearlyshownonthedrawings.c)Theprofessionalengineershouldvisitthesiteregularlytoconfirmthattheconstructionsequenceisinaccordancewiththedesignassumption,andthesitesupervisorshouldbevigilanttoensurethatprecautionarymeasuresareputinpla

6、ce.d)Iftheexcavationiscarriedoutnearthebaseofanexistingearthretainingstructure,acheckonpossiblereductioninpassiveresistancemustbecarriedout.e)Soilparametersshouldtakeintoaccountthemostseveresituation.f)Designmustcaterforloadingconditionduetoover-exca

7、vation.08-EarthslipatexcavationsitePg.2of2