cketwasinstalledonastandardscraperwithhydrauliccontrol.Thetestprocedureprovidedforrecordingoftheinducedstressandthecompressedairconsumption.Theexperimentswereperformedingravellyclayandloam;thesoiltemperatureduringtheinvestigationswasbetween一and一C.Tocharacterizetheefficiencyofscraperoperation,wetookasuitableindex,namelythetotalspecificen-ergyconsumption,whichwasthesumoftheenergyconsumptiononbreakingthefrozenground,fillingthebucketwiththismaterial,and--shiftingthescraper.Theenergyconsumptionofimpact-breakingofthegroundconsistedofthespecificenergyconsumptiononshiftingtheworkingmemberFandtheenergyconsumptiononcompressedair,andwastheratioofthepowerconsumedNtoitsintensityi.TheintensityofbreakingofthegroundinthegivensectorwasdeterminedfromtheequationikSFFiVwhereFiandFkare,respectively,thecross-sectionalareasofthefracture"path"atthebeginningandendofthesectori-k,andVsisthespeedoftheworkingmem