tsuchsoilofspecialgroundasthesoil,loess,expandingintheland,etc.,pressoutofshapetostrengthen.Inthesoftsoilground,seasoncausesthewatertabletodroptodrawwateroraridartificially,thegroundsoillayerconsolidatesandsinksagain,reducethebuoyancyonthefoundationatthesametime,shoulderingtheobstructionofrubingtoincrease,thefoundationiscarriedonone'sshoulderorbackandstrengthened.Somebridgefoundationisitputtooshallowtobury,erode,isitdigtowashflood,thefoundationmightbemoved.Groundloadchangeofterms,bridgenearbyisitisitabolishsquare,grit,etc.inalargeamounttoputtopilewithcavein,landslide,etc.reasonforinstance,pressedagain.So,theconditionoforiginalgroundchangewhileusingmaycauseanddoesnotsubsideevenlyProducethestructurethingofhorizontalthrusttoarchedbridge,etc.,pletely,designandconstructinthegeologicalsituation.
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