Finite Element Analysis About Stress And Deformation Performance Of The Backfill To The Back Of Bridge Abutment

Bridge abutment is the important part of bridge, its stress and deformation have ainfluence directly on the bridge's service performance and the structure's endurance. Thedeformation and stability of the backfill to the back of abutment is a tickler hecklinghighway engineering department for ages. The deformation of abutment and backfillwill make the joint of road and bridge generate differential settlement, so it will createthe "bridge bump"phenomenon. It not only influences the speed and comfort in drivingbut also brings danger for driving safety and makes huge loss of the personnel casualtyand the society substance wealth. In order to offer safe, reliable, effective andcomfortable highway transition, it is important to study the problem about stress anddeformation to the back of backfill of abutment.Through investigating lots of actual projects, this article summarizes the principalengineering diseases of filling in back of abutment in road and analyses its genesis, itsummarizes the material filling in back of abutment its effect and the means to decreasesettlement of backfill. Meanwhile presents the preventive and curative measures ofdisease. Based on the special geological condition in Western, this thesis introduces theproperty of eolian sand and gravel macro-scope existing and proceeds numericalsimulation by utilizing ABAQUS finite calculation software. Depending on actual project,this article proceeds finite element numerical simulation to stress and settlementdeformation about different material as to bridge abutment filling in eolian sand, graveland light-weight ceramsite concrete according dimension of the actual project, andcompares analysis results. The outcomes of calculation and actual observation record arecoincident. It's result proves that as backfill eolian sand may live up to application andeffect is more powerful than gravel, the settlement of backfilling eolian is one half thangravel. So we can utilize directly eolian sand in backfill and obtain yield good economicreturns in Western. The conclusions can provide reliable theoretical standards andfoundation for design and construction about abutment backfill in future. At the sametime, the conclusions also indicate the effect of ceramaite concrete is most perfect thanothers, its settlement only is one eighth of gravel, it can decrease settlement in back filledregion greatly. So it can release the "bridge bump"phenomenon more effectively.