邻近堆载作用下桥梁桩基内力与变形数值分析

打开文本图片集

MA Di

（State Owned Assets Management Department， Shaanxi Normal University，Xi'an 71O119，China） Abstract：Inthispaper，theinfluenceofpileloadontheinternalforceanddeformationofadjacent bridgepilefoundationis studied by numericalanalysis.TheCELmethodwasusedtoestablishathree-dimensionalfiniteelement modelof the pile foundationofabridge.Thevalidityofthemodelisverifiedbycomparing the measuredandcalculatedtransversedisplacementof thetracktopsurface.Basedonthecalculationresultsof themodel，theinternal forceanddeformationcharacteristicsof pile foundation near a large number of piles are analyzed：Each pile's maximum horizontal displacement appears at 1/2L of the pile body.In the range of 1/6L～2/3L of each pile，a large additional bending moment was generated. The upper part of the pile closer tothesurchargehasanegativefrictionalforce，which in turnproducesanadditionalaxial forceof581＼～1368kN.Itis obvious that thesurcharging loadseriouslydeteriorates thepilefoundation.Itcanprovideafeasible methodforactive prevention and control of pier deflections caused by surcharge load.

Keywords：surcharge loading；bridge pile foundation；CEL；numerical analysis； internal force；deformation

0 引言

实际工程中的桥梁桩基，不仅承受上部结构传来的主动荷载，还承受其他原因导致的被动荷载。（剩余7220字）