基于长短桩的桥头地基布桩方案优化设计
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关键词：长短桩复合地基；桥头沉降；软基加固；布桩优化；PLAXIS有限元中图分类号：TU478 文献标志码：A 文章编号：1005-8249（2026）02-0099-09DOI：10.19860/j.cnki.issn1005-8249.2026.02.016
Optimization Design of Pile Layout Scheme for Bridge Approach Foundation Based on Long- Short Piles
KONG Qinglin'，YAN Ting²，LI Xinyang²，WANG Jinchang³，ZHANG Yongben²
（ ZCCC International Engineering Co.，Ltd.，Hangzhou 311399，China；2. School of Transportation
and Geomatics Engineering ShenYang Jianzhu University，Shenyang 11O168，China； 3. Institute of Transportation Engineering， Zhejiang University，Hangzhou 31OO27，China）
Abstract：Toefectivelyenhancetheload-bearingcapacityof thebridgehead foundationandreducesetlement，ensuringthe bridgeheadcansustaintheentirelifecyclefromconstructiontooperationunderroadloadwhilealsoconsidering cost一 efectiveness.This paper，basedon thereconstructionprojectof the Liuxia Interchangeon the Hangzhou Ring Expressway， designsacompositefoundationwithlongandshortpilesreinforced byconnecting beamsbetween pilecapstostrengthenthe bridgeheadfoundation．Using PLAXIS，across－sectionalmodelofthebridgeheadsectionisestablished.Combining engineeringrequirementswiththeantcolonyoptimizationalgorithm，acorespondingmathematicaltheoreticalmodelis constructedfortheoptimization schemedesign，ultimatelydetermining theoptimal pilearrngementscheme.Theresearch resultsidicatethat，byanalyzingthesetlementconditionsandthebendingmomentofsidepilesunderdierentpile arrangements，astaggeredarangementoflongandshortpileswas finallyselected.Aditionally，taking intoaccountthe performanceof eachschemeintermsof setlement，lateraldisplacement，andpile-soil stressratioduringandafter construction，acomprehensiveoptimization design was conductedconsidering load-bearing capacity，setlement，and constructioncosts，ultimatelydetermining two suitablepilearrangement schemes.Research findingscan providereferences for related applications.
Key words：composite foundationoflongand shortpiles；bridge approachsetlement；soft ground improvement；pilelayout optimization； PLAXIS finite element analysis
0 引言
桥头跳车是路桥过渡段的常见病害，是由于路桥连接处桥台与道路存在差异沉降，使车辆在通过时产生颠簸甚至跳跃，轻则影响乘坐舒适性，重则引发交通事故[1-2]。（剩余9503字）