围垦填土对邻近新建桥梁的影响分析  

Analysis on Influence of Reclamation on Adjacent New Built Bridge

作　　者：高宏伟 邓会元[2,3] 程德林[4] GAO Hongwei;DENG Huiyuan;CHENG Delin(Xi’an rail transit Group Co.Ltd.,Xi’an 710016,China;Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education,Southeast University,Nanjing 210096,China;School of Civil Engineering,Southeast University,Nanjing 210096,China;CCCC Highway Planning&Design Institute Co.Ltd.,Beijing 100088,China)

机构地区：[1]西安市轨道交通集团有限公司,西安710016 [2]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [3]东南大学土木工程学院,南京210096 [4]中交公路规划设计院有限公司,北京100088

出　　处：《铁道建筑》2021年第1期39-43,共5页Railway Engineering

基　　金：江苏省普通高校研究生科研创新计划(KYLX16_0239);江苏高校优势学科建设工程资助项目(CE02-1)。

摘　　要：为了研究滨海滩涂围垦对邻近桥梁的影响,以宁波滨海新建杭甬(杭州—宁波)高速公路复线宁波段高架桥紧邻围垦工程为例,建立模型研究不同的桥梁与海堤距离情况下新建桥梁施工、海堤施工、围垦填土等的工序对邻近桥梁桩基的影响。计算结果表明:海堤施工、桩顶荷载施工及围垦填土对桩基水平位移的影响随着海堤距离增加呈指数函数衰减,拟建海堤距离桥梁180~220 m时,相同施工工序下,海堤距离桥梁每增加20 m,桩基最大水平位移可减少20.4%~23.7%;不同施工工序下,围垦填土的影响大于海堤施工;在围垦填土后施工桩顶荷载会出现重力二阶效应(P-Δ效应),导致桩身变形进一步增加,而在海堤施工和围垦填土之间施加桩顶荷载,有助于降低邻近桥梁桩基所受到的影响。In order to study the influence of reclamation on adjacent bridge,taking the newly-built Hangzhou-Ningbo Highway Viaduct of Ningbo Coastal Area adjacent reclamation project as an example,a numerical analysis model was established to study the influence on the bridge pile foundation because of the construction of new bridge,embankment,and reclamation with different embankment distances.The calculation results show that the effect of embankment construction,pile top load,and reclamation filling decreases exponentially as embankment distance increases.When the proposed embankment is 180~220 m away from the bridge,the maximum lateral deformation of the pile can be reduced by 20.4%~23.7%for each additional 20 m,given the same construction process.The construction influence of reclamation filling under different construction processes is greater than the effect of embankment construction.The P-Δeffect will induced by superstructure construction after reclamation construction,and the pile deformation will further increase.The pile top load construction between embankment construction and reclamation construction will be helpful to reduce the influence on the adjacent pile foundations.

关 键 词：桥梁桩基础 围垦填土 水平位移 数值模拟 P-Δ效应 

分 类 号：TU473[建筑科学—结构工程]