盾构近接高架桥桩施工对桩基位移的影响研究  

Research on the Influence of Shield Adjacent Viaduct Pile Construction on Pile Foundation Displacement

作　　者：王玉林 丁邦威 WANG Yulin;DING Bangwei(China Railway(Shanghai)Investment Group Co.,Ltd.,Shanghai 201101,China;College of Transportation Engineering of Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]中铁(上海)投资集团有限公司,上海201101 [2]南京工业大学交通运输工程学院,南京211816

出　　处：《路基工程》2025年第1期178-183,共6页Subgrade Engineering

基　　金：江苏省研究生科研与实践创新计划项目(SJCX23_0496)。

摘　　要：依托南京地铁S2号线西善桥—板桥北站区间盾构近接斜交宁马高速高架桥工程,采用数值模拟方法分析盾构穿越前后桥桩位移变化,研究掘进过程中不同桩隧间距条件下桥桩位移变化规律。结果表明:盾构近接斜交高架桥施工会引起桥桩沉降,桩隧间距为0.5D时,盾构穿越后桥桩最大沉降3.47 mm,占总沉降量的61%,且桩隧间距越大占比越高;盾构穿越前后桥桩受到纵向土压力方向不同,引起的桥桩纵向位移较小,最大纵向位移1.13 mm,盾构开挖面的挤土作用和盾尾注浆压力产生的土压力使桥桩发生较大的横向变形,最大横向位移5.63 mm。Based on the Nanjing Metro S2 Line Xishanqiao Station-Banqiao North Station section shield tunneling adjacent oblique crossing Ningma Expressway viaduct project,a numerical simulation method was conducted to analyze the displacement changes of bridge piles before and after crossing.The displacement changes of bridge piles under different pile tunnel spacing conditions during shield tunneling were studied.The research has shown that shield tunneling adjacent oblique crossing viaduct construction causes settlement of bridge piles.When the distance between piles and tunnels is 0.5D,the maximum settlement of bridge piles after shield tunneling is 3.47 mm,accounting for 61%of the total settlement,and the larger the distance between piles and tunnels,the higher the proportion.The direction of longitudinal soil pressure on the bridge piles before and after shield tunneling is different,resulting in a small longitudinal displacement of the bridge piles,with a maximum longitudinal displacement of 1.13 mm.The soil pressure generated by the squeezing effect of the shield excavation surface and the grouting pressure at the tail of the shield causes significant lateral deformation of the bridge piles,with a maximum lateral displacement of 5.63 mm.

关 键 词：砂质泥岩 盾构穿越 高架桥桩 近接斜交 沉降观测 变形控制 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]