铁道标准设计2016，Vol.60Issue(12)：89-93,5.DOI:10.13238/j.issn.1004-2954.2016.12.020
地铁区间隧道下穿既有桥梁的桩基托换研究
Research on Pile Foundation Underpinning of Subway Running Tunnel Passing under Existing Bridge
摘要
Abstract
Based on the pile foundation project where Shenzhen Metro Line 7 Huangmugang station tunnel passes under Huaqiang overpass, a finite element model is established to study the load transformation rule and pile foundation settlement laws of passive and active underpinning of pile and beam underpinned pile. The results show that the passive underpinning settlement is mainly caused by the bending deformation of underpinning beam, but the jacking effects of the jack can effectively offset bending deformation of the underpinning beam at the time of active underpinning; the top displacement of 1. 68 mm is the best position to cut the pile at the time of active underpinning, and it is the best time to effectively reduce the influence of underpinning process on the upper structure of the bridge;there is great uplift on the bridge pier column surface before and after the overall construction of passive underpinning, which fails to satisfy the requirement for smooth bridge deck. The research results are directly used to guide the Huangmugang station tunnel construction, and may provide reference for future similar projects.关键词
地铁隧道/桩基托换/荷载转换/沉降/数值模拟Key words
Metro tunnel/Pile foundation underpinning/Load transformation/Settlement/Numerical simulation分类
交通工程引用本文复制引用
黄希,陈行,晏启祥..地铁区间隧道下穿既有桥梁的桩基托换研究[J].铁道标准设计,2016,60(12):89-93,5.基金项目
国家科技支撑计划课题(2013BAB10B04) （2013BAB10B04）
国家自然科学基金资助项目(51178400,51278425) （51178400,51278425）
中国铁路总公司科技计划重点课题(2014G004-H) （2014G004-H）
