摘要
高速铁路对线路基础沉降要求极为严格,为确保高铁安全运营和结构安全,邻近高铁线桩基采用全套管灌注桩施工方法以减小对既有线的扰动影响。以宁和城际一期工程的板桥河段桩基工程为背景,基于PLAXIS 3D对钢套管施工过程进行模拟,并结合现场监测数据对邻近既有高铁线全套管灌注桩施工的微扰动进行分析。结果表明:土体侧向变形的模拟结果与实测结果总体吻合,但存在局部差异,采用套管逐节旋压并利用抓斗将管内部分土体取出的施工方法,对高铁桥墩周围土体的侧向变形影响较小;高铁桥墩处于钢套管施工影响范围内,其竖向和水平位移在钢套管施工期间存在一定变化,但均远小于预警值。
The limit condition of foundation settlement of high-speed railway line is strict.To ensure the operational safety of high-speed railway and safety of structures near high-speed railway bridge,Beneto pile was conducted to mitigate the effect caused by pile construction.The pile foundation of Banqiao River of the first-stage project of Ninghe intercity railway in Nanjing city was taken as the research object.This paper analyses micro-disturbed construction of Benoto pile near high-speed railway bridge by numerical simulation based on PLAXIS 3Dand field measurement.The protective jacket tube was rotated and pressed by segment-to-segment approach and partial soil in the tube was removed in time.Results show that the effect caused by this method is slight.With the increase of soil depth,the height of soil in the protective jacket tube should be increased either to avoid piping effect.The high-speed railway bridge pier within the scope of influence of Benoto pile construction.The vertical and horizontal displacements of pier much less than early warning value and fluctuate during the construction of the protective jacket tube.Results can provide reference for the design and construction of pile near high-speed railway bridge.
作者
王飞球
张一鸣
王浩
荀智翔
朱克宏
WANG Feiqiu;ZHANG Yiming;WANG Hao;XUN Zhixiang;ZHU Kehong(School of Civil Engineering,Central South University,Changsha 410075,China;Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 210096,China;China Railway 24th Bureau Group Co.,Ltd.,Shanghai 200071,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2019年第5期809-816,共8页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家973计划青年科学家专题项目（2015CB060000）
中国铁路总公司科技研究开发计划重点课题（2017G002-K）资助
关键词
全套管灌注桩
高铁桥梁
数值模拟
现场实测
微扰动
Benoto pile
high-speed railway bridge
numerical simulation
field measurement
micro-disturbed
