摘要
以高铁清河火车站配套人行通道和公交通道并行基坑侧穿G7高速清河桥为例,研究并行基坑开挖对邻近桥梁的影响及保护措施。首先,考虑并行基坑开挖的空间效应,建立有限元数值模型,分析基坑开挖对邻近桥梁桩基础的叠加影响。计算结果表明:由于并行基坑开挖对桥梁桩基础扰动的叠加效应,导致桥梁墩柱的绝对沉降、差异沉降和倾斜等指标均超过控制值;结合数值模拟结果和类似工程经验,提出对邻近桥梁采用钻孔灌注桩作为隔离桩的保护措施,根据并行基坑施工对邻近桥梁不同部位的影响差异,给出隔离桩的平面布置。邻近桥梁墩柱变形实测表明隔离桩能有效约束基坑开挖的叠加效应,保证G7高速清河桥的安全运行。
Taking the parallel foundation pit of pedestrian passage and bus passage attached to Qinghe railway station of high-speed railway passing through G7 high-speed Qinghe bridge as an example,the influence of parallel foundation pit excavation on adjacent bridges and the protection measures were studied.Firstly,considering the spatial effect of parallel foundation pit excavation,a finite element numerical model was established to analyze the superimposition effect of foundation pit excavation on adjacent bridge pile foundation.The calculation results show that the absolute settlement,differential settlement and inclination of the bridge piers all exceed the control values due to the superposition effect of the bridge pile disturbance caused by the excavation of the foundation pit.Combined with numerical simulation results and the similar engineering construction experience,a protective measure of using bored piles as isolation piles for adjacent bridges is proposed,and the layout of isolation piles is given according to the difference of influence of parallel foundation pit construction on different parts of adjacent bridges.The measured deformation results of adjacent bridge piers show that the isolation piles effectively constrain the superposition effect of foundation pit excavation and ensure the safe operation of G7 high-speed Qinghe bridge.
作者
张仲宇
李兆平
杨航
龙奇峰
冯超
ZHANG Zhongyu;LI Zhaoping;YANG Hang;LONG Qifeng;FENG Chao(Beijing No.4 Municipal Construction Engineering Co.,Ltd.,Beijing 100176,China;School of Civil&Architecture Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2023年第3期68-74,共7页
China Safety Science Journal
基金
北京市政建设集团有限责任公司科技研究开发计划项目(2019-03)。
关键词
并行基坑
邻近桥梁
保护措施
隔离桩
数值模拟
parallel foundation pit
adjacent bridge
protective measures
isolation pile
numerical simulation
