管廊基坑工程对邻近高架结构的影响分析  

Analysis of Influence of Pipe Gallery Foundation Pit on Adjacent Elevated Structures

作　　者：吴虎健 WU Hujian(China Railway 18th Bureau Group No.5 Engineering Co.,Ltd.,Tianjin 300450,China)

机构地区：[1]中铁十八局集团第五工程有限公司,天津300450

出　　处：《国防交通工程与技术》2023年第3期58-62,共5页Traffic Engineering and Technology for National Defence

摘　　要：依托某新建管廊工程,建立Midas/GTS三维有限元模型开展管廊基坑施工对城市交通高架结构的全过程影响研究,分析了管廊基坑施工对高架结构周边土体、承台、桥面、下部桩基的影响。计算表明:①高架桥竖向变形表现为桥面和桥墩沉降,竖向沉降量最大值为0.8 mm;②邻近高架桥桩基础水平向变形表现为桩基础向基坑方向偏移,最大水平位移约0.1 mm;③管廊基坑施工对正投影范围内高架桥桩基础变形影响大于其他区域,距离基坑越远,影响越小。施工监测与数值模拟结果保持一致。Based on a newly built pipe gallery project,a Midas/GTS three-dimensional finite element model was established to conduct a study on the overall process impact of pipe gallery foundation pit construction on the urban traffic elevated structures.The impact of pipe gallery foundation pit construction on the surrounding soil,cushion caps,bridge decks,and lower pile foundations of the elevated structures was analyzed.The calculation results show that:(1)The vertical deformation of the viaduct is the settlement of the bridge deck and pier,with a maximum vertical settlement of 0.8 mm;(2)The horizontal deformation of the pile foundation adjacent to the viaduct is represented by the displacement of the pile foundation towards the foundation pit,with the maximum horizontal displacement of about 0.1 mm.(3)The deformation of the pile foundation of the viaduct within the orthographic projection range caused by the construction of the pipe gallery foundation pit is greater than that of the pile foundation in other areas.The farther away from the foundation pit,the smaller the impact.The results of construction monitoring is consistent with the numerical simulation.

关 键 词：高架结构 管廊 基坑 桩基础 承台 MIDAS 变形 

分 类 号：TU990.3[建筑科学—市政工程]