富水砂层深基坑盖挖逆作施工对周边环境影响  

Impact of Deep Foundation Pit Covered-excavation Reverse Construction in Water-rich Sand Layers on Surrounding Environment

作　　者：黄志强 柳策 张宁 王国林 于富来 HUANG Zhiqiang;LIU Ce;ZHANG Ning;WANG Guolin;YU Fulai(School of Architecture and Civil Engineering,Shenyang University of Technology,110870,Shenyang,China;Municipal Environmental Production Engineering Co.,Ltd.,of CREC Shanghai Group,201906,Shanghai,China)

机构地区：[1]沈阳工业大学建筑与土木工程学院,沈阳110870 [2]中铁上海工程局集团市政环保工程有限公司,上海201906

出　　处：《城市轨道交通研究》2024年第12期188-195,共8页Urban Mass Transit

基　　金：国家自然科学基金项目(42007241)。

摘　　要：[目的]随着我国城市现代化的不断推进,城市内可利用的空间越来越少,而深基坑多建设于环境敏感区域,基坑施工对周边环境的影响不可避免,尤其是富水深厚砂层地区的深基坑施工,一旦施工控制不当极易出现严重危害,因此需研究富水砂层深基坑盖挖逆作法施工对周边环境的影响。[方法]以沈阳地铁4号线沈阳北站为例,通过施工监测方法,分析了深基坑施工过程对地上建筑物、地下构筑物、地下管线、电力管廊的变形影响。[结果及结论]开挖初期,地上建筑物以沉降变形为主,随着开挖深度的增加,沉降变形逐渐减小,最终均呈现为隆起变形。地下构筑物变形受基坑开挖面位置影响较大,当开挖面接近构筑物基础埋深时,构筑物变形达到最大。地下管线有明显的位置性影响,右侧管线变形远大于左侧管线变形,两侧均以沉降变形为主。电力管廊变形与基坑开挖深度密切相关,当开挖深度较浅时,电力管廊基本不受影响,而在车站地下四层开挖施工期间,电力管廊变形开始逐渐增大。[Objective]With the continuous advancement of urban modernization in China,the available space within cities is becoming increasingly scarce.Deep foundation pits are often constructed in environmentally sensitive areas,inevitably making impact on the surrounding environment.This is particularly true for deep foundation pits in areas with thick,water-rich sand layers,where improper construction control can easily lead to severe hazards.Therefore,it is necessary to study the impact of deep foundation pit covered-excavation reverse construction in water-rich sand layers on the surrounding environment.[Method]Using Shenyang North Railway Station on Shenyang Metro Line 4 as an example,the deformation impact of deep foundation pit construction on the above-ground buildings,underground structures,underground pipelines,and power corridors is analyzed through construction monitoring method.[Result&Conclusion]In the initial stages of excavation,the above-ground buildings primarily exhibit settlement deformation.As the excavation depth increases,settlement deformation gradually decreases,eventually presenting as upheaval deformation.The deformation of underground structures is significantly affected by the position of the excavation face,with maximum deformation occurring when the excavation face approaches the foundation buried depth of the structures.Underground pipelines show a clear positional impact,with the deformation of the right-side pipelines being much greater than that of the left-side pipelines,both primarily exhibiting settlement deformation.The deformation of power corridors is closely related to foundation pit excavation depth.When the excavation depth is relatively shallow,the power corridors are largely unaffected,but during the excavation of the fourth underground level of the station,the deformation of the power corridors begins to increase gradually.

关 键 词：地铁 盖挖逆作法施工 周边环境影响 

分 类 号：U231.3[交通运输工程—道路与铁道工程]