摘要
为确定深基坑上跨盾构隧道施工时隧道的隆起及水平变形规律,以某深基坑上跨区间隧道工程为研究对象,采用有限元分析方法,研究了不同基底加固面积、加固深度、加固方式时隧道的变形规律,并与隧道实测变形结果对比验证了有限元模型的合理性。结果表明:淤泥质地层中采用MJS基底加固方法可有效控制隧道的隆起及水平变形,减小隧道截面的相对变形;隧道隆起变形随基底加固面积增加而减小,应采取全封底加固措施控制隧道结构变形;随基底加固深度增加隧道隆起变形减小,基底加固深度超过一定限值后,增加加固深度对减小隆起变形效果减弱;隧道两侧地层加固与基底加固形成的门式加固体系控制隧道结构变形优势显著,隧道水平变形、隆起变形随两侧加固宽度增加而减小,两侧最佳加固宽度为2 m。研究成果可为类似工程提供参考。
In order to determine the vertical uplift and horizontal deformation laws of a shield tunnel construction on a deep foundation pit,a cross section tunnel project on a deep foundation pit was taken as the research object.The finite element analysis method was used to study the deformation laws of the tunnel under different base reinforcement areas,reinforcement depths,and reinforcement methods.The results show that the use of MJS base reinforcement method in silty strata can effectively control the uplift and horizontal deformation of tunnels,and reduce the relative deformation of tunnel sections;The uplift deformation of the tunnel decreases with the increase of the base reinforcement area,and full bottom reinforcement measures should be taken to control the deformation of the tunnel structure;As the depth of foundation reinforcement increases,the uplift deformation of the tunnel decreases.After the depth of foundation reinforcement exceeds a certain limit,increasing the reinforcement depth weakens the effect of reducing uplift deformation;The portal reinforcement system formed by the reinforcement of the strata and foundation on both sides of the tunnel has significant advantages in controlling the deformation of the tunnel structure.The horizontal deformation and uplift deformation of the tunnel decrease with the increase of the reinforcement width on both sides,and the optimal reinforcement width on both sides is 2m.The research results can be used as a reference for similar projects.
作者
陈俊驰
刘波
周博闻
汤立峰
CHEN Junchi;LIU Bo;ZHOU Bowen;TANG Lifeng(China Power Construction Chongqing Survey,Design and Research Institute Co.,Ltd.,Chongqing 401329,China;Hunan Provincial Communications Planning,Survey&Design Institute Co.,Ltd.,Changsha 410000,China;Hunan Rail Survey and Design Co.,Ltd.,Changsha 410000,China)
出处
《粉煤灰综合利用》
2025年第2期60-66,168,共8页
Fly Ash Comprehensive Utilization
基金
湖南高新技术产业科技创新引领计划(2022GK4033)。
关键词
基坑
区间隧道
MJS工法
数值分析
变形
加固方案
pit
running tunnel
MJS construction method
numerical analysis
deformation
reinforcement plan
