PDF全文阅读

陈俊驰¹  ,  刘    波¹  ,  周博闻^{2 , 3} ,  汤立峰^{2 , 3}

( 1 .  中电建重庆勘测设计研究院有限公司 ，重庆 401329 ;  2.  湖南省交通规划勘察设计院有限公司，

长沙 410000 ;  3 .  湖南省轨道勘察设计有限公司 ，长沙 410000)

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。

关键词：基坑 ；区间隧道 ；MJS 工法 ；数值分析 ；变形 ；加固方案

中图分类号：U231            

文献标志码：A           

文章编号： 1005- 8249   (2025)  02- 0060- 08 

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .02.011

 

CHEN Junchi ¹  ,  LIU Bo¹ ,  ZHOU Bowen^2 , 3 , TANG Lifeng^2 , 3

(1 . China Power Construction Chongqing Survey ,  Design and Research Institute Co . ,  Ltd. ,  Chongqing 401329 ,

China;  2. Hunan  Provincial Communications Planning ,  Survey & Design Institute Co . ,  Ltd . ,

Changsha 410000 ,  China;  3 . Hunan  Rail  Survey and Design Co . ,  Ltd . ,  Changsha 410000 ,  China)    

Abstract：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 rationality of the finite element model was verified by comparing it with the measured deformation results of the tunnel. The results indicate that the use of MJS foundation reinforcement method in silty strata can effectively control the vertical uplift and horizontal deformation of tunnels, and reduce the relative deformation of tunnel sections; The vertical uplift deformation of the tunnel decreases with the increase of the base reinforcement area, and the decrease in uplift deformation increases with the increase of the base reinforcement area. To control the deformation of the tunnel structure, full bottom sealing reinforcement measures should be taken; As the depth of foundation reinforcement increases, the vertical 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 on both sides of the tunnel and the reinforcement of the foundation has significant advantages in controlling the deformation of the tunnel structure. The horizontal deformation and vertical 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.

Key words: pit; running tunnel; MJS construction method; numerical analysis; deformation; reinforcement plan

基金项目： 湖南高新技术产业科技创新引领计划(2022GK4033) 。

作者简介： 陈俊驰  (1990—) ,  男 ，本科 ，高级工程师 ，研究方向：轨道交通地下结构。

通信作者：周博闻  (1990—) ,  男 ，硕士 ，高级工程师 ，研究方向：城市轨道交通工程技术。

收稿日期：2024 - 10 - 21