复合地层盾构交叠下穿施工下既有隧道变形分析
Deformation analysis of shield undercrossing and vertical paralleling excavation with existing tunnel in composite stratum
周中 1郑熠迪 2胡江锋 2杨豪 3龚琛杰2
作者信息
- 1. School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Research Center of Highway Maintenance Technology,Changsha University of Science&Technology,Changsha 410114,China
- 2. School of Civil Engineering,Central South University,Changsha 410075,China
- 3. School of Civil Engineering,Central South University,Changsha 410075,China;School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China
- 折叠
摘要
复合地层中盾构隧道交叠下穿既有隧道时,既有隧道的变形较为复杂.因此,本文考虑了浆体固结和盾构交叠下穿施工,提出一种既有隧道变形计算方法.首先,利用等效层理论简化复合地层,分析不同因素引起的地层变形,并引入浆液固结方程对其进行修正;然后,基于分段计算思想,建立盾构交叠下穿既有隧道的计算公式;最后,通过有限元模型分析实际工程中既有隧道的变形,验证所提理论的有效性.结果表明:数值模拟结果与本文理论计算结果关于变形趋势是一致的,盾构与既有隧道交叠前,既有隧道变形总体呈"M"型;交叠后,既有隧道变形逐渐变为"U"形,最大变形点由交叠点向盾构掘进方向移动,既有线沉降变形区间逐渐扩大,最大变形增量逐渐减小并趋于稳定.
Abstract
A deformation of an existing tunnel is complicated when a shield tunnel undercrossing and vertical paralleling excavates with existing tunnel in composite stratum.Therefore,a novel deformation calculation method is proposed for the existing tunnel considering slurry consolidation and shield undercrossing and vertical paralleling excavation.First,the equivalent layer method is used to simplify the composite stratum,the deformation caused by different factors is analyzed,and the slurry consolidation equation is introduced to correct it.Then,according to the subsection calculation idea,the calculation formula of shield undercrossing and vertical paralleling with the existing tunnel is established.Finally,considering an actual engineering case,a finite element model is established to analyze the deformation of the existing tunnel.Results show that before the shield construction section overlaps with the existing tunnel,the deformation curve of the existing tunnel generally exhibits an"M"form;After the overlap,the deformation curve of the existing tunnel gradually becomes"U"shape,and the maximum deformation point moves from the overlapping point to the shield tunneling direction;The settlement deformation range of the existing line gradually expands,and the maximum deformation increment gradually decreases and tends to stabilize.
关键词
盾构隧道/既有隧道/交叠下穿Key words
shield tunnel/existing tunnel/undercrossing and vertical paralleling引用本文复制引用
基金项目
Central South University Innovation-Driven Research Programme,China(2023CXQD067)
Young Elite Scientists Sponsorship Program by CAST,China(2022QNRC001)
Hunan Provincial Science and Technology Promotion Talent Project,China(2023TJ-N24)
出版年
2023
NETL
NSTL
维普
万方数据