摘要
以北京地铁一盾构近接工程为背景,结合理论分析、数值模拟计算和现场实测数据反馈等多种研究手段,研究新建盾构隧道施工过程中对已建盾构隧道纵向和横向变位、附加弯矩及轴力的影响分布变化规律,发现近邻隧道盾构施工对已建隧道的影响存在一种纵向效应,表现为应力的"提前到达"和变形的"滞后发展",对于国内近接施工中首次采用的钢支撑预加固措施进行验证,研究表明钢支撑特别是横向钢支撑的预加固对于改善已建隧道受力状态效果十分明显,为双孔并行盾构近接施工提供了很好的借鉴作用。
The case study presented is based on a new shield tunnel approaching, which is close to an existing subway tunnel in Beijing. With theoretical analysis, numerical modeling and the feedback of field monitoring, the influences on the existing shield tunnel in terms of longitudinal and transverse displacements, bending moment, and axial force brought by the newly parallel approaching one are investigated. And it reveals that there is the longitudinal effect on the existing tunnel when the extremely close shield moves forward, which is presented as the phenomenon of ＂early stress arrival and deformation lagging＂. The study results verify that the effectiveness of the cross steel support is remarkable and especially the transverse steel support makes a great contribution to the improvement the existing tunnel stress state, which may provide informative experience for relevant cases.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2009年第9期1856-1862,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展计划(973)项目(2007CB714203)
北京市自然科学基金及北京市教育委员会科技计划重点项目(KZ200910005009)
国家"十一五"科技支撑计划(2006BAJ27B05)
关键词
隧道工程
盾构
超近距离施工
并行隧道
数值模拟
tunnelling engineering
shield tunnel
extremely close approaching construction
parallel tunnel
numerical simulation
