新建隧道上跨施工引起既有盾构隧道纵向变形力学模型研究
Study on Mechanical Model for Longitudinal Deformation of Existing Shield Tunnel Caused by New Tunnel Over-crossing Construction
刘博 1郑金雷 2张昭 3麻建飞4
作者信息
- 1. 河南省轨道交通研究院有限公司,郑州 450000;河南开封城际铁路投资有限公司,开封 475000
- 2. 河南省轨道交通研究院有限公司,郑州 450000;河南铁建投新基建有限公司,郑州 450000;北京交通大学土木建筑工程学院,北京 100044
- 3. 河南省轨道交通研究院有限公司,郑州 450000
- 4. 北京交通大学土木建筑工程学院,北京 100044
- 折叠
摘要
基于压力拱理论,根据新建隧道与压力拱的相对位置,将新建隧道上跨既有盾构隧道施工分为3种模式,并建立相对应的力学计算模型,给出模型适用的变形控制方程和求解方法,然后结合北京市大兴机场线新建草桥站上跨既有10号盾构隧道工程实测数据进行模型验证.结果表明,所提出的模型准确性高,计算得到的盾构隧道最大竖向位移相较于传统模型计算结果更接近实测值,可以提高盾构隧道纵向变形预测精度.
Abstract
Based on the pressure arch theory,the construction of a new tunnel crossing over an existing shield tunnel is divided into three modes according to the relative position of the new tunnel and the pressure arch.Corresponding mechanical calculation models are established,and the applicable deformation control equations and solution methods for the models are provided.The models are then validated using measured data from the new Caoqiao Station of the Beijing Daxing Airport Line,which crosses over the existing shield tunnel of Line 10.The results show that the pro-posed models have high accuracy,with the calculated maximum vertical displacement of the shield tunnel being closer to the measured values compared to traditional models,thereby improving the accuracy of longitudinal defor-mation prediction for shield tunnels.
关键词
上跨施工/盾构隧道/地基梁/纵向变形/隆起Key words
Over-crossing construction/Shield tunnel/Foundation beam/Longitudinal deformation/Uplift引用本文复制引用
基金项目
北京交通大学科技创新计划(KCL17001530)
出版年
2024
NETL
NSTL
万方数据