摘要
由于连拱隧道跨度大、结构复杂,导致其受力状态十分复杂。本文以包茂高速公路白石岗隧道为工程依托,采用数值分析软件对偏压连拱隧道施工过程进行模拟,研究对比隧道三导洞法及中导洞法施工时的地表下沉、中隔墙应力及位移、围岩应力变化规律等;通过改进施工工法、优化开挖空间效应方案,并对数值模拟结果和现场监控量测数据进行对比分析,得出采用施工步长4 m的三导洞法施工且后主洞开挖掌子面滞后前主洞掌子面20 m间距为最优方案的结论,研究方法及结论对同类特征隧道设计施工具有借鉴指导意义。
Because of its long span and complex structure,the stress state of the multi-arch tunnel is very complicated.Based on Baishigang Tunnel of Baotou-Maoming Expressway,the construction process of unsymmetrical multi-arch tunnel is simulated by using numerical analysis software.The ground subsidence,stress and displacement of middle partition wall and surrounding rock stress variation law of tunnel construction by three pilot tunnel method and middle pilot tunnel method are compared and analyzed.By optimizing construction method and the excavation space effect scheme,and comparing the numerical simulation results with the field monitoring and measurement data,it is concluded that the optimal scheme is to adopt the three pilot tunnel method with the construction step of 4 m,and the excavation face of the rear main tunnel lags behind the 20 m spacing of the front main tunnel face.The research method and conclusion can be used for reference in the design and construction of similar tunnels.
作者
朱红桃
ZHU Hongtao(China Railway 20th Bureau Group Co.Ltd.,Xi'an Shaanxi 710016,China)
出处
《铁道建筑技术》
2020年第10期33-36,105,共5页
Railway Construction Technology
基金
中铁二十局集团有限公司科技研发计划项目(2015B12)。
关键词
连拱隧道
偏压
中隔墙
数值模拟
优化分析
multi-arch tunnel
bias
middle partition wall
numerical simulation
optimization analysis
