摘要
以重庆轨道交通4号线一期工程民安大道站—重庆北站(北广场)区间隧道下穿渝怀铁路隧道施工为背景,采用数值模拟的方法对岩质地层隧道常见的全断面法和台阶法2种施工方法近距离下穿既有隧道的影响进行有限元数值模拟分析,以研究不同施工方法对既有隧道应力、位移的影响。计算结果表明:2种隧道开挖方式在未穿越上部既有铁路隧道时,对围岩的影响无明显区别,而在穿越既有隧道及开挖完成后,对既有隧道产生的不均匀沉降全断面法较大,但全断面法在施工速度上较台阶法开挖更快。
Taking the tunnel of Min'an Avenue Station to Chongqing North Station(North Square)of the first phase of Chongqing Rail Transit Line 4 as the background,the method of numerical simulation is used to analyze the influence of two methods of full-section method and step method in rock formation tunnels which underpass existing tunnels in short distance.Through this method,the effects of different construction methods on the stress and displacement of existing tunnels are studied.The calculation results show that the influences of these two tunnel excavation methods on the surrounding rock have no obvious difference when they do not cross the existing railway tunnel;but the uneven settlement of the existing tunnel is larger for full-section method after undercrossing the existing tunnel,but the full-section excavation is faster than the step method.
作者
邵刚
罗维
SHAO Gang;LUO Wei(The 2nd Engineering Co., Ltd. of China Railway 12th Bureau Group, Taiyuan, China 030024;College of Civil Engineering, Chongqing University, Chongqing, China 400045)
出处
《公路交通技术》
2019年第1期91-96,共6页
Technology of Highway and Transport
基金
中铁十二局集团有限公司科技计划项目(CR122-CQDT-2017-006QT001)
关键词
地铁区间
开挖方式
既有隧道
下穿施工
沉降
subway section
excavation method
existing tunnel
undercrossing construction
settlement
