With the rapid development of metro construction in major cities,there are more and more overlapping tunnels.The previous studies were mostly carried out from theoretical analysis,numerical simulation and laboratory experiments.For the Miao-Xia project of the east extension of Guangzhou metro line 5,the new shield tunnel spans the existing line 13,with a minimum vertical spacing of 1.27m.Aiming at this working condition,the construction control points are put forward from four aspects:control of excavation quantity,excavation parameters,grouting parameters and attitude of shield.The third-party automated monitoring data confirmed that the construction measures were effective.
关键词
新建隧道/上跨/既有隧道/施工要点
Key words
new tunnel/upper crossing/existing tunnel/construction points
维普
万方数据