THE POINTS OF CONSTRUCTION OF NEW TUNNELS SPANNING EXISTING OPERATING TUNNELS
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.
new tunnelupper crossingexisting tunnelconstruction points
万方数据
维普
