盾构区间地表沉降监测与结果分析

以XX城市轨道交通为例,监测其盾构区间上方的地表沉降。从地表沉降监测数据来看,盾构区间在盾构机通过时左右线中线上方地表沉降监测点变化较大,为此,在盾构机通过时加大盾构上方监测点的监测频率,并通过调整盾构机的掘进参数和盾构注浆量来减小沉降量。地表沉降曲线表明:在盾构掘进的过程中监测点出现先升后降再稳定的现象。

The Monitoring and Result Analysis of Shield Interval Surface Subsidence

Taking XX city rail transit as an example to monitor the surface subsidence at the top of shield interval. From the monitoring data of surface subsidence, the change of the monitoring point in shield interval is bigger when shield machine through the Central Line above the surface subsidence. Therefore, enlarging the monitoring frequency above the shield when the shield machine working, and then adjusting the excavation parameters of shield machine and shield grouting quantity to reduce settlement is very important. Ground surface settlement curve shows that the monitoring point increases at first, and then reduces, stabilizes at last in the process of shield tunneling monitoring stations.