Multiple Disturbances of Existing Tunnels Caused by Deep Excavation and New Shield Tunnel

Table 4

Change proportion of the typical section of the downline.

Typical section segment ring of the downline	Content of monitoring	Disturbance caused by excavation of foundation pit/mm	Disturbance caused by new tunnel tunneling/mm	Proportion of change
X510	Vertical displacement	−0.6	0.6	−200.0%
	Horizontal displacement	0.9	−0.2	−122.2%
	Segment convergence	0.9	0.0	−100.0%
	Differential settlement of ballast bed	0.0	0.2	/
X518	Vertical displacement	−0.9	−0.9	0
	Horizontal displacement	0.9	−0.8	−188.9%
	Segment convergence	1.1	0.7	−36.4%
	Differential settlement of ballast bed	−0.3	−0.2	−33.3%
X523	Vertical displacement	−0.8	0.2	−125.0%
	Horizontal displacement	1.0	−1.2	−220.0%
	Segment convergence	1.0	0.1	−90.0%
	Differential settlement of ballast bed	−0.5	−0.7	40.0%