An Investigation into the Tunnel-Soil-Pipeline Interaction by In Situ Measured Settlements of the Pipelines

Table 3

Measured final settlements of the pipelines and the ground surface.

Items	Pipeline		Ground surface over pipeline
	No. of monitoring point	Settlement (mm)	Final settlement (mm)	Settlement before measuring pipeline settlement (mm)	Concurrent surface settlement (mm)
ϕ 1400 steel water pipeline	WS14-1	−13.8	−53.5	−31.1	−22.4
	WS14-2	−34.2	−65.0	−29.5	−35.5
	WS14-3	−33.6	−65.5	−10.2	−55.3
	WS14-4	−31.4	−59.0	−5.9	−53.1
	WS14-5	−39.1	−58.2	−3.4	−54.8
ϕ 300 cast iron water pipeline	WI3-1	−37.6	−71.3	−31.7	−39.6
	WI3-2	−42.5	−74.5	−22.4	−52.1
	WI3-3	−44.6	−56.8	−6.0	−50.8
ϕ 800 steel water pipeline	WS8-3	−35.1	−59.8	−3.6	−56.2
ϕ 400 steel gas pipeline	GS4-1	−32.7	−59.4	−29.0	−30.4
	GS4-2	−46.0	−74.5	−22.4	−52.1
	GS4-3	−32.9	−61.1	−9.6	−51.5
ϕ 500 steel gas pipeline	GS5-1	−44.6	−73.9	−28.9	−45
ϕ 800 cast iron water pipeline	WI8-4	−30.6	—	—	—
	WI8-3	−47.5	—	—	—