Analysis and Prediction of Subway Tunnel Surface Subsidence Based on Internet of Things Monitoring and BP Neural Network

Table 3

Surface subsidence during excavation of each part of Section 2.

Distance from midline	Middle hole excavation settlement	Excavation settlement of left and right side holes	Total settlement	Middle cave settlement/total settlement	Side tunnel settlement/total settlement
−25.7	0	−0.58	−0.58	0.0	100.0
−20.7	−0.55	−1.83	−2.38	23.1	76.9
−15.7	−1.69	−2.98	−4.67	36.2	63.8
−10.7	−2.77	−6.52	−9.29	29.8	70.2
−5.7	−6.34	−10.09	−16.43	38.6	61.4
−3.7	−9.12	−11.55	−20.67	44.1	55.9
−1.7	−11.66	−11.12	−22.78	51.2	48.8
1.7	−12.39	−11.46	−23.85	51.9	48.1
3.7	−9.91	−11.87	−21.78	45.5	54.5
5.7	−6.78	−10.64	−17.42	38.9	61.1
10.7	−3.32	−7.18	−10.5	31.6	68.4
15.7	−1.54	−3.51	−5.05	30.5	69.5
20.7	−0.73	−1.99	−2.72	26.8	73.2
25.7	0	−0.63	−0.63	0	100.0