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

Table 2

Surface subsidence during excavation of each part of Section 1.

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
−25.6	0	−0.32	−0.32	0.0	100.0
−20.6	−0.46	−1.53	−1.99	23.1	76.9
−15.6	−1.25	−2.68	−3.93	31.8	68.2
−10.6	−2.47	−5.47	−7.94	31.1	68.9
−5.6	−6.12	−8.89	−15.01	40.8	59.2
−3.6	−8.51	−11.33	−19.84	42.9	57.1
−1.6	−11.05	−10.21	−21.26	52.0	48.0
1.6	−11.28	−10.92	−22.20	50.8	49.2
3.6	−9.69	−11.87	−21.56	44.9	55.1
5.6	−6.98	−9.35	−16.33	42.7	57.3
10.6	−3.26	−6.02	−9.28	35.1	64.9
15.6	−1.63	−3.34	−4.97	32.8	67.2
20.6	−0.37	−1.86	−2.23	16.6	83.4
25.6	0	−0.49	−0.49	0.0	100.0