Numerical Study on the Disturbance Effect of Short-Distance Parallel Shield Tunnelling Undercrossing Existing Tunnels

Table 3

The comparative analysis results of the maximum settlement and error of the vault.

Monitoring point number	After excavation of right line of line 5 (numerical results)	After excavation of right line of line 5 (actual value)	Error value (%)	After excavation of left line of line 5 (numerical results)	After excavation of left line of line 5 (actual value)	Error value (%)
ZGD-1	−2.22	−2.35	5.53	−5.32	−5.61	5.17
ZGD-2	−2.17	−2.29	5.24	−5.24	−5.54	5.42
ZGD-3	−2.11	−2.22	4.95	−5.14	−5.43	5.34
ZGD-4	−2.10	−2.23	5.83	−5.12	−5.40	5.19
ZGD-5	−2.08	−2.16	3.70	−5.12	−5.36	4.48
ZGD-6	−2.03	−2.12	4.25	−5.07	−5.30	4.34
ZGD-7	−1.93	−2.04	5.39	−4.94	−5.21	5.18
ZGD-8	−1.90	−1.99	4.52	−4.9	−5.17	5.22
ZGD-9	−1.82	−1.95	6.67	−4.86	−5.14	5.45