Analysis of Construction Settlement of Shield Tunnel Crossing Metro Operating Tunnel

Abstract

Based on the background of the Suzhou Metro Line 3 crossing the Line 1 operating tunnel, the finite element software MIDAS/GTS was used to perform 3D model and simulate the construction of the shield tunnel. The influence of shield tunnel penetration before and after strengthening on operating tunnels is studied. The research results show that the maximum settlement of the operating tunnel caused by underpass construction without reinforcement is 11.64mm, which exceeds the control value of 10mm, and deformation control measures must be taken. After reinforcement, the maximum settlement of the soil around Line 3 is only 5.65mm, the reduction of settlement about 50%, and the settlement control effect is obvious, which shows that it is feasible to take deformation control measures for pre-reinforcement of the soil around the tunnel.

Study on Deformation Law of Subway Construction under Passing Existing Line in Short Distance

“…Yang et al [11] studied the effect of shield construction on the settlement of an existing subway tunnel. Zhang et al [12] carried out the reinforcement optimization design for the Metro Shield tunneling under the existing railway; Lv et al [13] studied the evaluation and treatment of the subway tunnel passing under the bridge at a short distance; Zhang [14] Studied the construction of a new subway tunnel to pass under the operating subway tunnel at a short distance; Yang and Wang [15] carried out a study on the settlement control of the tunnel passing through the subway station closely; Zhang et al [16] carried out the deformation analysis of the adjacent Metro Shield tunnel; Liao et al [17] studied the construction disturbance and control of subway tunnel passing through under the highway for a long distance. Most of the previous studies have investigated the effect of disturbance of a tunnel passing through a subway at a short distance by the numerical simulation [18][19][20][21].…”