Abstract The deformation pattern of existing tunnels caused by the crossing construction of new urban rail proj? ects is a popular research topic in the engineering field. Based on a new shield tunnel passing under an existing one in close distance, this paper collates the actual measured data during the whole construction process. And in combination with the calculation results of the numerical model, it mainly analyzes the settlement deformation pattern of the existing double-line tunnel during the crossing construction process of the new left and right line tunnel tubes in turn, and further analyzes the stability of the disturbed soils in each construction stage. The results show that: (1)from the time dimension, there is a one-to-one correspondence between the vertical deformation trend of the existing structure and the construction stage during the crossing process; (2) from the distance dimension, the deformation of the tunnel structure increases as the distance from the crossing center decreases, and the pattern is consistent with the simulation results; (3) based on the amount and rate of deformations in the existing tunnel, the start stage of the crossing construction can be taken as a key node for controlling the settlement; (4) the settlement of the center area crossing the existing tunnel is much smaller than the simulated value, with achieving the actual redistribution of the settlement deformation, which verifies the effectiveness of construction key node control and the accuracy of the conclusions.
Abstract：
The deformation pattern of existing tunnels caused by the crossing construction of new urban rail proj? ects is a popular research topic in the engineering field. Based on a new shield tunnel passing under an existing one in close distance, this paper collates the actual measured data during the whole construction process. And in combination with the calculation results of the numerical model, it mainly analyzes the settlement deformation pattern of the existing double-line tunnel during the crossing construction process of the new left and right line tunnel tubes in turn, and further analyzes the stability of the disturbed soils in each construction stage. The results show that: (1)from the time dimension, there is a one-to-one correspondence between the vertical deformation trend of the existing structure and the construction stage during the crossing process; (2) from the distance dimension, the deformation of the tunnel structure increases as the distance from the crossing center decreases, and the pattern is consistent with the simulation results; (3) based on the amount and rate of deformations in the existing tunnel, the start stage of the crossing construction can be taken as a key node for controlling the settlement; (4) the settlement of the center area crossing the existing tunnel is much smaller than the simulated value, with achieving the actual redistribution of the settlement deformation, which verifies the effectiveness of construction key node control and the accuracy of the conclusions.
GAO Lihong
.Analysis of Settlement Deformation and Construction Node Control of a Double-Line Shield Tunnelling Passing under Existing Tunnel in Close Distance[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(4): 194-202
2021, Vol. 58 