Abstract
The interaction between the double-track shield tunnel and the integrated pipe gallery is complex, and there is still a lack of systematic research. Based on the numerical simulation of the Xi’an case, this paper studies the influence of the construction of the integrated pipe gallery on the deformation characteristics of the existing double-line subway tunnels with different buried depths and clear distances and finds the safe buried depth and clear distance of the tunnel. The results indicated that, in the loess area, the maximum deformation of the existing subway has a linear and inverse relationship with the buried depth and spacing, respectively. Increasing the buried depth can reduce the impact of the upper construction disturbance more than increasing the clear distance ratio. Moreove, under the design conditions of constructing a utility tunnel by the open-cut method, when the buried depth of the tunnel is 4.5 D and the spacing is greater than 4.5 D, or the buried depth is 5.0 D and the spacing is greater than 2.5 D, the combination of subway tunnels can meet the deformation control standards.
Highlights
Nowadays, cities are developing at a fast pace and more and more underground buildings are being built. e construction of underground structures will inevitably lead to the change of stress field and displacement field, which will greatly affect the stability of existing underground structures [1–5]
With the development of the utility tunnel, it is urgent to study the influence of the excavation of the utility tunnel on the stability of the existing subway
Aiming at the parallel phenomenon of utility tunnel and subway tunnel, [29] established a three-dimensional model that studied the numerical simulation of the influence of shield tunnel threedimensional dynamic construction process with different support pressures on the comprehensive pipe gallery in the loess area of Xi’an
Summary
Cities are developing at a fast pace and more and more underground buildings are being built. e construction of underground structures will inevitably lead to the change of stress field and displacement field, which will greatly affect the stability of existing underground structures [1–5]. Aiming at the parallel phenomenon of utility tunnel and subway tunnel, [29] established a three-dimensional model that studied the numerical simulation of the influence of shield tunnel threedimensional dynamic construction process with different support pressures on the comprehensive pipe gallery in the loess area of Xi’an. Based on loess in the Xi’an, this paper establishes a numerical model to investigate the influences of pipe gallery tunnel excavation on the lower part of the existing tunnel. It simulates the construction of comprehensive pipe gallery by the open-cut method over an existing subway tunnel under different combinations of cover span and net distance ratios. (1) Finite element method of linear elastic model has been used to calculate each structure of the utility tunnel and the shield tunnel
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