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

Luo, Chenxu; Cheng, Y; Bai, Zhe; Shen, Tong; Wu, Xuyang; Wang, Qingguo

doi:10.1155/2021/6626927

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…Zhang and Huang [3] studied the soil disturbance caused by multi-line tunnel construction in a soft-soil area, and the interaction mechanism for adjacent structures, such as the existing above-crossing and down-crossing subway tunnels. Similarly, there are many cases in which new rail transit undercrosses existing tunnels, which have been studied by many scholars [11][12][13][14][15][16][17][18][19][20][21][22]. For example, Lai et al [23] proposed a new method for predicting the ground settlement caused by double tunnels penetrating the existing tunnel, on the basis of a comprehensive consideration of the coupling effect of the front tunnel, the intermediate soil mass, the back tunnel, and the existing tunnel.…”

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confidence: 99%

Study on the Influence of an Under-Crossing Parallel Double-Line Shield Tunnel on the Existing Tunnel Structure

et al. 2023

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Extra care should be taken when new tunnels pass through an existing tunnel. If it is not handled properly, this will affect the operation safety of the existing line, and bring security risks to the train’s operation. In order to study the impact of an under-crossing parallel double-line shield tunnel on the existing shield tunnel structure, the influence of tunnel construction on the deformation of overlying strata was analyzed, and the formula for estimating the formation settlement at depth Z below the surface, caused by the excavation of a double-tunnel parallel tunnel, was deduced. Then, a series of three-dimensional finite element numerical simulations were carried out. We analyzed and systematically studied the adverse effects of the tunnel structure of Guangzhou subway Line 5, caused by the tunneling of subway Line 18, evaluated its structure and operational safety, and provided suggestions for site construction. This research demonstrates the following conclusions. (1) The tunnel structures of subway Line 5 and Line 18 are mainly in the strongly weathered argillaceous siltstone stratum, and lightly weathered argillaceous siltstone stratum, respectively, and the stratum where the Line 18 tunnel is located is relatively safe. (2) According to three-dimensional finite element numerical simulation analysis, during the shield-tunneling process of subway Line 18, the maximum X horizontal displacement, the maximum Y horizontal displacement, and the maximum Z vertical displacement of the tunnel structure in subway Line 5 are 1.09, 3.50, and 4.55 mm, respectively. It is considered that the impact of the shield-tunnel penetration of subway Line 18 on the tunnel structure of subway Line 5 is relatively controllable, and does not affect the structure and operational safety. (3) It is suggested that settlement monitoring should be strengthened within the range of 12 m (about 1.5 tunnel diameter D). before and after the excavation axis of the underpass tunnel, and it is necessary to carry out local reinforcement treatment, to prevent adverse effects on the operation of the existing tunnel.

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Section: Introductionmentioning

confidence: 99%

Study on the Influence of an Under-Crossing Parallel Double-Line Shield Tunnel on the Existing Tunnel Structure

et al. 2023

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Study on Deformation of New Tunnels Overcrossing Existing Tunnels Underneath Operating Railways

Xie,

Qu,

et al. 2024

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With the increasing utilization of urban underground space, new tunnels frequently intersect with existing tunnels and operational railways. However, sometimes the excavation and unloading of new tunnels can cause deformation of adjacent existing tunnels and railways, significantly affecting their normal operation. We used finite element software to predict the influence of new tunnel construction on overcrossing existing tunnels and down-traversing operational railways by a dynamic tunneling model based on a connection channel project of the east and west squares of a railway station. This article is not only control the distance between the two tunnels, but the new tunnel and the existing tunnel, as well as the new tunnel and the operation of the railway, the positional relationship between the three, the deformation laws of existing tunnels and operational railways during the construction of new tunnels with different buried depths are analyzed. The results show that the deformation curves of existing tunnels and operational railways present a normal distribution. The maximum deformation position is at the intersection with the new tunnel upon completion of the new tunnel excavation construction. Moreover, an increase in the buried depth of the new tunnel increases the deformation of the operational railway and the existing tunnel. The influence of the depth change of the new tunnel on the settlement of the operational railway is greater than that of the existing tunnel.

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

Cited by 2 publications

References 27 publications

Study on the Influence of an Under-Crossing Parallel Double-Line Shield Tunnel on the Existing Tunnel Structure

Study on the Influence of an Under-Crossing Parallel Double-Line Shield Tunnel on the Existing Tunnel Structure

Study on Deformation of New Tunnels Overcrossing Existing Tunnels Underneath Operating Railways

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