Abstract
With the large-scale construction of city subways, the down traversing formed by subway running tunnels through the existing railways or railway yards are increasing day by day. Down traversing in shield method becomes common; however, the engineering cases which can be referable in the down traversing formed by the shallow-buried excavation of double-arch tunnels through the existing railways are very little. The ability to effectively control the excavation of shallow-buried subway tunnels can directly affect the safety of railway operation. According to the engineering characteristics of the down traversing formed by the shallow-buried excavation of double-arch tunnels in loessial layer, this paper proposed the standards for railway bed and track settlement control, and offers underground water treatment measures with assistant steps implemented on the ground surface during construction, so as to ensure the railway operation safety during the construction of the tunnel. Moreover, this paper applied MIDAS-GTS finite element software to make numerical simulation analysis of the down traversing formed by the double-arch tunnel through the railway and obtained the deformation laws during down traversing. The calculations suggest the railway track deformation caused by the down traversing construction of the double-arch tunnel in this project can meet related control standard requirements. There’s certain reference value contained in the deformation laws for the point locations of monitoring measurement. The research conclusions can provide scientific proof and technical guidance for the design and construction of this running tunnel project in order to offer reference for similar projects in the future.
Highlights
According to statistics and in combination with the engineering cases of the down traversing formed by domestic subway tunnels through the existing subways or railway yards, down traversing in shield method becomes common
In order to ensure the safety of tunnel construction and railway operation, it is very necessary to study the impact that the excavation construction of shallow-buried tunnels has through the existing railways in loess area
In accordance with the engineering characteristics of the down traversing formed by the shallow-buried excavation of double-arch tunnels through the existing railways in loess area, this paper studied the control standards for the railway settlement caused by the down traversing of the double-arch tunnel, the deformation laws of stratums and tracks, underground water treatment measures and assistant measures for surface construction
Summary
According to statistics and in combination with the engineering cases of the down traversing formed by domestic subway tunnels through the existing subways or railway yards, down traversing in shield method becomes common. In order to verify the feasibility of the design plan and the engineering project, and to ensure the operation safety of the existing railway during the down traversing of the tunnel, this paper established a three-dimensional finite element model for this project and obtained the deformation laws of the railway track during the down traversing period of the tunnel with the key control steps of double-arch tunnel excavation. It proposes suggestions for the layout of monitoring measurement points
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