Abstract
In the extra-large cross-section urban subway underground station projects, the key problem is to choose the appropriate excavation method and grasp the mechanical behavior of the surrounding rock after excavation. The double side drift method is widely used in the urban subway underground station construction with extra-large cross-section in China. This paper presents the deformation characteristics of the extra-large cross-section tunnel of urban subway and a comparison with the numerical simulation results. In the city subway underground excavation of large section station, the mechanical behavior of surrounding rock change and its influence on the surrounding area mainly depend on the selection of construction methods. The convergent deformation of tunnel cavern, the subsidence of the surface and the force failure of the surrounding rock associated the construction approaches are demonstrated. This study provides a more in-depth demonstration of the way to optimize the excavation method of the extra-large cross-section tunnel to achieve the purpose of controlling the deformation of the surface and surrounding rock.
Highlights
With development and the urbanization of the city, the underground space development and the utilization of urban development have gradually become significant factors of cities’ sustainable development[1]
It is essential to choose the proper excavation method for the construction of extra-large cross-section urban tunnel, because different excavation methods are of great significance for controlling the ground deformation and wall-rock convergence
For the construction of urban subway tunnels in china, selecting a suitable design and construction method to complete the construction of the extra-large cross-section urban subway tunnel is the most critical factor to complete the whole project
Summary
With development and the urbanization of the city, the underground space development and the utilization of urban development have gradually become significant factors of cities’ sustainable development[1]. For the construction of urban subway tunnels in china, selecting a suitable design and construction method to complete the construction of the extra-large cross-section urban subway tunnel is the most critical factor to complete the whole project. It depends on the reasonable techniques and technologies adopted in the design and construction phase of the project, so as to achieve the goal of the highest construction efficiency and the lowest construction cost. [5] have focus on optimization analysis on construction scheme of large span metro station in hard rock stratum These above researches are not focused on the common problems. It is significant to find out the way to optimize the tunnel excavation method of extra-large cross-section station and the construction mechanics response of large section tunnel excavation
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