Construction Method Optimization for Transfer Section Between Cross Passage and Main Tunnel of Metro Station

P Y Zhou,Z P Song,Z M Pei,Z L Cao,J B Wang

doi:10.3389/feart.2022.770888

P Y Zhou, Z P Song + Show 3 more

Open Access

https://doi.org/10.3389/feart.2022.770888

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Abstract

The transfer section between the cross passage and the main tunnel is the part that needs to be paid attention to during the underground excavation construction of the subway. Due to complex stress, the collapse of the horsehead gate and excessive surface settlement often occur. In order to determine the construction scheme of the transfer section between the cross passage and the main tunnel of Guanshui Road Station of Metro Line two in Guiyang, China, the numerical simulation method was used to analyze the “double-holes interval pillar method,” “sector expansion method,” and “gate climbing method,”, respectively. The mechanical response of the surrounding rock and supporting structure under each method was compared. The comparisons showed that the surface settlement, the displacement of the cave, and the plastic zone caused by the double-holes interval pillar method were the smallest, and the method can reduce the construction risk, shorten the construction period, and reduce the project cost. Therefore, it was recommended to use the double-holes interval pillar method to construct the transfer section. The comparison between the measured data and the numerical simulation results of the double-holes interval pillar method showed that the numerical simulation results were smaller than the measured data at each point, and the surface settlement and horizontal displacement in the tunnel both met the safety control standard.

Highlights

With the increase of underground tunnel construction, underground caverns are often used for energy storage
This paper studied the mechanical response of the transfer section between the cross passage and the main tunnel in the construction of Guanshui Metro station on Guiyang Metro line 2 in China
This paper adopted three methods, the double-holes interval pillar method, sector expansion method, and gate climbing method to carry out a series of numerical analyses for the Guanshui Road Station of Guiyang City Metro line 2 in Guizhou Province, China on the construction of the transfer section

Summary

Introduction

With the increase of underground tunnel construction, underground caverns are often used for energy storage. To ensure the safety of energy storage, builders must first ensure the construction safety of underground caverns (Comodromos et al, 2014; Ramos et al, 2018; Fan et al, 2019; Kang et al, 2021). The construction of an underground tunnel is complex Et al, 2020; Lv et al, 2020; Li et al, 2021), especially at the junction of a variable section. In order to reduce the impact on ground traffic, the undercutting method is usually used in the construction of an urban Metro with dense buildings (Bobet, 2001; Khademian et al, 2017; Cao et al, 2018; Moosavi et al, 2018; Li et al, 2019; Wang et al, 2021b). The cross passage near the Metro station is used as the connection part between the shaft and the main tunnel, and this transfer section between the shaft and the main tunnel is the key section of Metro station

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Results

Conclusion