Excavation influence of triangular-distribution tunnels for wind pavilion group of a metro station
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Excavation influence of triangular-distribution tunnels for wind pavilion group of a metro station CHEN Tao(陈涛)1, 2, ZHOU Kun(周坤)3, WEI Jun(卫军)1, LIU Xiao-chun(刘晓春)1, LIN Yu-liang(林宇亮)1, ZHANG Jian(张箭)3, SHEN Quan(申权)4 1. School of Civil Engineering, Central South University, Changsha 410075, China; 2. China Railway City Development and Investment Group Co., Ltd., Chengdu 610000, China; 3. Key Laboratory for Geomechanics and Embankment Engineering of Ministry of Education, Hohai University, Nanjing 210024, China; 4. School of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: For the Guanshui Road Station tunnel project of Guiyang Metro Line 2, the wind pavilion group was moved out of the main tunnel to reduce the number of openings in the main tunnel, and the wind pavilion group was excavated in a triangular configuration at the entrance of the main tunnel. Based on the finite element software ABAQUS, a three-dimensional model is established to study the influence of different triangular-distribution tunnels excavation schemes on the surface settlement and tunnel stability. The objective of this study is to reveal the change rules of surface settlement, deformation and force in the support structures and the surrounding rock and identify the best excavation scheme for this tunnel configuration. Results show that to control the surface settlement and the deformation of the support structures, the optimal excavation sequence involves excavating the upper fresh air exhaust tunnel before the lower running tunnel. To control the stress of the support structures, the optimal excavation involves excavating the lower running tunnel before the upper fresh air exhaust tunnel. In this project, the most reasonable excavation sequence of the tunnel is from top to bottom. The most reasonable thickness of tunnel penetration is 5 m. Key words: station tunnel; wind pavilion group; finite element analysis; tunnel and surrounding rock deformation; stress analysis Cite this article as: CHEN Tao, ZHOU Kun, WEI Jun, LIU Xiao-chun, LIN Yu-liang, ZHANG Jian, SHEN Quan. Excavation influence of triangular-distribution tunnels for wind pavilion group of a metro station [J]. Journal of Central South University, 2020, 27: . DOI: https://doi.org/10.1007/s11771-020-4468-x.
1 Introduction The wind pavilion group of a subway station includes the exhaust pavilion for discharging dirty air, the fresh air pavilion for delivering fresh air and the piston air pavilion for removing and replacing the piston air caused by a train [1]. Thus, the wind pavilion group is an important subsidiary structure
for ventilation in underground stations [2]. In the conventional design scheme, each wind pavilion is established by excavating holes in the side of the main tunnel of the station. However, these openings damage the main structure of the tunnel and affect its stability. Therefore, it is necessary to optimize the layout of the wind p
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