首页|Deformation characteristics and safety assessment of a high-speed railway induced by undercutting metro tunnel excavation

Deformation characteristics and safety assessment of a high-speed railway induced by undercutting metro tunnel excavation

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Stratum deformation (settlement) is a challenging issue in tunnel engineering, especially when con-struction of metro tunnels has to undercut high-speed railway. For this purpose, we used the FLAC3D software to analyze the stratum settlement characteristics of high-speed railway at different crossing angles intersected by metro tunnel, in terms of ground settlement trough, stratum slip line and irreg-ularity of ballastless tracks. According to the evolution of the stratum settlement at different angle re-gions, an optimized angle is proposed for the actual project design. In order to reduce the influence of stratum settlement on the safety of high-speed railway, an approach of safety assessment is proposed for the shield engineering undercutting high-speed railway, as per Chinese specifications using numerical results and on-site conditions. A case study is conducted for the shield tunnel section crossing the Wuhan - Guangzhou High-speed Railway between the Guangzhou North Railway Station and the Huacheng Road Station, which represents the first metro tunnel project passing below a high-speed railway in China. A series of measures is taken to ensure the safe excavation of the shield tunnel and the operation of the high-speed railway. The results can provide a technical support for performing a safety evaluation between high-speed railways and metro tunnels.

Metro tunnel excavationHigh-speed railwaySettlement characteristicsSafety assessmentNumerical simulationCase application

Wangping Qian、Taiyue Qi、Yunjian Zhao、Yizhou Le、Haiyang Yi

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Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu, 610031, China

School of Civil Engineering, Southwest Jiaotong University, Chengdu, 610031, China

China Railway Design Corporation, Tianjin, 300142, China

China Changjiang Construction Investment Corp. Ltd., Chengdu, 610000, China

North China Institute of Science and Technology, Langfang, 065201, China

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authors gratefully acknowledge the National Natural Sci-ence Foundation of Chinaauthors gratefully acknowledge the National Natural Sci-ence Foundation of Chinafor its financial support. The authors would like to equally thank Ms. Wenjing Lu from the Affiliated Middle School of Jiangsu N

Grant Nos. 5127842351478395

2019

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCDCSCDSCI
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2019.11(1)
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