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| Research on construction parameters of double side heading method considering multiple factors |
| LI Xiangbing1, LIANG Bo1,2*, LU Siyuan1
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1. College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
2. State Key Laboratory of Mountain and Bridge Engineering, Chongqing Jiaotong University, Chongqing 400074, China |
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Abstract The construction parameter optimization research of the double-side heading method usually adopts single factor analysis, which has certain limitations. The research took the Wulidian Subway Station Tunnel Project as the research background, which is one of the first phase projects of Chongqing Rail Transit Line 9. The radius of temporary support, the thickness of the middle rock wall, and the excavation footage were used as influencing factors, and the maximum vertical displacement of the vault and the maximum horizontal displacement of the side wall were used as the calculation indicators. The finite difference software FLAC3D was used to carry out multi-factor numerical simulation analysis. The results showed that the optimal combination of construction parameters obtained by multi factor analysis were that temporary support radius was 23.0 m, medium rock wall thickness was 9.0 m and excavation footage was 0.75 m; the optimal combination obtained by the back analysis of regression method based on the results of multi factor analysis that temporary support radius was 24.0 m, medium rock wall thickness was 8.0 m and excavation footage was 0.8 m. By comparing the maximum vertical displacement of the arch crown and the maximum horizontal displacement of the side wall of the three groups of optimal construction parameters, it was concluded that the construction parameters obtained by regression back analysis based on the results of multi factor analysis have more advantages.
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Received: 10 November 2021
Published: 20 June 2022
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