Track Alignment and Construction Method Comparison for Adding Stations to Long Metro Intervals in Loess Strata during Preliminary Design Stage
[Objective] To optimize the track-station alignment and construction methods for adding metro stations to long metro intervals in loess strata, a comparative study on economic efficiency and safety is required. [Method] An interval between Hangtiancheng Station and Dongchang’anjie Station on Xi’an M...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Urban Mass Transit Magazine Press
2025-06-01
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| Series: | Chengshi guidao jiaotong yanjiu |
| Subjects: | |
| Online Access: | https://umt1998.tongji.edu.cn/journal/paper/doi/10.16037/j.1007-869x.20230575.html |
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| Summary: | [Objective] To optimize the track-station alignment and construction methods for adding metro stations to long metro intervals in loess strata, a comparative study on economic efficiency and safety is required. [Method] An interval between Hangtiancheng Station and Dongchang’anjie Station on Xi’an Metro Line 15 is taken as the research background, influencing factors related to the additional station in a long metro interval are analyzed, and the horizontal and vertical alignments of the newly added station are optimized and compared. Based on a comparison of eight construction methods including open excavation, mined tunneling, and combinations of open excavation with mined tunneling and so on,two schemes: a three-level underground station using the full PBA (pile-beam-arch) method and a combined method of open excavation for the first and second underground levels with CRD (cross diaphragm method) for the third level are further evaluated. A 3D time-history analysis under E3 seismic loading is conducted for the newly added station. [Result & Conclusion] The additional station in a long metro interval requires comprehensive consideration of adjacent stations, road planning, and risk sources to determine the optimal track-station alignment. When constructing the PBA method deep-buried stations, the foundation bearing capacity is often insufficient. Therefore, the combination of open excavation for the first and second underground levels and CRD for the third underground level construction method is recommended. For deep-buried stations with separate concourse and platform structures under E3 seismic loading, the structural deformation rate remains within the allowable range; however, certain local areas exhibit low safety margins, necessitating the adoption of structural reinforcement measures. |
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| ISSN: | 1007-869X |