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Force system conversion mechanisms of retaining structures for subway excavation in soft soil

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Abstract

The problem of force system balance between earth pressure and retaining structures has received less attention. Therefore, this paper investigates the force system conversion mechanism of retaining structures for braced excavation in soft soil. Based on the measured data at Daliang Station, the deformation characteristics of braced excavation in soft soil were analyzed, and the temperature correction model and prediction methods for strut force were established. Further, the mechanism of force system conversion between earth pressure and retaining structures was discussed. Optimized support schemes were proposed to reduce the excavation displacement and forces. The results show that the maximum wall displacement was 0.02–0.3% of the excavation depth. The effect of temperature on the support force was about 24.9% on average, and the temperature effect on wall displacement was 12.69–38.57%. The proposed temperature correction model can effectively eliminate the temperature effect on the support force. When excavating to the bottom plate, about 70% of the water-and-soil pressure was converted into the internal force of the support structure. And the optimized support schemes resulted in a maximum reduction in wall displacement of 23.7% and an increase of 4.21% in the proportion of water-and-soil pressure converted into support forces. The results help to provide a reference for the design and construction of the subway excavation engineering.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

The authors received financial and technical support provided by the National Key R&D Program of China (Grant No. 2018YFC1505302) and the National Nature Science Foundation of China (Grant Nos. 51678112 and 52278332).

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Authors and Affiliations

  1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China

    Meng Han & Jinqing Jia

  2. School of Civil Engineering, Dalian University of Technology, Dalian, 116024, China

    Meng Han & Jinqing Jia

  3. School of Highway, Chang’an University, Xi’an, 710064, Shaanxi, China

    Zhe Li

  4. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, 518060, China

    Xiaohua Bao

  5. College of Civil Engineering and Architecture, Guangxi University, Nanning, 530004, Guangxi, China

    Guoxiong Mei

  6. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 210096, China

    Lulu Liu

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  1. Meng Han
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  2. Zhe Li
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  3. Jinqing Jia
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Correspondence to Jinqing Jia.

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Han, M., Li, Z., Jia, J. et al. Force system conversion mechanisms of retaining structures for subway excavation in soft soil. Bull Eng Geol Environ 82, 262 (2023). https://doi.org/10.1007/s10064-023-03282-5

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  • DOI: https://doi.org/10.1007/s10064-023-03282-5

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