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Settlement characteristics due to excavate twin tunnels in a supported slope: model test and numerical simulation

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Abstract

Traffic issues are a result of rising population, expanding urbanization, and rising living standards. Consequently, there is a growing demand for the urban rail and road transport network to evolve. Twin tunnel excavation through a slope is seen to be a key safety hazard. Settlement is the outcome of the stress being released during excavation. Thus, the prediction of the displacement and stresses in underground openings especially in a slope represent a challenging task. Moreover, it is very important to support the slope during the excavating. This paper studies a (fill-rock) slope using two major supporting tools: plates and an equivalent section of rows of piles. In addition to a slope without any support. The effectiveness of each assistance system has been compared. For the top layer of the slope, which is fill soil, two constitutive models—Mohr–Coulomb (M-C) and hardening soil (HS)—have been utilized. However, the results show good agreement between the physical model and the numerical simulation (FEM). Additionally, the Mohr–Coulomb (M-C) model is more appropriate than the hardening soil (HS) model as a constitutive model for the fill soil.

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Funding

This work was supported by the National Key R&D Program of China (Grant No. 581 2018YFC1504802), National Natural Science Foundation of China (Grant No.41972266).

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Authors and Affiliations

  1. College of Civil Engineering, Chongqing University, Chongqing, 400045, China

    Xinrong Liu, Lojain Suliman & Xiaohan Zhou

  2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China

    Xinrong Liu, Lojain Suliman & Xiaohan Zhou

  3. National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas (Chongqing), Chongqing, 400045, China

    Xinrong Liu, Lojain Suliman & Xiaohan Zhou

  4. National Authorities for Tunnels, Cairo, Egypt

    Ahmed abd elmageed

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  1. Xinrong Liu
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  2. Lojain Suliman
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  4. Ahmed abd elmageed
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Correspondence to Xiaohan Zhou.

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Responsible Editor: Zeynal Abiddin Erguler

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Liu, X., Suliman, L., Zhou, X. et al. Settlement characteristics due to excavate twin tunnels in a supported slope: model test and numerical simulation. Arab J Geosci 16, 411 (2023). https://doi.org/10.1007/s12517-023-11421-1

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  • DOI: https://doi.org/10.1007/s12517-023-11421-1

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