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Volume 44 Issue 10
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ZENG Kai-hua, LI Xue-jun, LU Shou-shan, LI Han-long. Unified plastic solutions to a circular tunnel under two-way unequal pressures and their applications[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(10): 1772-1779. DOI: 10.11779/CJGE202210002
Citation: ZENG Kai-hua, LI Xue-jun, LU Shou-shan, LI Han-long. Unified plastic solutions to a circular tunnel under two-way unequal pressures and their applications[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(10): 1772-1779. DOI: 10.11779/CJGE202210002
shu

Unified plastic solutions to a circular tunnel under two-way unequal pressures and their applications

  • 1.

    School of Civil and Architectural Engineering, Nanchang Institute of Technology, Nanchang 330099, China

  • 2.

    Jiangxi Transportation Institute Co., Ltd., Nanchang 330200, China

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  • Received Date: October 12, 2021
  • Available Online: December 11, 2022
    Graphical Abstract
    • Abstract
  • Various unified plastic solutions to a circular tunnel under two-way unequal pressures are presented corresponding with the in-situ stress distributions, such as the stress, displacement and radius of plastic zone and the ground response curve, where the elastic perfectly-plastic model is assumed for surrounding rock. The unified strength theory and a non-associated flow rule are adopted to account for the effects of the intermediate principal stress and dilatancy, respectively. Discussions and applications of the proposed solution are then performed. The results show that the unified plastic solutions of this study are the serialized and ordered ones with simple expressions, which reasonably consider the effects of three factors to have certain theoretical significance and good engineering application prospect. The two-way unequal pressures and the intermediate principal stress significantly affect the range of plastic zone, displacement of tunnel wall and the ground response curve. The supports with different bearing performances (or installation time) should be applied for different azimuth angles. The displacement of tunnel wall and stable deformation of surrounding rock increase with the increase of the dilatancy coefficient.
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