考虑位移释放的横观各向同性冻胀
寒区隧道冻胀力弹塑性解答

doi:10.16285/j.rsm.2021.0635

Rock and Soil Mechanics ›› 2021, Vol. 42 ›› Issue (11): 2967-2976.doi: 10.16285/j.rsm.2021.0635

• Fundamental Theroy and Experimental Research • Previous Articles Next Articles

An elastic-plastic solution for frost heaving force of cold region tunnels considering transversely isotropic frost heave and displacement release

ZHANG Chang-guang^{1, 2}, GAO Ben-xian³, LI Tian-bin², SHAN Ye-peng⁴

1. School of Civil Engineering, Chang’an University, Xi’an, Shaanxi 710061, China; 2. Stake Key Laboratory of Geohazard Prevetion and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 3. School of Highway, Chang’an University, Xi’an, Shaanxi 710064, China; 4. School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044, China

Received:2021-04-26 Revised:2021-07-20 Online:2021-11-11 Published:2021-11-12
Supported by:
This work was supported by the National Natural Science Foundation of China (41202191), the Opening Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (SKLGP2020K022) and the Fundamental Research Funds for the Central Universities of Chang’an University (300102280108).

Abstract

Abstract: The elastic solution and the unified plastic solution for the frost heaving force of tunnels in cold region as well as the implicit equation of plastic zone radius were proposed in this study based on the overall freeze-thaw circle frost heave model. The proposed solution can comprehensively account for the influences of the intermediate principal stress, the transverse isotropic frost heave and the displacement release of surrounding rock. Meanwhile, an approach was provided to determine the elastic-plastic state of frozen surrounding rock. Furthermore, comparability analysis and verification of the proposed solution were performed. The effects of various factors on the frost heaving force and plastic zone radius were investigated. Finally, the distance description of the surrounding rock displacement release was quantified through the supporting time. It was found that the proposed solution has good comparability and was verified by model tests in reference. As the yield criterion of frozen surrounding rock, the unified strength theory can fully make use of its bearing potentiality, the frost heaving force and plastic zone radius are decreased obviously. The frost heaving force and plastic zone radius are significantly affected by the anisotropic frost heave coefficient and the volume frost heave ratio. Therefore, it is necessary to consider the transverse isotropic frost heave of surrounding rock and take effective measures of tunnel waterproofing and drainage as well as insulation and frost resistance. The frost heaving force is large when the displacement release coefficient is small, while the plastic zone radius reaches its peak value when the displacement release coefficient reaches one. Therefore, a proper supporting time is beneficial to the safety of construction and operation for tunnels in cold region. The obtained results can provide some theoretical guidance for the design of tunnels in cold region.

Key words: cold region tunnel, unified strength theory, frost heaving force, displacement release coefficient, transversely isotropic frost heave

CLC Number:

TU 457

ZHANG Chang-guang, GAO Ben-xian, LI Tian-bin, SHAN Ye-peng, . An elastic-plastic solution for frost heaving force of cold region tunnels considering transversely isotropic frost heave and displacement release[J].Rock and Soil Mechanics, 2021, 42(11): 2967-2976.

References

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