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Theoretical and Experimental Study on Rock Resistance Coefficient of Soft Rock Tunnel Considering Creep Effect

  • Research Article-Civil Engineering
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Abstract

Creep deformation properties of soft rock are studied based on the visco-elastoplastic model. Combining with the generalized Hoek–Brown criterion, the calculation formula for rock resistance coefficient (RRC) of soft rock tunnel is deduced based on the creep effect, and the formula is applied to Tianjiashan tunnel, which is a typical soft rock tunnel. Besides, the influences of creep effect and tunnel buried depth on RRC are discussed. As shown in the results, the RRC which takes creep effect into consideration is declined, and the RRC decreases with the increase of tunnel depth and in situ stress. After the creep effect of surrounding rock is fully developed, the values of RRC are from 140.92 to 24.09 MP m−1 at different buried depth, which indicates that although soft rock tunnels have poor stability, the surrounding rock still possess certain elastic resistance and self-bearing capacity.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Number. 41672260) and the Science Foundation of Project of Hunan Department of Education (Grant Number. 19C0736). We gratefully acknowledge China Railway 14th Bureau Group Co., Ltd. and Changjiang River Scientific Research Inst. of Changjiang Water Resources Commission for their valuable cooperation in the field test and data collection in Tianjiashan tunnel.

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Authors and Affiliations

  1. Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring, School of Civil Engineering, Hunan University of Science and Technology, Xiangtan, China

    Yaxiong Peng & Yonglin An

  2. Faculty of Engineering, China University of Geosciences, Wuhan, China

    Li Wu & Hanhua Peng

  3. Central South Exploration & Foundation Engineering Co., Ltd, Wuhan, China

    Hanhua Peng

  4. School of Urban Construction, Yangtze University, Jingzhou, China

    Yong Hao

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  1. Yaxiong Peng
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  2. Li Wu
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  3. Hanhua Peng
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  5. Yonglin An
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Correspondence to Yaxiong Peng.

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Peng, Y., Wu, L., Peng, H. et al. Theoretical and Experimental Study on Rock Resistance Coefficient of Soft Rock Tunnel Considering Creep Effect. Arab J Sci Eng 45, 4333–4342 (2020). https://doi.org/10.1007/s13369-020-04452-3

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  • DOI: https://doi.org/10.1007/s13369-020-04452-3

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