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The tunnel wall collapse and pothole creation on the hilly terrain surface: a case study of stabilization

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Abstract

An approximately 2-km-long tunnel is located in the heart of the Bailadila hills in India and is used for the transportation of iron ore excavated from nearby mines. A portion measuring 2 m height and 5 m width of the Reinforced Cement Concrete (RCC) wall of this tunnel was severely ruptured and caved in bringing a lot of debris and the slush. This caused subsidence on the hilly terrain surface exactly overlying the affected tunnel portion. Various stabilization measures consisting of cement grouting in tandem with chemicals were undertaken to strengthen the failed concrete lining as well as the rock and soil mass of tunnel walls and roof in and around the collapsed portion. Additional stabilization measures were also undertaken to back-fill the cavity/pothole formed on the hilly terrain surface. Further, monitoring of the stabilized zone was carried out by installing mechanical type convergence indicators in the tunnel walls and roof. Also, the efficacy of grout was estimated using an ultrasound sonic tester and through Schmidt hammer rebound tests. The paper presents this case study along with the conclusions and recommendations, which were drawn based on this study.

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Acknowledgements

Thanks are due to M/s NMDC Ltd, India, for sponsoring this study. The authors are thankful to the Director, CSIR-CIMFR for his kind permission to publish this paper. Sincere thanks are due to Late (Dr) A. K. Chakraborty for his guidance during the course of the study. Thanks are also due to former colleagues, Mr. B. K. Jha and Mr. S. Kiran for their support during the study. The opinions expressed in this paper, if any, are those of the author's and not necessarily of the institute they belong to.

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  1. Manoj Namdeo Bagde

    Present address: CSIR-Central Institute of Mining and Fuel Research, Nagpur Research Centre, Nagpur, 440 001, India

Authors and Affiliations

  1. CSIR-Central Institute of Mining and Fuel Research, Nagpur Research Centre, Nagpur, 440 001, India

    Subodh Kumbhakar & Jagdish Chandra Jhanwar

  2. CSIR-Central Institute of Mining and Fuel Research, Dhanbad, 826015, India

    Ajit Kumar

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  1. Manoj Namdeo Bagde
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  4. Jagdish Chandra Jhanwar
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Correspondence to Manoj Namdeo Bagde.

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Bagde, M.N., Kumar, A., Kumbhakar, S. et al. The tunnel wall collapse and pothole creation on the hilly terrain surface: a case study of stabilization. Innov. Infrastruct. Solut. 7, 29 (2022). https://doi.org/10.1007/s41062-021-00617-7

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