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<p>North-eastern (NE) India is developing rapidly in tunneling with its construction of transportation infrastructures such as railways and highways. The objectives of this study highlight the importance of the empirical and numerical approach for the support designing of railway tunnel between Jiribam-Imphal, Manipur, India. The tunneling quality index (Q- system) rock mass rating (RMR) and geological strength index (GSI) rock mass classification systems were used to geotechnical characterization of rock mass such as such as unconfined compressive strength, deformation modulus and Hoek-Brown parameters. The primary support systems include shotcrete, rock bolts and lattice girder were recommended based on rock mass classification systems. Further, the sequential excavation method (split-load factor) was utilized for the unsupported and supported cased were analysed based on two-dimensional finite element numerical analyses viz. RS<sup>2</sup> (rock and soil 2D, also known as Phase<sup>2D</sup>). The plastic zone radius (<i>R</i><sub><i>p</i></sub>) and maximum total displacement (<i>U</i><sub><i>max</i></sub>) around both supported and unsupported tunnel openings in different geotechnical units has been estimated to simulate the effectiveness of support design and sequential excavation. Furthermore, based on the strain limits (deformation) the efficacy of recommended support system was discussed. These finding contribute to the effectiveness of the recommended support systems design for a railway tunnel being constructed in North-East Himalayan for their safety and long-term stability.</p>

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Stability Assessment of Tunnel-Support System Based on Strain Criterion: A Case Study of Manipur Railway Line Project, India

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • Pawan Kishor Sah,
  • Santosh Kumar Singh,
  • Shiv Shankar Kumar,
  • A. Murali Krishna

摘要

North-eastern (NE) India is developing rapidly in tunneling with its construction of transportation infrastructures such as railways and highways. The objectives of this study highlight the importance of the empirical and numerical approach for the support designing of railway tunnel between Jiribam-Imphal, Manipur, India. The tunneling quality index (Q- system) rock mass rating (RMR) and geological strength index (GSI) rock mass classification systems were used to geotechnical characterization of rock mass such as such as unconfined compressive strength, deformation modulus and Hoek-Brown parameters. The primary support systems include shotcrete, rock bolts and lattice girder were recommended based on rock mass classification systems. Further, the sequential excavation method (split-load factor) was utilized for the unsupported and supported cased were analysed based on two-dimensional finite element numerical analyses viz. RS2 (rock and soil 2D, also known as Phase2D). The plastic zone radius (Rp) and maximum total displacement (Umax) around both supported and unsupported tunnel openings in different geotechnical units has been estimated to simulate the effectiveness of support design and sequential excavation. Furthermore, based on the strain limits (deformation) the efficacy of recommended support system was discussed. These finding contribute to the effectiveness of the recommended support systems design for a railway tunnel being constructed in North-East Himalayan for their safety and long-term stability.