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<p>The Palamuru Ranga Reddy Lift Irrigation Scheme (PRLIS) is a major lift irrigation project in Telangana, India. It includes lifting 90 TMC of water from the Srisailam reservoirs back water to higher elevations for irrigation and drinking purposes. This study focuses on the engineering geological characterization and the subsequent support system design for five draft tube tunnels within Package-16 of the PRLIS. Rock mass conditions were evaluated using the Q-System of classification, integrated with three-dimensional geological mapping and the Norwegian Method of Tunneling (NMT) to develop site-specific support strategies. The tunnels generally exhibited fair to good rock mass quality, with Q-values ranging from 5.10 to 23.8. However, intersecting joint sets introduced localized instability, necessitating targeted reinforcement measures. The adopted support system comprising rock bolts, steel-fibre-reinforced shotcrete, and steel ribs were optimized for structural safety, cost-effectiveness, and long-term durability. Draft tube tunnel-1 required additional reinforcement due to diverse geological complexities. Findings highlight the necessity of adaptive support design in granitic terrains and provide practical insights for tunnel construction in comparable geological settings.</p>

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Engineering geological assessment and support design for draft tube tunnels in the Palamuru Ranga Reddy Lift Irrigation Scheme, challenges in granitic terrains

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月12日

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  • P. Lingaswamy,
  • D. S. Rawat,
  • A. K. Naithani,
  • M. A. Azad,
  • L. G. Singh,
  • Prasnna Jain,
  • R. N. S. Babu

摘要

The Palamuru Ranga Reddy Lift Irrigation Scheme (PRLIS) is a major lift irrigation project in Telangana, India. It includes lifting 90 TMC of water from the Srisailam reservoirs back water to higher elevations for irrigation and drinking purposes. This study focuses on the engineering geological characterization and the subsequent support system design for five draft tube tunnels within Package-16 of the PRLIS. Rock mass conditions were evaluated using the Q-System of classification, integrated with three-dimensional geological mapping and the Norwegian Method of Tunneling (NMT) to develop site-specific support strategies. The tunnels generally exhibited fair to good rock mass quality, with Q-values ranging from 5.10 to 23.8. However, intersecting joint sets introduced localized instability, necessitating targeted reinforcement measures. The adopted support system comprising rock bolts, steel-fibre-reinforced shotcrete, and steel ribs were optimized for structural safety, cost-effectiveness, and long-term durability. Draft tube tunnel-1 required additional reinforcement due to diverse geological complexities. Findings highlight the necessity of adaptive support design in granitic terrains and provide practical insights for tunnel construction in comparable geological settings.