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Abstract <p>Support design in underground mining and tunneling excavations is dependent on the geological and geotechnical behavior of rock mass. The rock mass rating and Q-System are the key parameters to design support system. The existing support system in tunneling projects along Himalayas were studied, and it was observed that the support was lighter in some cases and heavier in others. Based on the real time data obtained from active tunneling projects and geologic conditions along Himalayas the modified support criteria (RMR<sub>19</sub>)&#xa0;using back calculations and incorporating stress factor in RMR and Q have been applied in this study. The stress reduction factor of the Q-system was also studied. The existing and modified RMR and Q are statistically correlated with a significant R<sup>2</sup>&#xa0;value.</p>

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Application of Modified Tunnel Support System for Jointed Rock Mass along Himalayas

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • N. Abbas,
  • K. G. Li,
  • L. Wang,
  • M. Z. Emad,
  • Nasir Abbas

摘要

Abstract

Support design in underground mining and tunneling excavations is dependent on the geological and geotechnical behavior of rock mass. The rock mass rating and Q-System are the key parameters to design support system. The existing support system in tunneling projects along Himalayas were studied, and it was observed that the support was lighter in some cases and heavier in others. Based on the real time data obtained from active tunneling projects and geologic conditions along Himalayas the modified support criteria (RMR19) using back calculations and incorporating stress factor in RMR and Q have been applied in this study. The stress reduction factor of the Q-system was also studied. The existing and modified RMR and Q are statistically correlated with a significant R2 value.