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<p>In underground engineering, understanding rock strength parameters is fundamental for rock classification and evaluation, significantly influencing the design and optimization of support systems. Present research emphasizes real-time assessment methods for rock conditions during drilling operations. Employing the dimensionless rock drillability index (I<sub>d</sub>) proposed in connection with Measurement While Drilling (MWD), it allows real-time evaluation of geological conditions in the surrounding rock through in-situ drilling tests. This study conducted in-situ drilling tests using both the MWD system and a drilling camera detection system. The results indicate a power function relationship (negative correlation) between I<sub>d</sub> and rock strength (uniaxial compressive strength). Furthermore, under various drilling conditions, including the use of Polycrystalline Diamond Compact (PDC) bits and core bits, I<sub>d</sub> continues to be a reliable method for assessing rock strength. A comparison of results from the two evaluation methods, I<sub>d</sub> and specific energy, demonstrates that the application scope and stability of using I<sub>d</sub> to assess rock strength superiors that of specific energy. Significant fluctuations in I<sub>d</sub> within rock fracture zones suggest that I<sub>d</sub> can accurately predict the presence of such zones. These findings affirm that I<sub>d</sub> is stable and widely applicable for assessing the strength of the surrounding rock and predicting the presence of fracture zones.</p>

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Real-time rock strength and fractures determination based on Measurement while drilling method via rock drillability index: an in-situ study

  • 期刊论文

  • 发表日期：

    2025年1月28日

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  • Fangyuan Xiao,
  • Kai Zhang,
  • Xinran Xue,
  • Bailong Ma,
  • Tao Jiang,
  • Lianjie Fu

摘要

In underground engineering, understanding rock strength parameters is fundamental for rock classification and evaluation, significantly influencing the design and optimization of support systems. Present research emphasizes real-time assessment methods for rock conditions during drilling operations. Employing the dimensionless rock drillability index (Id) proposed in connection with Measurement While Drilling (MWD), it allows real-time evaluation of geological conditions in the surrounding rock through in-situ drilling tests. This study conducted in-situ drilling tests using both the MWD system and a drilling camera detection system. The results indicate a power function relationship (negative correlation) between Id and rock strength (uniaxial compressive strength). Furthermore, under various drilling conditions, including the use of Polycrystalline Diamond Compact (PDC) bits and core bits, Id continues to be a reliable method for assessing rock strength. A comparison of results from the two evaluation methods, Id and specific energy, demonstrates that the application scope and stability of using Id to assess rock strength superiors that of specific energy. Significant fluctuations in Id within rock fracture zones suggest that Id can accurately predict the presence of such zones. These findings affirm that Id is stable and widely applicable for assessing the strength of the surrounding rock and predicting the presence of fracture zones.