Volume 39 Issue 6
Dec.  2025
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Article Navigation >  GEOTECHNICAL ENGINEERING TECHNIQUE  > 2025  >  39(6): 915-921
Wang Rui, Yan Hao, Chen Ruiqi, Yu Jiawu, Xiao Wenhui. Drilling technology and experiment of small aperture anchor cable in weak-broken rock[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(6): 915-921. doi: 10.20265/j.cnki.issn.1007-2993.2024-0408
Citation: Wang Rui, Yan Hao, Chen Ruiqi, Yu Jiawu, Xiao Wenhui. Drilling technology and experiment of small aperture anchor cable in weak-broken rock[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(6): 915-921. doi: 10.20265/j.cnki.issn.1007-2993.2024-0408
shu

Drilling technology and experiment of small aperture anchor cable in weak-broken rock

doi: 10.20265/j.cnki.issn.1007-2993.2024-0408
  • 1.

    Engineering College, Sichuan Normal University, Chengdu 610066, Sichuan, China

  • 2.

    The 2nd Engineering Co., Ltd. of China Railway Tunnel Group, Langfang 065201, Hebei, China

  • 3.

    Shaanxi Youtong Materials Co., Ltd., Xi’an 710000, Shaanxi, China

  • Received Date: 2024-09-06
  • Accepted Date: 2025-03-06
  • Rev Recd Date: 2025-01-08
    • Available Online: 2025-12-08
  • Publish Date: 2025-12-08
    Abstract
  • How to efficiently drill deep anchor hole is a key factor that restricts the application of small aperture prestressed anchor cable system in weak-broken rock. Taking the Muzhailing Highway Tunnel as an example, based on the analysis of key drilling parameters, suitable bolt drilling rig and PDC drilling bit was selected to conduct research on the drilling technology of small aperture anchor cable. The main conclusions are as follows: The selection method of bolt drilling rig based on key parameters such as rotational speed n, shaft thrust F and torque M can effectively realize the reasonable selection of bolt drilling rig. The back rake angle is a key factor affecting the drilling efficiency and service life of PDC drilling tool, and the design should be based on 20°. Properly reducing the back rake angle of PDC drilling bit is helpful to improve the drilling efficiency, and with the decrease of rock strength and the increase of drilling depth, the improvement effect is more and more obvious, but there is a decrease in the service life of PDC drilling bit. The research results are helpful to improve the construction efficiency of small aperture prestressed anchor cable.

     

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