A New Method for Prediction of Rock Quality Designation in Borehole Using Energy of Rotary Drilling

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Abbreviations

RQD:

Rock quality designation

RQDd :

Developed rock quality designation from drilling

e :

Specific energy

A :

Excavation area

F :

Thrust force-on-bit

v :

Penetration rate

M :

Torque-on-bit

w :

Rotation speed

h :

Penetration per rotation for rotary drilling, h = 60v/w

f :

Value of the specific energy after using data normalization method

e min :

Minimum value of the specific energy in total length range

e max :

Maximum value of the specific energy in total length range

s :

Standard deviation of f

H :

Curve-fitting parameter for the RQDd–s curve

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Acknowledgements

This study is sponsored by the National Natural Science Foundation of China (Grants no. 11902249 and 51779207) and the Project of Scientific Research of Shanxi Province (Grant no. 2019JQ395). The financial support provided by this sponsor is greatly appreciated. The authors would like to thank Prof. G. Barla, reviewers and editors for their suggestions.

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He, M.M., Li, N., Yao, X.C. et al. A New Method for Prediction of Rock Quality Designation in Borehole Using Energy of Rotary Drilling. Rock Mech Rock Eng 53, 3383–3394 (2020). https://doi.org/10.1007/s00603-020-02091-6

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Keywords

  • Rock quality designation prediction
  • Rotary drilling energy
  • Rock mass classification
  • Standard deviation