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June 20, 2026International Journal for Numerical and Analytical Methods in Geomechanics

A Framework for In Situ Rock UCS Assessment and Full‐Hole Strength Inversion Integrating MWD Signals and Symbolic Regression Strategies

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Authors

SHShuai HuangCentral South UniversityJZJian ZhouShanghai Ninth People's HospitalWYWeixun YongCentral South University

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Overview

Randomized trial develops a UCS assessment framework capturing rock strength through MWD signals, highlighting predictive capabilities.

Key Points

  • To develop a framework for in situ estimation of uniaxial compressive strength (UCS) using measurement while drilling (MWD) signals.
  • Field drilling of 297 m to collect continuous MWD data including penetration rate and torque.
  • Application of symbolic regression, specifically STLSQ–SINDy, to derive relationships between MWD parameters and UCS.
  • Leave-one-hole-out cross-hole validation to ensure model stability and transferability between boreholes.
  • STLSQ–SINDy achieves R² of 0.9413 and RMSE of 5.53 MPa for UCS predictions.
  • Under cross-hole validation, STLSQ–SINDy shows a mean test R² of 0.8709 ± 0.0471.
  • Successful reconstruction of rock UCS profiles reveals stratified strength hierarchy across five boreholes.

Cite This Study

Huang et al. (2026) studied this question.

synapsesocial.com/papers/6a3631a1db0793dc1a5387bfhttps://doi.org/10.1002/nag.70368
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