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<p>This study proposes a method for quickly determining the principal stress difference and the principal stress direction through analysis of the cross-sectional shape of a borehole. The correlation between the geometric morphology of borehole cross-sections and principal stress difference as well as its direction is established. An in-situ measurement equipment for borehole diametrical deformation was developed, which can perceive and measure the displacement in multiple directions of the borehole section, thereby fitting the shape of the borehole section. In-situ experiments were conducted at a depth of 720&#xa0;m in a deep phosphate mine, and the stress states of two measurement points were obtained. The principal stress differences were 14.50 and 15.02&#xa0;MPa, whereas the principal stress directions were N72°W and N86°W. The research results indicate that the measurement equipment can quickly obtain the cross-sectional shape of the borehole and evaluate the stress state, thereby eliminating the dependence on intact rock cores. Although the initial diameter of the borehole affects the determination of the magnitude of the principal stress, quickly determining the principal stress difference and the principal stress direction is essential for engineering design.</p>

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In-Situ Evaluation Method for Principal Stress Difference and Principal Stress Direction Based on Borehole Cross-Sectional Shape Measurement

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Chao Wang,
  • Zengqiang Han,
  • Yiteng Wang,
  • Shicong Huang

摘要

This study proposes a method for quickly determining the principal stress difference and the principal stress direction through analysis of the cross-sectional shape of a borehole. The correlation between the geometric morphology of borehole cross-sections and principal stress difference as well as its direction is established. An in-situ measurement equipment for borehole diametrical deformation was developed, which can perceive and measure the displacement in multiple directions of the borehole section, thereby fitting the shape of the borehole section. In-situ experiments were conducted at a depth of 720 m in a deep phosphate mine, and the stress states of two measurement points were obtained. The principal stress differences were 14.50 and 15.02 MPa, whereas the principal stress directions were N72°W and N86°W. The research results indicate that the measurement equipment can quickly obtain the cross-sectional shape of the borehole and evaluate the stress state, thereby eliminating the dependence on intact rock cores. Although the initial diameter of the borehole affects the determination of the magnitude of the principal stress, quickly determining the principal stress difference and the principal stress direction is essential for engineering design.