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<p>In modern pile foundation drilling operations, rotating drilling tools leave a series of irregular joints on rock surfaces. Currently, there are certain limitations in research on the roughness of rock joints. For a more accurate quantification of the roughness of a rock joint under rotary-drilling conditions, the geometry of the rock joint surface was obtained using a three-dimensional non-contact high-precision laser scanner. Twenty joint surface contours were intercepted along the shear direction of the XZ system. The mean height <i>h</i><sub>0</sub> and root mean square (RMS) <i>σ</i> of the centerline reflect the undulation characteristics of the joint surface, and the average inclination angle <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\overline{\theta }}_{\text{p}}\)</EquationSource> </InlineEquation>, which reflects the steepness of the joint surface, is extracted using the contour lines. The method of quantizing roughness with <i>L</i>/<i>L</i><sub>0</sub> was extended to the three-dimensional space <i>S</i>/<i>S</i><sub>0</sub>, and the functional relationship between the three-dimensional joint roughness coefficient (JRC) and <i>σ</i>, <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({\overline{\theta }}_{\text{p}}\)</EquationSource> </InlineEquation> was obtained by bivariate fitting, and the goodness of fit reached 99.46%. The results of two real examples and laboratory direct shear tests demonstrate that the proposed method is similar to other methods, and the numerical variation trend is more stable than that of the classical method, which verifies the feasibility of the proposed method.</p>

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An approach for quantifying the three-dimensional joint roughness coefficient of rock joints during rotary drilling

  • 期刊论文

  • 发表日期：

    2026年2月7日

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  • Renyi Chen,
  • Yonggao Yin,
  • Min He

摘要

In modern pile foundation drilling operations, rotating drilling tools leave a series of irregular joints on rock surfaces. Currently, there are certain limitations in research on the roughness of rock joints. For a more accurate quantification of the roughness of a rock joint under rotary-drilling conditions, the geometry of the rock joint surface was obtained using a three-dimensional non-contact high-precision laser scanner. Twenty joint surface contours were intercepted along the shear direction of the XZ system. The mean height h0 and root mean square (RMS) σ of the centerline reflect the undulation characteristics of the joint surface, and the average inclination angle \({\overline{\theta }}_{\text{p}}\) , which reflects the steepness of the joint surface, is extracted using the contour lines. The method of quantizing roughness with L/L0 was extended to the three-dimensional space S/S0, and the functional relationship between the three-dimensional joint roughness coefficient (JRC) and σ, \({\overline{\theta }}_{\text{p}}\) was obtained by bivariate fitting, and the goodness of fit reached 99.46%. The results of two real examples and laboratory direct shear tests demonstrate that the proposed method is similar to other methods, and the numerical variation trend is more stable than that of the classical method, which verifies the feasibility of the proposed method.