Correction of Surface Tensile Stress in In-situ Stress Field Inversion Using the Virtual Measuring Point Method

Le résumé fourni par la source

Abstract Surface tensile stress anomalies frequently arise during in-situ stress field inversion via multiple linear regression, compromising result reliability. To resolve this, we propose a novel method integrating distributed surface virtual measuring points with zero stress components. The approach applies boundary displacements to simulate distinct working conditions, computes stress components at both actual and virtual measuring points, and leverages these combined points as control conditions for multi-linear regression inversion. This method uniquely constrains surface stress characteristics while preserving deep-field accuracy, overcoming the limitation of conventional regression that ignores global stress behavior. Validation through an engineering case in Southwest China confirms the method’s efficacy: surface tensile stress zones are significantly mitigated while maintaining acceptable measurement-point errors (<30%), enhancing FEM result plausibility.

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