Assessment of in-situ stresses under bi-axial stress state using concrete core trepanning technique employs a three element strain gage rosette to measure the strain release due to core drilling. Numerical studies were conducted to evaluate the reliability of the concrete core trepanning technique under biaxial stress field. This paper describes the development of methodology of concrete core trepanning technique for measuring in-situ biaxial stresses of concrete structures. The suitability of this technique was established by finite element analysis, on a model with known stress/strain field.

Keywords: In-situ stress, Concrete core trepanning technique, Finite element analysis.