Pull-out behavior of an imperfectly bonded anchor system

A theoretical model of imperfectly bonded anchorage system was analyzed and validated using the ABAQUS code. Based on the proposed model, the axial stress in the anchor and shear stress at the anchor–epoxy interface along the embedded direction have been obtained. Then the slope of the axial stress in anchor along the embedded direction was analyzed and showed a steep drop at the location of imperfect bonding part. This behavior is useful in many engineering projects and can be used to obtain the debonded locations of adhesive layer or fracture zones in surrounding concrete (rocks) during anchor service period. Subsequently, a parametric study is adopted to analyze the distinct effect of composition factors on the behavior of the imperfectly epoxy bonded anchor system (IEBAS). Finally, a field application of the technique was conducted and correlated with the drill hole detector.