When subjected to shear loading condition, the bolt is deformed as the joint displacement increases, which can mobilize a normal load and a shear load on the bolt accordingly. An analytical relationship between the displacing angle and loading angle was developed in this paper. By considering elastic and plastic states of rock bolt during shearing, the rotation of bolt extremity can be calculated analytically. Therefore, the loading angle is obtained from displacing angle. The verification between analytical results and laboratory results from reference research implies that the analytical method is correct and working. In terms of in-situ condition, the direction of the load acting on steel bolt can be predicted well while the direction of the deformed rock bolt with respect to original bolt axis is known.
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