ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 27    No. 4    April 2017

Relationship between loading angle and displacing angle in steel bolt shearing
Yu CHEN1,2, Ping CAO1, Ke-ping ZHOU1, Yun TENG1
(1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. Department of Geology and Mineral Resources Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
)
Abstract: When subjected to shear loading condition, a steel rock bolt will become bent in the field close to the loading point in situ. The bolt is deformed as the joint displacement increases, which can mobilize a normal load and a shear load on the bolt accordingly. In this work, the relationship analysis between the displacing angle and loading angle is carried out. By considering elastic and plastic states of rock bolt during shearing, the rotation of bolt extremity can be calculated analytically. Thus, the loading angle is obtained from displacing angle. The verification of 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 according to the direction of the deformed rock bolt with respect to original bolt axis.
Key words: steel rock bolt; shear; displacing angle; loading angle
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU)