Journal
ROCK MECHANICS AND ROCK ENGINEERING
Volume 53, Issue 7, Pages 2981-2993Publisher
SPRINGER WIEN
DOI: 10.1007/s00603-020-02108-0
Keywords
Rock bolt; Pull-and-shear test; Analytical model; Jointed rock mass; Open joint
Funding
- National Natural Science Foundation of China [51604299, 41672298]
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A new analytical approach able to predict the mechanical behavior of fully grouted rock bolts subjected to pull-and-shear load is been proposed. The elastic theory of a semi-infinite length beam and approximate differential equation of the deflection curve (elastic and elastoplastic) are employed to analyze the lateral behavior of a bolt under surrounding rock pressures. Bolt axial behavior is based on a realistic tri-linear bond-slip model with residual bond strength at the grout-bolt interface. According to the Tresca yield criterion, important failure parameters such as shear displacement, tangent direction, tensile displacement, and tensile force can be determined via the analytical approach while the shear force and other basic parameters are provided. Results of the proposed analytical approach for 0 degrees, 20 degrees, 40 degrees, 60 degrees, and 90 degrees displacing angles correlate well with experimental test results. Parametric analysis of both the rock and bolt mechanical behavior are also carried out using this new analytical approach.
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