Elastic stress distributions： axial and shear stress distributions in an anchor bolt during a pullout test
Abstract：Planar and 3-D mechanical models were used to test rock-bolt pull out. The results were used to derive formulas for the axial force and bond shear stress in the bolt under elastic conditions. A new term, the decay of shear stress coefficient, is proposed that has an obvious effect on the stress distributions. Theoretical estimates of how cement or resin-anchored bolt stresses decay in sandstone rock are presented. These estimates are then compared to bolt properties in a coal body. Axial force and grout shear stress in soft rock are found to be distrib- uted along the entire length of the bolt. However, in hard rock the axial force decays rapidly, dropping by 95 percent along 80 to 100 cm in the grout. The grout shear stress decays to 0.06 MPa within about 40 to 50 cm in the grout.
Keywords：bolting supportpullout testaxial forcebonding shear stress
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 344-348 )