Research on axial force transmission law of anchor rod anchorage section

Aiming at the problems of the influence of different factors on the distribution interval of axial force in the anchorage section of prestressed bolt, a series of studies are carried out by using the comprehensive research methods of theoretical analysis, numerical simulation, laboratory test and underground measurement.The influence degree of anchoring length and pretightening force on anchoring section is obtained through stress tests of anchoring section with different anchoring length and preloading force.The pullout force and the preload force under different anchoring lengths and different preload torques of coal and rock are measured by the anchoring test in Renjiazhuang coal mine.Finally, some suggestions are put forward to enhance the anchoring performance and anchoring force.