Calculation and prediction of initial support pressure in bolt support
Abstract：In order to get and predict initial support pressure,mechanical models of bolt’s stress and bolt’s installation were established,based on the hypothesis on surrounding rock of immediate bolt support in elastic-plastic status.The relationship between initial support pressure and tightening torque was analyzed,and theoretical solutions to initial support pressure were obtained for two contacts of pallet and nut.Meanwhile,verification research was carried out by "Bolt Force Transfer and Attenuating Test System".The results show that there is a linear relationship between initial support pressure and tightening torque under the same condition of bolt’s material quality,specification,row line space;when the tightening torque is among 0-300 N.m,the equations of initial support pressure and tightening torque is right;initial support pressure can be quantized and predicted by tightening torque.
Keywords：bolt supportsupport pressurepre-tightening forcetightening torque
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( 1982-1986 )