Experimental research of anchors bonding mechanical properties under transverse harmonic loads

There is an urgent need to study the micro mechanical properties and the adhesion variation of bolt under dynamic load as a consequence of the effect of mining load and blasting load on the existing bolt supporting. Based on engineering practice,the axial force variation under working conditions and the vibration information of surrounding rock around anchor bolt under the load of blasting vibration were monitored. Formula was obtained through indoor test for calculating the attenuation law of anchor bond in anchor rod under the coupled action of the working age and the vibration strength with lateral vibration inherent frequency under axial loads. In addition,a device was developed for conducting anchors grouted bolt model experiment under transverse harmonic loads. Using the uniform design method, considering two influencing factors including bolt length and bolt diameter,through dynamic monitoring system,the bolt transverse harmonic load stress distribution along the length of anchor bolt,the relationship between stress distribution and drawing force,and the relationship between shear stress and displacement were obtained. Finally,using software FLAC3D ,the mechanical model of bolt and rock interaction was established.