Numerical Experimental Study on Dynamic Pullout Performances of Grouted Rockbolt Structures with Bond Defects
To explore the influence of grouted defects on the bond-slip performance of grouted rockbolt structures under dynamic loads,analyze the bonding performance and damage mechanism of the grouted interface and clarify the influence of loading rate and bond defect length on the stress of rockbolt,the dynamic numerical experimental research on grouted rockbolt structures containing grouted defects was conducted in this paper.The results show that the bonding strength of grouted rockbolt structure increases with the increase of loading rate and decreases with the increase of grouted defect length;When the loading rate is 5000 mm/s,the dynamic strength increase factor of the grouted rockbolt structure is 3.01,which has a significant load-ing rate effect.During the pull-out process of rockbolt,as the length of the grouted defect increases,the peak load of the grouted rockbolt structure shows a decreasing trend,while the interface shear force shows an increasing trend.At different loading rates,as the length of the grouted defect increases,the peak load displacement of the grouted rockbolt structure gradually de-creases,the bonding strength of the grouted interface also gradually decreases,and the failure area of the grouted interface in-creases.
bond defectgrouted rockbolt structuresdynamic pulloutnumerical simulation
万方数据
维普
