Study on anchoring mechanism and anchoring performances of bottom reaming for anchoring borehole in soft seam

Acording to the problem that a low anchoring force of the bolt applied to the soft seam gateway.which restricted thebolt support technology development of thesof seam gatewaythe anchor hole anchoring afiter invered wedgereaming at the bottom of the borehole was proided to improve the anchoring perormancesof the bot. The mechanics anal ys lab experinent stmlar simulation and underground site experiment were conducted with the selif-developed bottom single wing device of the anchoring borehol .The experimentresulshowed that the reversed wedge anchoring of the botom in the anchoring oreholeof sof seam could obviousliymprove the anchoring peromances of the bo . E specally theresidual anchoring fovce of the bot was increased by nearly one time afer the bot reached the max anchoring force,and could provide the technical support to wide application of the bolt support applied to the soft seam gateway.