Research and development on reamer bit of mine soft rock and experimental research on anchoring performance of reamed borehole

Accoding to the general low boft anchoring force and not met the designed requirement of the bolt anchoring force when the baolt support appied to themine soft and broken soft ock oadiway a top reaming headof the mine softrok borehole wa developed. The borehole reaning effct and the anchoring peromancecomparison test f the reaned boreholes were conducted in the lab and the underground mine site.The test resuts showed that a reaming diameter of a new researched and develped reaming head at the borehole reaning secion could be about 5. 3 m larer than the comvenional borehole diamer nth 10 m shor anchoingpulling comparison fests of the underground mine,the max anchoring force of thebaolt in the reamed borehole could be up to 112.3 k N and coud be 1.5 times igherthan the anchoring force of the conventional borehole.Meanwhile when the bonding falire ocured between the resin anchoring carridge and borehole cal and rockwall agood mechanical frctonal resistance could keep a basic unchanging of the bolt anchoring force and coul ful refect excellen ffect of the reamed borehole anchoring in soft rock.