Department of Mining and Design,Tiandi Science and Technology Company Limited Mining and Design Branch,China Coal Research Institute

针对煤矿松软破碎软岩巷道采用锚杆支护时锚固力普遍偏低、达不到设计要求的问题,开发了煤矿软岩钻孔顶部扩孔钻头,并分别在实验室和煤矿井下现场进行了扩孔效果和扩孔锚固性能对比试验。试验结果表明:新研制的扩孔钻头在扩孔段扩孔直径比普通钻孔直径大5.3 mm左右,煤矿井下100 mm短锚固拉拔对比试验时,扩孔钻孔锚杆最大锚固力达112.3 k N,为普通钻孔锚固力的1.55倍。并且在树脂锚固剂和钻孔煤岩壁之间发生脱锚后,良好的机械摩擦阻力使锚杆锚固力一直保持基本不变,充分反映了软岩扩孔锚固的良好效果。

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.

国家自然科学基金煤炭联合基金资助项目(U1261211)；“十二五”国家科技支撑计划资助项目(2012BAB13B02)；中国煤炭科工集团科技创新基金面上资助项目(2013MS010)；