软碎厚泥岩顶板巷道短锚索强力支护技术
Powerful Supporting Technology of Short Anchored Cable for Roadway with Soft, Cracked and Thick Mudstone Roof
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摘要: 针对平定裕泰煤业15101综放工作面回风巷道围岩大变形、反复破坏的控制难题,在总结类似矿区相关巷道支护经验基础上,分析得出回采巷道具有大埋深、大断面、强烈动压影响等特征,并结合现场地质生产条件,提出采用21.6mm,L=5.25m的高强度大直径高预应力短锚索进行顶板全锚索支护的控制方案,并在现场应用。实践表明:采用该支护方案后26d左右,回风巷道变形趋于平稳,顶板下沉量不超过176mm,底鼓量不超过110mm,左帮最大移近量87mm,右帮最大移近量为95mm,巷道围岩变形得到有效控制,且巷道服务期间未扩刷整修,技术经济效益显著,可为类似巷道围岩控制提供技术支撑。Abstract: In order to solve difficult problem of supporting large-deformation and repeatedly-broken air-return roadway of 15101 Mining Face in Pingding Yutai Coal Company,on the basis of summing up experience of roadway supporting,a supporting projection of whole short anchored cable with high strength,high pre-stress and large diameter was put forward.Practice showed that after applying this method 26 days later,deformation of air-return roadway came to stable.Roof subsidence value was not than 176mm,floor heave value was not than 110mm,left and right side’ s maximum deformation value were respectively 87mm and 95mm.Roadway deformation was controlled effectively.Good technical and economic profit was made.