摘要
Abstract
In view of the problems of surrounding rock fragmentation and poor stability during the excavation period of the 51513 return air crossheading in Hulonggou Mine,by analyzing the control mechanism of anchoring and grouting on the stability of surrounding rock.Based on the geological characteristics of the excavation working face and the basic characteristics of surrounding rock deformation,a joint support technology process of reserved deformation amount,anchor net spraying initial support,full section anchor cable secondary support,full section secondary grouting,floor anchor grouting,and full section high-pressure deep hole repetitive grouting is proposed,forming a stable dynamic coupling support structure of anchoring and grouting.The practice shows that this joint support process can effectively suppress the degree of surrounding rock deformation and improve the overall bearing capacity of the surrounding rock.During the excavation period of the 51513 return air crossheading,the maximum subsidence amount of the roof is 35 mm,the maximum floor heave amount is 29 mm,and the maximum movement of the two sides is 70 mm.There is no abscission layer in the anchoring area,achieving safe stoping of the working face.关键词
深部/巷道/锚固/支护Key words
deep/roadway/anchoring/support分类
矿业与冶金
