摘要
Abstract
In order to solve the problem of large deformation and difficult control in deep broken surrounding rock roadway,the rail crossheading connection roadway of the 43lower02 fully mechanized mining face in Dongtan Coal Mine of Yankuang Energy Co.,Ltd.is taken as the research background.Through monitoring the deformation of surrounding rock,drilling hole peeping,and mineral composition analysis,the causes of roadway surrounding rock damage are revealed.A combined support technology scheme of"grouting short anchor cable+prestressed long anchor cable+metal mesh+sprayed concrete"is proposed,and the reliability of this support scheme is verified through numerical simulation calculation.The on-site practice results show that after adopting this support scheme,the maximum displacement amount of the roof and floor of the roadway is 113.9 mm,the maximum convergence amount of the two sides is 92.2 mm,the maximum heaving floor amount is 56.7 mm,and the rock stratum layer separation amount within the range of 1-7 m of the roadway roof is within 13.2 mm,effectively controlling the stability of the roadway surrounding rock and ensuring the stability of the roadway.关键词
高应力/破碎围岩/变形破坏/预应力长锚索/注浆短锚索Key words
high stress/broken surrounding rock/deformation and failure/prestressed long anchor cable/grouting short anchor cable分类
矿业与冶金
