复用沿空留巷破碎围岩注浆加固机理研究

Grouting Reinforcement Mechanism of Fracture Surrounding Rocks in Reusable Gob-side Entry Retaining

基于巷内收敛及钻孔窥视等现场实测分析巷道围岩裂隙发育程度并进行裂隙分区的划分,以此分析留巷围岩变形机理及研究注浆加固破碎岩体自承能力的恢复程度。在此基础上提出前进诱导注浆方法,即对围岩浅部大裂隙进行浅孔注浆以形成注浆帷幕,之后以布置深部注浆孔改变围岩应力场的方式,引导深部饱和浆液向浅部未注满区域流动形成补强区域。

Based on the field measurement of displacement variation in roadway and borehole peering, the surrounding rock fracture development were analyzed, obtaining the zoning of fracture surrounding rock and recovering degree of bearing capacity for breaking rocks by using physical experiments. On the basis of these studies ,proposed forward induction grouting method which consists of shallow and deep hole grouting. Grouting curtain would be formed with the help of shallow hole grouting, the stress field changeable of surrounding rock after arranging deep grouting hole induced overflow slurry flowing from deep to shallow to develop a grouting development area. Finally, this grouting method was applied to engineering practice and achieved a good result.