Research on water and sand inrush mechnism and repairtechnology of shaft rupture in inclined shaft

In order to solve the technical problem of repairing the lining of inclined shaft in coal mine,this paper takes the project of controlling severe water and sand inrush disaster caused by the rupture of the auxiliary inclined shaft in Jinjitan Coal Mine of Shaanxi Province as an example.On the basis of fully analyzing the rupture mechanism of the inclined shaft and the source of water sand,the emergency measures of temporary raft support combined with the grouting treatment of the inclined shaft side were adopted; later,the U-shaped steel shed was used for permanent reinforcement,which goes with the curtain grouting treatment to form an overall repair measures.The repair results show that the rescue control measures effectively controll the water inflow and sand carrying capacity of the rock-shaft,slow down the deformation rate of the inclined roof and the bottom plate,and won time for the overall restoration in the later stage; the overall restoration measures reduce the water inflow from the rock-shaft from 72 m3/h to 3.8 m3/h,the sand holding capacity is below 0.1%,and the surface collapse pit no longer develop.After the completion of the rock-shaft repair,the remaining unfavorable geological situation did not occur,and the repair effect was good,which ensured the normal service of the rock-shaft and provided reference for the similar disaster management.