Engineering parameters of water injection to control mine shaft damage at Jisan coal mine

In order to apply water injection method to engineering practice,this paper studied the engineering parameters for the water injection method used to precipitation reduction control of shaft damages by using the GMS software and theoretical analysis,and analyzed the water injection hole structure,the positional relationship between water injection holes and shaft,the layout of a water injection hole and grouting curtain on water flooding effect.The results show that the size of water injection hole has little influence on the effect of injection.The proper distance between water injection hole and shaft is about 20~30 m.Drilling symmetrical arrangement is more favorable to the wellbore,prevention and control engineering when layout 4 basic symmetrical injection hole is more advantageous to guarantee the overall level of underground water near the well bore stability and balance.