GROUTING INTO ABSCISSION LAYER TO REDUCE SUBSIDENCE OF SURFACE

Due to underground mining of coal,there occurs always subsidence of surface.The subsidence not only causes demage of buildings influencing negatively the normal production and living order but also creates a series of social troubles.To ensure safe underground mining of coal without losses resulted from surface subsidence,Tangshan Coal Mine of Kailuan Groups Inchas successfully adopted the technology of grouting into abscission layer and achieved good economic as well as social benefits.This technology is of great worth to be spreaded.