Abstract:

Since the 90's of the last century, Donghuantuo Coal Mine auxiliary shaft headframe has subsided more than 100mm. The subsidence has affectted the safe of the hoisting system. After two times of attempt to adjust, the problem remains.By analysis the data of deformation observation, situation of coal mining surrounding the industrial square, the changes of the underground water level, and the load of the auxiliary shaft headframe, the writer demonstrates the main reason of the subsidence is the land subsidence caused by the decline of the Quaternary Groundwater level year by year, which is caused by drainage of groundwater and the water pumping by wells in the Industrial square areas. At the end of this paper, the writer give a plan for prevention measures of the subsidence of Donghuantuo Coal Mine auxiliary shaft headframe.

Key words: headframe, subsidence, groundwater level, subsidence mechanism, Prevention and control measures