Abstract:

     By comparing on changes of aeration zone structure before mining,during subsidencing,and stable phase,this paper studied the effect of coal mining subsidence on aeration zone structure in the Shenfu-Dongsheng mine. The research shows that the main lithologies of aeration zone in the Shenfu -Dongsheng mining area are aeolian sand and coarse sand of Salawusu Formation with relatively small thickness. The medium sequence is clear,and all the medium particles have orderly arrangement and homogeneous structure,and the aeration zone is mainly formed with pores. During the unstable phase after coal-mining, subsidence cracks run through the aquifer, resulting in massive groundwater leakage. Some fractures occur on the ground surface and cause the porosity changes, leading to the thickening of aeration zone structure of subsidence zone. In a certain depth,the structures are in homogeneous; in the shallow part aeration zone is mainly formed with fractures. Aeration zone structures become stable during stable phase and aeration zone of subsidence area becomes relatively thick.Below the ground surface there are still some intermittent cracks (gaps) which make subsidence zone form mainly with pores and intermittent cracks. 

Key words: aeration zone, coal mining and collapse period, Shenfu-Dongsheng mining area