神府—东胜矿区采煤塌陷对包气带结构的影响

通过对比采煤前和采煤塌陷过程中及稳定后包气带结构的变化,详细研究了神府—东胜矿区采煤塌陷对包气带结构的影响。研究结果表明:在采煤塌陷前,包气带组成岩性主要为风积砂岩和萨拉乌苏组粗砂岩,相对较薄,包气带组成介质层序较清晰,各岩性介质颗粒排列有序、均一,包气带内部结构以孔隙为主;在采煤发生后的塌陷非稳定阶段,塌陷裂隙贯通含水层,使地下水大量渗漏,同时产生大量贯穿地表的裂隙,引起岩土孔隙性发生变化,使得塌陷区包气带变厚,在一定深度上结构不均,浅部包气带结构转化为以裂隙为主;到塌陷稳定阶段,包气带结构变化趋于稳定,厚度增加,但在地表以下仍存在一些断续的裂缝(隙),使塌陷区包气带形成以孔隙为主,间夹断续裂隙的特殊包气带结构。

The Effect of Coal-mining Subsidence on Aeration Zone Structure in the Shenfu-Dongsheng Mining Area

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.