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为研究陷落柱能否导通煤层底板岩溶强含水层发生突水,从微观岩石学角度,以太原古交镇城底矿陷落柱为例,采用压汞试验和扫描电镜等手段对陷落柱充填物孔隙结构和溶蚀情况等进行研究,结果表明陷落柱柱体内充填物岩样孔隙度0.640%~3.830%,平均孔隙直径1.620 8~21.6716μm,其中多以微孔和超微孔为主。陷落柱中有大量的裂隙被方解石脉充填,方解石晶体个别有溶蚀现象,溶蚀较轻微,溶孔溶隙直径大都远小于10μm,这些微溶孔溶隙在目前的地应力下不具有导水性。
In order to study whether the collapse column can lead to the water inrush in the karst aquifer of the seam floor, taking the collapse column of Gujiao Town in Taiyuan as an example, from the microcosmic petrologic perspective, the plunge column was filled by means of mercury intrusion test and scanning electron microscope The results show that the porosity and pore volume of the filled column are 0.640% -3.830%, and the average pore diameter is 1.620 8 ~ 21.6716μm. Most of them are mainly micropores and micropores. There are a large number of fissures in the sinking column filled by calcite veins. Calcite crystals are slightly corroded and slightly dissolved. Most of the dissolved pore diameters are much smaller than 10 μm. These slightly dissolved pore voids do not have water conductivity under the current in-situ stress.