基于微观孔隙结构的陷落柱突水危险性评价

Evaluation on Water Bursting Risk of Collapse Column Based on Microscopic Pore Structures

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。

For the study whether collapse column can conduct strong karst aquifer and lead to water inrush in coal floor or not,from the point of view of microscopic petrology, taking the collapse column in Taiyuan Gujiao Zhenchengdi Coal Mine as an example, mercury injection test and scanning electron microscopy（sem） are used to study collapse column fillings dissolution and pore structures. Results show that the porosity of rock sample fillings inside the collapse column is 0.640% to 3.830%, and the average pore diameter is 1.620 8 to 21.671 6 um, which is given priority to microporous and superfine hole. Collapse column are filled with a large number of calcite vein, and calcite crystal individual has corrosion phenomenon, corrosion is mild, the diameter of soluble denudation pores is far less than 10 um, the slightly soluble denudation holes in the current does not have hydraulic conductivity under the stress.