Influence of Draining Depressurization on Ordovician Carbonatite Aquifer

For studying the influence of long time drainage effect of draining depressurization holes on carbonatite aquifer, taking the main inclined shaft of Malan Coal Mine in Taiyuan Gujiao Mining Area as the research object to study Ordovician carbonatite aquifer, we comparatively analyze the hydrogeological conditions of aquifer exposed by two times of constructing drainage hole at the bottom of main inclined shaft. The results showed that the water exchange of groundwater nearby drainage hole is accelerated, which increases solution rate of carbonatite; groundwater is constantly dissolved eroded along the circumferential cracks of boreholes and joint developed zone to form water storage space, which causes the uplift of aquifer; local water level is higher than the original. The uplift of water level in naked hole section of drainage hole makes the original relatively rich water-bearing stratum change water properties.