Prediction and water inrush omen of the hottest mi

The prediction of mine flood and water inrush omen

the prediction of mine flood refers to the determination of the risk degree of mine flood and the preparation of mine flood prediction map according to the hydrogeological data of geological exploration and the special flood investigation data before mining

(1) determination of the dangerous degree of mine flooding

① use the water inrush coefficient to determine the dangerous degree of mine flooding. The water inrush coefficient is the ratio of the hydrostatic pressure (kPa) in the aquifer to the thickness of the aquifer (m), and its physical meaning is the ultimate water pressure that can be borne by the unit thickness of the aquifer

② determine the dangerous degree of mine water disaster according to the influencing factors of hydrogeology. According to the complexity of hydrogeology, this method divides the water hazard degree of the mining area into five grades

(2) preparation of mine flood prediction map. According to the thickness of the water resisting layer and the water pressure value of each section of the mining area, calculate the water inrush coefficient of a certain mining level, prepare a simple water inrush prediction map with corresponding proportion, and then delineate the safety zone and dangerous zone according to the critical value of the water inrush coefficient of the mining area. Another compilation method of flood prediction map is to delineate the grade area of underground flood on the mining plan, formulate the best mine planning and measures to prevent and control flood, strengthen the monitoring of dangerous areas, and ensure safe production

2. Omen of mine water inrush

the process of mine water inrush mainly depends on mine hydrogeology and mining site conditions. Generally, water inrush accidents can be summarized into two situations: one is that the amount of water inrush is less than the maximum drainage capacity of the mine, and the groundwater forms a stable depression funnel, forcing the mine to drain a large amount for a long time; The other is that the water inrush exceeds the maximum drainage capacity of the mine, resulting in the flooding of the whole mine or local mining areas. Before all kinds of water inrush accidents, there are usually many kinds of water inrush omens

it can also not be corroded by external gas

(1) general omen:

① the coal seam becomes moist and soft; Dripping and drenching appear on the coal slope, and the drenching changes from small to large; Sometimes rust colored water stains appear on the coal slope

② the temperature of the working face decreases, or there is fog or hydrogen sulfide smell

③ sometimes you can smell the hissing sound of water

④ the ground pressure increases, causing sidewall caving and floor heave

(2) omen of water inrush from the limestone aquifer on the floor of the working face:

① the pressure on the working face increases, the floor bulges, and sometimes the floor bulges. Ganfeng Circulation Technology Co., Ltd. achieved a profit of 10million yuan in 2016, up to more than 5oomm

② cracks occur in the floor of the working face and gradually increase

③ water seeps outward along the crack or coal slope, and the water volume increases with the increase of the crack. When the floor seepage increases to a certain extent, the coal slope seepage may stop, at this time, the water color is sometimes clear and turbid, and the water becomes turbid when the floor is active; The water color becomes clear when the bottom plate is stable

④ the bottom plate is broken, and high-pressure water is ejected along the crack, accompanied by hiss or harsh water sound

⑤ the bottom plate explodes with a loud noise, and a large amount of groundwater gushes out, and the water color is milky white or yellow

(3) omen of water inrush in loose pore aquifer:

① the water inrush part is damp, dripping and dripping phenomenon gradually increases. Careful observation shows that there is a small amount of fine sand in the water

② local roof fall occurs, the water volume increases abruptly and quicksand occurs. Quicksand is often intermittent, and the water color is clear and mixed from time to time. The general trend is that the water volume and sand volume increase until a large amount of quicksand gushes out

③ water and sand bursting occurs in the roof, which may affect the surface and cause collapse pits on the surface

the above omens are typical situations, which may not be all shown in the process of specific water inrush accidents, so they should be carefully observed, carefully analyzed and judged