What are the main features of underground mining of coal that? A: The mining of underground coal mines must digging a series of wells from the ground to the ground. The production process is underground, and the natural conditions are more complicated. The main features of mining are the need for mine ventilation, gas, coal dust, roof, fire, water. Five major disasters. (1) Mine ventilation. Because the production of underground coal mines is underground, the ground air will be mixed with harmful gases and dust during the process of entering the underground and flowing through the various workplaces, and the composition will gradually change. At the same time, due to geothermal effects, human body and mechanical heat dissipation, evaporation of water, etc., the temperature and humidity of the downhole air will increase significantly, resulting in poor climatic conditions, therefore, the mine should be ventilated. (2) Gas and mine dust disasters. In the process of mining coal, gas and dust are generated. Gas and coal dust will explode under certain conditions, causing casualties and property losses; mine dust can also cause miners to suffer from coal and silicosis, causing pain to miners. (3) Roof disaster. During the underground mining process, the roof will fall due to the pressure of the mine. If there is a loophole in the management of the roof, a roof accident will occur. (4) Mine fires. Mine fire is also one of the major disasters in coal mine production. Once a mine fire occurs, it will not only cause loss of coal resources, but also disrupt the layout of various work, and often cause gas and coal dust explosions, and expand the degree and scope of disasters. (5) Mine floods. During the construction and production of the mine, surface water and groundwater will flow into the mine through various channels. In order to ensure the normal construction and production of the mine, various measures must be taken to prevent water from entering the mine or discharging the water entering the mine to the ground, but when the mine water overflows beyond the normal drainage capacity, or excavate the old pond water or karst water during the mining work When the groundwater body is used, it will cause water damage. Chery Used Car, Mid Size Chery Used Car, Chery Used SUV Chongqing Yuntu Automobile Trading Co., Ltd. , https://www.yuntuauto.com