Size of coal mining face in coal mine

The overall planning coal mining face scale is 90, 120, 150,180,200,240,300, etc. According to relevant information, there is no provision in the national security regulations. Generally, the fully mechanized working face planning is 90, 120, 150,180,200,240,300, etc. The longer the working face, the lower the tunneling rate, but the longer the working face, the greater the investment and the greater the ground pressure, which makes the working face difficult to manage. Small and medium-sized coal mines are generally 90- 150m, and large coal mines are generally 200-300m. In addition, the length of the working face should be considered according to the geological conditions, advancement, investment budget, ignition period and equipment overhaul period of the mine.