The development mode of the mine is

The development mode of the mine is the comprehensive development of inclined shaft and vertical shaft. The main roadway is arranged horizontally, and the strip mining working face is arranged along the main roadway. The mining method is the long wall retreating one-time full height comprehensive mechanized mining method, and the full caving method is used to manage the roof. The driving working face adopts the driving technology of continuous coal mining machine and bolt machine to support the roof. Shendong geological survey company has constructed the observation hole project (hole Mao 1) in the crack zone 10 m west of the cut hole area of 31104 working face. Through the construction of Mao1 drilling hole, the description of RQD value of core, lithology identification and observation of flushing fluid, it is concluded that the depth of Mao1 drilling hole is 0-64.28m as the whole bending zone, 64.28-96.78m as the water conducting fracture zone, and 96.78-110m as the caving zone. The height of the overall bending zone is not less than 110m, the height of the water diversion fracture zone is not less than 45.72m, and the height of the caving zone is 13.22m.