With the continuous advance of the mining face with mine roof support, the area of stope roof control gradually increases. When the direct roof with a small thickness gradually collapses, while the hard old roof with a large area of overhang, a natural pressure arch is formed in the roof rock of the working face, and the coal wall compression changes, resulting in the pressure concentration of the working face.
1. The supporting method of mine roof support must be compatible with the rock properties of roof.
2. After mining, the coal mining machine with roof support should support timely.
3. Necessary safety measures shall be taken for the overall displacement conveyor of roof support in mines.
4. The upper and lower exits of the working face should have special supports. According to "coal mine safety regulations", generally adopt in the upper and lower roadway in advance of the working face to lift the shed, in the head, the tail of the frame to lift the shed, sometimes to add a dense pillar or wood stack and other measures to support.
5. Prevent shelling from collapsing the shed.
6. The roof support of the mine shall be carefully done with the lifting column and jacking. Back column top must be timely, when the control distance exceeds the operating regulations, mining is prohibited. The roof still does not fall after the return column, and when the suspension distance exceeds the prescribed suspension distance, manual toppling or other effective measures must be taken to force the toppling.
7. Stick to a regular cycle.
8. The necessary system of mine roof support shall be adhered to. For example, the system of asking for help, the system of acceptance support, the system of post responsibility, the system of metal support inspection, the system of shift, the system of roof analysis, etc.
