During the mining process, coal or rock mass with a large amount of elastic energy accumulates under high stress conditions, and suddenly breaks, falls or throws under certain conditions, causing sudden release of energy, showing obvious sound, vibration and air waves. The dynamic effect. These phenomena are collectively referred to as dynamic pressure phenomena. It has the characteristics of sudden explosion, and its effect is like a large number of explosives blasting, and some can form a strong storm, the degree of damage is more serious than the general mine pressure, and it is easy to cause serious natural disasters in underground mining.
First, the impact of mine pressure phenomenon
The impact rock pressure is the sudden release of energy accumulated in the mine roadway and the coal and rock mass around the stope. An explosive accident occurs in the mine shaft. The power throws the coal rock into the roadway, and at the same time emits a strong sound, causing the vibration of the coal body and the coal and rock mass. Damage, damage to the brackets and equipment, casualties, and damage to some roadways. Impact rock pressure can also cause or may cause other mine disasters, especially gas, coal dust explosions, fires and floods, interfering with ventilation systems, causing ground vibrations and building damage in severe cases. Therefore, the impact of mine pressure is one of the major disasters in the coal mine.
Second, the characteristics of the impact of mine pressure
Sudden
2. Instantaneous vibration
3. Greatly destructive
4. Complexity
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