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随着发生冲击地压现象的矿井逐渐增多,研究采场围岩系统的冲击与稳定条件是十分重要的。为此有人借鉴岩石在试验机冲击破坏的理论,提出了煤层在极限强度的刚度大于顶底板岩石的刚度,就易发生冲击地压,反之就处于稳定状态的稳定破坏条件。但是实际上并不完全是这样。有时虽然煤层在极限强度的刚度大于顶底板岩石的刚度,也不易发生冲击地压,反之,采掘工作系统也不稳定。这是因为这种冲击破坏条件是在试验机的抗压强度大于岩石试件的抗压强度之下建立起来的理论。
As the number of mines with the phenomenon of rock burst increases gradually, it is very important to study the impact and stability conditions of the surrounding rock system in the stope. For this reason, some people refer to the rock in the test machine impact damage theory, proposed that the stiffness of the ultimate strength of the coal seam is greater than the top and bottom rock stiffness, prone to impact pressure, on the contrary in a stable state of steady destruction conditions. But in fact it is not exactly the case. Sometimes, although the stiffness of the ultimate strength of the coal seam is greater than the stiffness of the top and bottom rock, it is not prone to rock burst, on the contrary, mining system is not stable. This is because this type of impact damage is based on the theory that the compressive strength of the test machine is greater than the compressive strength of the rock specimen.