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过去我们用断裂力学理论分析了锚喷支护原理(详见本刊1982年第2期《用断裂力学理论探讨锚喷支护原理》),提出巷道围岩变形破坏的过程可分为三个阶段,即:固有裂纹的活化与稳定扩展;裂纹的分叉与交接;裂纹的急速扩展、多组裂纹互相贯通形成危岩掉落。为了定量分析这个问题,我们对岩石破坏的断裂韧性和裂纹扩展速率做了试验。
In the past, we used the theory of fracture mechanics to analyze the principle of anchor and shotcrete support (for details, see our issue No. 2 of 1982, “Studying the principle of anchor and shotcrete with fracture mechanics”), the process of deformation and failure of surrounding rock in a tunnel can be divided into three Stage, that is: the activation and stability of the inherent expansion of the crack; crack bifurcation and handover; rapid expansion of cracks, cracks interpenetrating groups of formation of dangerous rock fall. In order to quantitatively analyze this problem, we tested the fracture toughness and crack growth rate of rock failure.