The rock damage model and the damage-coupling model suited to analyze the whole process of water jet breaking rock were established with continuum damage mechanics and micro damage mechanics.
运用连续损伤力学和细观损伤力学理论，建立了适用于水射流破岩全过程分析的岩石损伤模型以及宏细观损伤的耦合模式。
On the basis of summarizing testing effects, the extension of crack and the breaking mechanism of top coal caving in steep seam have been analyzed by applying fracture mechanics theory.
在总结现场试验效果的基础上，应用断裂力学理论分析了急倾斜煤层巷道放顶煤顶煤破断裂纹的扩展和破碎机理。
Macro check on the breaking section and mechanics calculation of the jib are performed. The force status and safety of the jib are also discussed.
经对断口的宏观分析、起重臂的力学计算，以及对起重臂的工作受力状态和安全性的讨论，最后判定断裂是由于主臂构造缺陷和疲劳所致。
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