地应力是引起围岩变形和破坏的根本作用力。
The earth stress is an essential force causing rock deformation and breakage.
不同主应力方向的破坏强度最大差别可达30%。
The maximUm difference of failure strength among various principal stress direction is up to 30%.
而交变应力集中是疲劳破坏的一个关键因素。
The concentration of alternate stress is a key factor of fatigue destruction.
与此同时，应力和活性阴离子对氧化膜的破坏造成孔蚀；
At the same time, stress and active anion will destroy the oxidic film.
激化环境和存在三轴应力，常可加速这种破坏。
It is frequently accelerated by the presence of an active environment and by triaxial stress.
激化环境和存在三轴应力，常可加速这种破坏。
It is frequently accelerated by the presence of an active environment and by triaxial stress.
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