弹性力学变分原理的先决条件、补充条件和反映的规律一起正是弹性力学全部基本方程。
The preconditions, additional conditions and reflection laws of variational principle are the complete elementary equations in elasticity.
坝踵裂缝扩展是重力坝破坏的开始。应该用断裂力学方法校核坝踵裂缝的稳定性，并以此作为重力坝稳定的补充条件。
Stability of the crack should be checked by the method of fracture mechanics, which should be a supplemental stability condition of the gravity DAMS.
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