失稳就是稳定性失效，也就是受力构件丧失保持稳定平衡的能力，比如指结构或构件长细比（如构件长度和截面边长之比）过大而在不大的作用力下突然发生作用力平面外的极大变形而不能保持平衡的现象。
The major works and results of this dissertation were as follows:(1) The shape of sliding block and upside of sliding block were presumed as a trapezoid wedge and a trapezoid prism respectively when the tunnel face was collapse.
主要工作和研究成果如下: (1)假定开挖面失稳时滑动块的形状为一个梯形楔体,滑动块上部为一梯形棱柱。
参考来源 - 顶管工程土与结构的性状及理论研究1 ×10-5～2. 8 ×10-4m/s, the growth speed after destabilization is 5 ×101 ￣ 1.
试验结果给出了大理岩稳态扩展速度为1．1×10-5～2．8×10-4m／s，失稳后的扩展速度为5×101～1．2×103m／s。
参考来源 - 岩石裂纹扩展速度的研究与地震过程初探The slope failure occurred frequently because of rainfall events in recent years.
近年来，由于降雨导致公路边坡失稳进而影响交通的情况越来越多。
参考来源 - 降雨条件下山区公路边坡稳定性分析及评价The flowing status of metal has been accurately analysed when nosing form, the forecast of losing stabilization has come true on the computer.
该方法能够准确地分析缩口成形时金属的流动情况,实现了在计算机上对缩口成形失稳的预测。
参考来源 - A3钢缩口成形过程的有限元模拟So this article puts forward transient stability dynamic scanning analyses as follows: dynamically regulating transient stability analysis boundary conditions, scanning the whole grid faults at the first calculation, pertinently analyzing destabilization, presenting adjusting strategy and system transient stability ability.
为此,文中提出暂态稳定动态扫描分析概念:动态调整暂态稳定分析边界条件,首次计算扫描全网故障,针对性分析失稳故障,提出调整策略,给出系统暂态稳定能力。
参考来源 - 暂态稳定计算现状及动态扫描分析的思考·2,447,543篇论文数据，部分数据来源于NoteExpress
腰椎节段性失稳是腰椎退变过程中一个暂时的阶段。
Lumbar segmental instability is a temporary phase in the degenerative process of the lumbar spine.
分析了电力系统在周期性负荷扰动下的振荡失稳问题。
The power system instability caused by oscillation under periodical load disturbance was analyzed.
当井壁岩石所受的应力超过其强度时就会发生井壁失稳。
If the stress that ACTS on shale around wellbore exceeds its intensity, borehole instability will happen.
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