平面应变问题是指具有很长的纵向轴的柱形物体，横截面大小和形状沿轴线长度不变；作用外力与纵向轴垂直，并且沿长度不变；柱体的两端受固定约束的弹性体。这种弹性体的位移将发生在横截面内，可以简化为二维问题。
新的结果还解释了平面应力和平面应变问题的区别。
The new result here explains the difference between the cases of plane strain and plane stress.
隧道支护结构应力分析习惯于采用平面应变问题来处理。
In the tunnel support construction stress analysis, it is conventional to use two dimensional strain principle.
维护边坡稳定的挡土墙设计，都是按弹性力学平面应变问题分析的。
The retaining wall for remaining stability of slope are all designed as plane strain problem in elastic theory.
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