土的平面应变是岩土工程中常见的状态，其中零应变方向的主应力是十分复杂的。
Plane strain state is familiar in geotechnical engineering, and estimating the principal stress in the plane strain state is very complicated.
目前在相似材料模拟试验中，常采用平面应力模型与平面应变模型两种受力状态。
At present, two stress states — the planar stress and the planar strain are usually adopted in the modeling experiment of the equivalent materials.
并发现在平面应力状态下，梁的梯度效应略强于平面应变状态。
Results also show that the scale effect in plane stress state is slightly stronger than that in plane strain state.
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