随着离开震源距离的增加，压力减小，但仍超过岩石的弹性限度，使周围岩石形成放射状和环状的裂隙带，叫“塑性带”。
采用正交有限元方法来考察不同参数、不同水平的变化对塑性带厚度的影响。
The paper highlights the application of the orthogonal finite element method to explore the impact of variable levels and the different parameters on the thickness of the plastic zone.
实验还观察到随着塑性变形量的增加，变形带的倾斜方向会发生对称迁移现象。
And with the increase of the plastic deformation, the inclined direction of the deformation bands takes place a symmetry change.
在塑性区内存在高位错密度的主位错带。
A main dislocation band with high dislocation density in the plastic zone was found.
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