对褶皱单元的处理，提出了平均主应力褶皱判断准则。
An average stress judge rule was developed to handle wrinkling elements.
含水率与初始平均主应力对预剪应力作用下原状黄土的初始动剪切模量具有显著的影响；
Water content wand initial average principal stress pm0 have significant influences on the initial dynamic shear modulus of undisturbed loess under the condition of pre-shearing stresses.
存在预剪应力作用时，含水率与初始平均主应力对原状黄土动剪切模量的影响程度降低；
The degrees of effects of water content wand initial average principal stress pm0 on the dynamic shear modulus of undisturbed loess reduce under the condition of pre-shearing stresses.
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