剪胀性是砂土本构模型一个关键问题。

Dilatancy is the key issue to describe the constitutive behaviors of sand.

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最后，案例研究表明，本构模型是合理的。

Finally, the case study indicates that the constitutive model is reasonable.

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最后，案例研究表明，本构模型是合理的。

Finally, the case study indicates that the constitutive model is reasonable.

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