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本文首先讨论了应力路径对砂土的应力—应变关系的影响。文中推导出了等应力比和变应力比加荷路径中的应力—应变曲线之间的关系,得出了在变应力比加荷路径下、考虑应力路径影响的非线性弹性模型的计算方法。还初步探讨了应力路径对粒状材料的应力—应变关系影响的机理。最后,用有限元法对土坝进行了计算,与目前工程上常用的、不计应力路径影响的Duncan Chang模型进行了对比。
This article first discusses the effect of stress paths on the stress-strain relationship of sand. In this paper, the relationship between the stress-strain curve and the equal stress ratio and the stress-stress ratio loading path is deduced, and the calculation method of the nonlinear elastic model considering the influence of the stress path under the variable stress ratio loading path is obtained. The mechanism of the effect of the stress path on the stress-strain relationship of the granular material is also preliminarily discussed. Finally, the finite element method was used to calculate the earth dam, and compared with the Duncan Chang model, which is commonly used in the current project and excluding the influence of the stress path.