论文部分内容阅读
采用非线性弹塑黏性有限元法模拟了砂土地基变速率加载室内试验,再现了砂土地基荷载-沉降曲线对加载速率突变、砂土蠕变以及应力松弛等加载情况下的响应和瞬时黏性中砂土黏性随加载进行的衰减现象。在有限元分析中,以非线性三要素模型为理论框架构建了可以综合考虑砂土黏性特性的弹塑黏性本构模型,用动态松弛法进行有限元求解,最后通过有限元与室内试验的对比分析研究了砂土地基所具有的黏性特性,同时验证了非线性三要素弹塑黏性模型用于模拟砂土黏性特征的合理性和正确性。
Nonlinear elastic-plastic viscoelastic finite element method was used to simulate the variable rate loading experiment of sandy soil foundation. The response and instantaneous moment of load-settlement curve of sand foundation to loading conditions such as sudden change of loading rate, creep of sand and stress relaxation Viscous sand soil viscosity with the attenuation of the phenomenon of loading. In the finite element analysis, based on the non-linear three-element model, an elastic-plastic viscous constitutive model can be constructed which can comprehensively consider the viscous behavior of sand and soil. The dynamic relaxation method is used to solve the finite element problem. Finally, The viscoelastic properties of sandy soil are studied. The feasibility and correctness of the nonlinear three-component elasto-viscous model to simulate the viscous characteristics of sandy soil are verified.