基于状态相关本构模型的松砂静态液化失稳数值分析

发布时间：2018-04-11 15:55

本文选题：土力学 + 有限元　；参考：《岩石力学与工程学报》2014年07期

【摘要】：采用有限元数值方法分析饱和砂土稳定性时,需结合能够正确反映体变特性的弹塑性本构模型来模拟可能出现的静态液化现象。推导出状态相关砂土本构模型的隐式积分计算方法,指出计算过程中可能出现的两类数值错误,并给出相应的数值处理方法。以二阶功为负作为液化判别准则,分析并对比不排水条件下松砂平面应变试件在快速加载和慢速加载2种情况下静态液化现象与规律的不同。以整体二阶功为负作为松砂边坡稳定的判别条件,对海底人工堆积松砂边坡进行稳定性分析。算例分析结果表明,该判别条件具有一定的合理性且该数值计算方法是可靠的。
[Abstract]:When using finite element method to analyze the stability of saturated sand it is necessary to simulate the possible static liquefaction phenomenon by combining the elastoplastic constitutive model which can correctly reflect the volumetric variation characteristics.The implicit integral calculation method for the state dependent sand constitutive model is derived. Two kinds of numerical errors that may occur in the calculation process are pointed out and the corresponding numerical treatment methods are given.Taking the second order work negative as the criterion of liquefaction, the difference between the static liquefaction phenomenon and the law of the loose sand plane strain specimen under the condition of fast loading and slow loading is analyzed and compared.Taking the whole second order work negative as the criterion condition for the stability of loose sand slope, the stability analysis of artificial accumulated loose sand slope is carried out.The numerical results show that the criterion is reasonable and the numerical method is reliable.
【作者单位】：同济大学岩土及地下工程教育部重点实验室;同济大学地下建筑与工程系;
【基金】：国家重点基础研究发展计划(973)项目(2012CB719803) 国家自然科学基金资助项目(11372228)
【分类号】：TU43

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