基于修正Davidenkov本构模型与Byrne孔压增量模型的有效应力算法及其验证

发布时间：2018-01-04 10:59

本文关键词：基于修正Davidenkov本构模型与Byrne孔压增量模型的有效应力算法及其验证　出处：《应用基础与工程科学学报》2017年05期 　论文类型：期刊论文

【摘要】：提出了Davidenkov本构模型的不规则加卸载修正准则,以代替扩展Masing法则中的"上大圈"准则,并通过南京细砂原状土样的共振柱试验,提出了考虑初始有效围压对初始剪切模量和参考剪应变的修正公式.利用ABAQUS显式开发模块,实现了基于不规则加卸载准则的修正Davidenkov本构模型与Byrne孔压增量模型的有效应力算法.对饱和南京细砂进行排水循环三轴试验,给出了南京细砂的Byrne孔压增量模型参数;对饱和南京细砂进行了不排水循环三轴试验和三维数值仿真的比较研究,发现该子程序能够较好地模拟南京细砂的振动孔压发展过程,合理地反映土体的液化特性,从而验证了本文提出的有效应力算法的合理性.
[Abstract]:The irregular loading and unloading correction criterion of Davidenkov constitutive model is proposed to replace the "upper large circle" criterion of extended Masing rule, and the resonance column test of Nanjing fine sand undisturbed soil sample is carried out. A modified formula considering the initial effective confining pressure for the initial shear modulus and the reference shear strain is proposed. The module is developed explicitly by using ABAQUS. The effective stress algorithm of modified Davidenkov constitutive model and Byrne pore pressure increment model based on irregular loading and unloading criterion is realized. The parameters of Byrne pore pressure increment model of Nanjing fine sand are given. The undrained cyclic triaxial test and three-dimensional numerical simulation of saturated Nanjing fine sand are carried out. It is found that the subprogram can simulate the development process of vibrating pore pressure of Nanjing fine sand. The liquefaction property of soil is reflected reasonably, which verifies the rationality of the effective stress algorithm proposed in this paper.
【作者单位】：南京工业大学岩土工程研究所;江苏省土木工程防震技术研究中心;
【基金】：国家自然科学基金项目(51378258;51438004) 国家科技重大专项(2013ZX06002001-9)
【分类号】：TU435
【正文快照】： 210009)大量的地震灾害都出现液化现象,分析其根本原因是场地中可液化土层在地震作用下振动孔隙水压力增长引起的.近几年,随着计算机技术和商业软件的发展,许多学者希望利用数值模拟的方法来研究实际地震过程中振动孔压的发展及其液化特性,其首要解决的问题是找到合理的土体动

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