动力作用下砂土的残余体变及其时域连续模型
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摘要
通过对砂土动力剪切荷载作用过程中的土骨架的弹性和塑性分析,研究了土骨架接触面部分可能发生的弹性恢复和永久变形以及破碎引起的最剧烈的塑性变形;并且,提出了可以通过液化前后颗粒粒径的质量百分含量的对比试验,来验证破碎模型的合理性;为进行砂土动力非线性变形和液化的数值模拟,结合砂土的剪切非线性的本构,总结了更为简化的时域连续的函数经验公式,使得在时域内进行土壤动力特性和动力非线性反应分析,以及用剪胀性理论解释动力液化和变形问题易于进行。
In order to research the elastoplastic deformation of sand skeleton under dynamical shear loading some constitutive models are analyzed and built, including the model of the finally or the irreversible deformation in the touched part of particles which maybe crashed; and a method is designed to verify the above model through testing the percent change of masses of different sizes particles before and after sand liquefaction. In order to simulate the nonlinear dynamical volumetric deformation and constitutive relation of shear stress-shear strain during the liquefaction, a time-domain-discrete model of sand diliatancy is suggested; the simplified equation can easily to explain the liquefaction and easily to analyze the dynamical deformations of sand.
In order to research the elastoplastic deformation of sand skeleton under dynamical shear loading some constitutive models are analyzed and built, including the model of the finally or the irreversible deformation in the touched part of particles which maybe crashed; and a method is designed to verify the above model through testing the percent change of masses of different sizes particles before and after sand liquefaction. In order to simulate the nonlinear dynamical volumetric deformation and constitutive relation of shear stress-shear strain during the liquefaction, a time-domain-discrete model of sand diliatancy is suggested; the simplified equation can easily to explain the liquefaction and easily to analyze the dynamical deformations of sand.
引文
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[5]绍生俊,谢定义.土的变形非线性与剪缩剪胀性新认识[J].岩土工程学报,2000,22(1):1-5.
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