砂土的双硬化特性与弹塑性本构模型

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摘要基于高精度的丰浦砂三轴等向加卸载试验与多应力路径平面应变压缩试验结果，提出平面应变条件下的修正塑性功体积硬化函数，得到双硬化框架下的修正塑性功剪切硬化函数，建立应力路径不相关的丰浦砂修正塑性功剪切–体积双硬化函数。在该双硬化函数基础上，推导基于修正塑性功的增量型剪切–体积双硬化弹塑性刚度矩阵，构建可以考虑多种变形强度影响因素的丰浦砂本构模型。数值计算与室内试验结果的比较表明，该砂土双硬化弹塑性本构模型可以合理地模拟砂土材料的变形强度特性。

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关键词 ：土力学, 砂土, 平面应变, 应力路径, 修正塑性功, 剪切&ndash, 体积双硬化函数, 弹塑性模型

Abstract：Based on the experimental results obtained from a series of high precision triaxial isotropic loading and unloading tests and plane strain compression tests along different stress paths on Toyoura sand，a modified plastic work volumetric hardening function is proposed under plane strain conditions. The modified plastic work shear hardening function is presented within the framework of double hardening. The modified plastic work shear-volumetric double hardening function is established，which is independent of stress path for Toyoura sand. On the basis of proposed modified plastic work double hardening function，an incremental type shear-volumetric double hardening elastoplastic stiffness matrix is deduced；then the constitutive model considering multiple influential factors on deformation and strength is established for Toyoura sand. The comparisons between the numerical and the experimental results show that the proposed double hardening constitutive model can reasonably simulate the deformation and strength characteristics of sand.

Key words： soil mechanics sand plane strain stress path modified plastic work shear-volumetric double hardening function elastoplastic model

收稿日期: 2010-09-07

引用本文:

彭芳乐1，2，雷亮1，白小宇1，3. 砂土的双硬化特性与弹塑性本构模型[J]. 岩石力学与工程学报, 2011, 30(2): 373-381.
PENG Fangle1，2，LEI Liang 1，BAI Xiaoyu1，3. DOUBLE HARDENING CHARACTERISTICS OF SAND AND ITS ELASTOPLASTIC CONSTITUTIVE MODEL. , 2011, 30(2): 373-381.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I2/373

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