Strength criterion and elastoplastic constitutive model of frozen silt in generalized plastic mechanics
Strength criterion and elastoplastic constitutive model of frozen silt in generalized plastic mechanics
复制标题
广义塑性力学中冻结粉土的强度准则和弹塑性本构模型
DOI：
10.1016/j.ijplas.2010.01.007
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发表时间：
2010-10-01
影响因子：
9.8
通讯作者：
Li Shuangyang
中科院分区：
文献类型：
--
作者：
Lai Yuanming;Yang Yugui;Li Shuangyang
在围压范围为0.0 ~ 14.0 MPa、温度范围为-2、-4和-6℃的条件下，对冻结粉土进行了三轴压缩试验，提出了基于试验结果的扩展Lade-Duncan强度函数在pi面f(pi)(0)和p-q面f(p-q)(p)相结合的强度准则。为了描述冻结粉土的变形特征，采用椭圆屈服面、非关联流动规律和两个抛物线屈服面，提出了一种广义塑性力学中的弹塑性本构模型来描述冻结粉土的非线性行为，如压力融化和破碎现象、应变软化/硬化特征和膨胀等。连同非关联流动规则的剪切机制。通过与三轴压缩试验结果的对比，验证了模型的有效性。结果表明，在低围压和高围压条件下，该模型预测的应力-应变曲线与相应的试验结果吻合较好。(C) 2010 Elsevier Ltd.版权所有。
Triaxial compressive tests of frozen silt were carried out under confining pressures from 0.0 to 14.0 MPa at the temperatures of -2, -4 and -6 degrees C. A strength criterion based upon experimental results is presented by the combination of extended Lade-Duncan strength function f(pi)(0) in pi-plane and f(p-q)(p) in p-q-plane. In order to describe the deformation characteristic of frozen silt, an elastoplastic constitutive model in generalized plastic mechanics has been proposed for the nonlinear behavior of frozen silt, such as the pressure melting and crushing phenomena, strain softening/hardening characteristics and dilatation, etc., by employing an elliptical yield surface, together with a non-associated flow rule for the compressive mechanism, and two parabolic yield surfaces, together with non-associated flow rules for the shear mechanism. The validity of the model is verified by comparing its modeling results with the results of triaxial compressive tests. It is found that the stress-strain curves predicted by this model agree well with the corresponding experimental results both under low and high confining pressures. (C) 2010 Elsevier Ltd. All rights reserved.