Coupled elastoplastic damage modeling of anisotropic rocks
Coupled elastoplastic damage modeling of anisotropic rocks
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DOI：
10.1016/j.compgeo.2009.09.001
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发表时间：
2010
影响因子：
5.3
通讯作者：
Liang Chen;J. Shao;H. Huang
中科院分区：
文献类型：
--
作者：
Liang Chen;J. Shao;H. Huang
提出了耦合弹塑性损伤模型来描述强各向异性沉积岩。为了描述材料固有的各向异性，利用织物张量的概念引入标量各向异性参数。使用该参数，考虑载荷方向的影响，制定各向异性塑性模型。然后，塑性变形与微裂纹生长引起的损伤相结合。所提出的模型适用于典型的沉积岩；图尔内迈尔页岩。给出了模型参数辨识的程序。对不同围压和不同加载方向下的三轴压缩试验进行了一系列数值模拟。数值预测与实验结果的比较表明，该模型能够再现强各向异性岩石力学行为的主要特征。
A coupled elastoplastic damage model is proposed for the description of strongly anisotropic sedimentary rocks. In order to describe the inherent anisotropy of the material, a scalar anisotropy parameter is introduced using the concept of fabric tensor. Using this parameter, an anisotropic plastic model is formulated taking into account influence of loading orientation. Plastic deformation is then coupled with induced damage by growth of microcracks. The proposed model is applied to typical sedimentary rock; Tournemire shale. The procedure for model’s parameters identification is presented. A series of numerical simulations are performed for triaxial compression tests performed with different confining pressures and various loading orientations. Comparisons between numerical predictions and experimental results show that the proposed model is capable to reproduce the main features of mechanical behavior of strongly anisotropic rocks.