考虑三轴应力影响的岩石化学损伤蠕变模型
A Chemical Damage Creep Model of Rock Considering the Influence of Triaxial Stress.
作者信息
Chen Youliang, Chen Qijian, Pan Yungui, Xiao Peng, Du Xi, Wang Suran, Zhang Ning, Wu Xiaojian
机构信息
Department of Civil Engineering, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China.
Department of Engineering Geology and Hydrogeology, RWTH Aachen University, 52064 Aachen, Germany.
出版信息
Materials (Basel). 2022 Oct 28;15(21):7590. doi: 10.3390/ma15217590.
In order to accurately describe the characteristics of each stage of rock creep behavior under the combined action of acid environment and true triaxial stress, based on damage mechanics, chemical damage is connected with elastic modulus; thus, the damage relations considering creep stress damage and chemical damage are obtained. The elastic body, nonlinear Kelvin body, linear Kelvin body, and viscoelastic-plastic body (Mogi-Coulomb) are connected in series, and the actual situation under the action of true triaxial stress is considered at the same time. Therefore, a damage creep constitutive model considering the coupling of rock acid corrosion and true triaxial stress is established. The parameters of the deduced model are identified and verified with the existing experimental research results. The yield surface equation of rock under true triaxial stress is obtained by data fitting, and the influence of intermediate principal stress on the creep model is discussed. The derived constitutive model can accurately describe the characteristics of each stage of true triaxial creep behavior of rock under acid environment.
为了准确描述酸性环境与真三轴应力共同作用下岩石蠕变行为各阶段的特征，基于损伤力学，将化学损伤与弹性模量相联系，从而得到考虑蠕变应力损伤和化学损伤的损伤关系。将弹性体、非线性开尔文体、线性开尔文体和粘弹塑性体（莫吉-库仑体）串联，并同时考虑真三轴应力作用下的实际情况。因此，建立了考虑岩石酸腐蚀与真三轴应力耦合的损伤蠕变本构模型。利用现有的实验研究结果对推导模型的参数进行了识别和验证。通过数据拟合得到了岩石在真三轴应力下的屈服面方程，并讨论了中间主应力对蠕变模型的影响。所推导的本构模型能够准确描述酸性环境下岩石真三轴蠕变行为各阶段的特征。
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