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A nonlinear elasto‐viscoplastic model for clayed rock and its application to stability analysis of nuclear waste repository
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2019-10-24 , DOI: 10.1002/ese3.515 Shanpo Jia 1, 2 , Caoxuan Wen 2 , Bisheng Wu 3
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2019-10-24 , DOI: 10.1002/ese3.515 Shanpo Jia 1, 2 , Caoxuan Wen 2 , Bisheng Wu 3
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The creep behavior is one of the most important topics on the stability analysis of rock mass in underground engineering. In order to characterize the creep deformation of clayey rock more accurately, this study proposes a nonlinear elasto‐viscoplastic (EVP) model based on a new yield surface and a modified Mohr‐Coulomb (MC) flow potential. First, the finite element (FE) formulation for the constitutive creep behavior is derived and a user subroutine to define the material's mechanical behavior (UMAT) is implemented in the commercial finite element package ABAQUS. The numerical simulation is validated against the triaxial creep tests of a cylinder, and the results show that the proposed model can effectively predict the creep responses of clayey rock and thus compensate for the deficiency of the creep model in ABAQUS. Then, the proposed model is used to study the long‐term stability of clayey rock formation surrounding an underground experimental site. Based on the results from triaxial creep tests and in situ monitoring of the lining deformation, the time‐dependent material creep parameters are obtained for rock by using the back analysis method. The predicted lining deformation is in good agreement with the field data with most of the relative errors less than 3.5%. The creep zone in the surrounding rock demonstrates that the horizontal scope is larger than the vertical one. The proposed model is proven to provide accurate prediction on the creep characteristics of clayey rock, showing a potential to assess the long‐term stability and reliability of large‐scale underground engineering structures.
中文翻译：
黏土非线性弹黏塑性模型及其在核废料库稳定性分析中的应用
蠕变行为是地下工程岩体稳定性分析中最重要的主题之一。为了更准确地表征黏土岩石的蠕变变形，本研究提出了基于新屈服面和修正的莫尔库仑（MC）流动势的非线性弹黏塑性（EVP）模型。首先，推导了本构蠕变行为的有限元（FE）公式，并在商用有限元软件包ABAQUS中实现了定义材料的机械行为（UMAT）的用户子例程。通过圆柱体三轴蠕变试验对数值模拟进行了验证，结果表明，该模型可以有效预测黏土的蠕变响应，从而弥补了ABAQUS蠕变模型的不足。然后，所提出的模型用于研究地下实验场地周围黏土岩层的长期稳定性。根据三轴蠕变试验的结果以及对衬砌变形的现场监测，使用反分析方法获得了岩石随时间变化的材料蠕变参数。预测的衬砌变形与现场数据非常吻合，大多数相对误差小于3.5％。围岩的蠕变区表明水平范围大于垂直范围。实践证明，所提出的模型可以对黏土岩石的蠕变特性提供准确的预测，显示出评估大型地下工程结构的长期稳定性和可靠性的潜力。
更新日期：2019-10-24
中文翻译：
黏土非线性弹黏塑性模型及其在核废料库稳定性分析中的应用
蠕变行为是地下工程岩体稳定性分析中最重要的主题之一。为了更准确地表征黏土岩石的蠕变变形，本研究提出了基于新屈服面和修正的莫尔库仑（MC）流动势的非线性弹黏塑性（EVP）模型。首先，推导了本构蠕变行为的有限元（FE）公式，并在商用有限元软件包ABAQUS中实现了定义材料的机械行为（UMAT）的用户子例程。通过圆柱体三轴蠕变试验对数值模拟进行了验证，结果表明，该模型可以有效预测黏土的蠕变响应，从而弥补了ABAQUS蠕变模型的不足。然后，所提出的模型用于研究地下实验场地周围黏土岩层的长期稳定性。根据三轴蠕变试验的结果以及对衬砌变形的现场监测，使用反分析方法获得了岩石随时间变化的材料蠕变参数。预测的衬砌变形与现场数据非常吻合，大多数相对误差小于3.5％。围岩的蠕变区表明水平范围大于垂直范围。实践证明，所提出的模型可以对黏土岩石的蠕变特性提供准确的预测，显示出评估大型地下工程结构的长期稳定性和可靠性的潜力。
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