Anisotropic modeling of layered rocks incorporating planes of weakness and volumetric stress,Energy Science & Engineering

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Anisotropic modeling of layered rocks incorporating planes of weakness and volumetric stress
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2019-11-19 , DOI: 10.1002/ese3.551
Shanchao Hu _{1,

2} , Yunliang Tan ₁ , Hui Zhou ₃ , Wenkai Ru ₁ , Jianguo Ning ₁ , Jun Wang ₁ , Dongmei Huang ₁ , Zhen Li ₄

Affiliation

Layered rocks exhibit notable transverse isotropy and have a significant impact on the deformation and failure characteristics of underground structures. To a large extent, the mechanical properties of layered rocks are related to the structure and stress state of their bedding planes. To obtain an in‐depth understanding of the deformation and yield characteristics of layered rocks, a mechanical model for layered rocks incorporating planes of weakness and volumetric stress is proposed by improving the strain‐hardening/softening ubiquitous‐joint model based on continuum mechanics methods. In this mechanical model, elastoplastic equations for the matrix and bedding planes of layered rocks are established. The evolution of the mechanical parameters of the matrix and bedding planes of layered rocks with the internal variable is determined. In addition, the sensitivity of the model parameters is analyzed, and a method for determining the parameters is provided to reduce the complexity in obtaining these parameters. The numerical calculation results for the laboratory tests on layered sandstone specimens under various stress levels agree relatively well with the test results, thereby validating the effectiveness of the improved model. The methods and results of this study provide a significant reference for the analysis of the deformation and failure of other layered rocks.

中文翻译：

包含弱化平面和体积应力平面的层状岩石的各向异性模拟

层状岩石表现出显着的横向各向同性，并且对地下结构的变形和破坏特性产生重大影响。在很大程度上，层状岩石的力学性能与其层理面的结构和应力状态有关。为了深入了解层状岩石的变形和屈服特性，通过改进基于连续力学方法的应变硬化/软化普遍存在的模型，提出了一种结合了软弱和体积应力平面的层状岩石力学模型。在该力学模型中，建立了层状岩石矩阵和层理面的弹塑性方程。确定了具有内部变量的层状岩石基质和层理面力学参数的演变。此外，分析了模型参数的敏感性，并提供了一种确定参数的方法，以降低获得这些参数的复杂性。在不同应力水平下对分层砂岩样品进行实验室测试的数值计算结果与测试结果相对吻合，从而验证了改进模型的有效性。这项研究的方法和结果为分析其他层状岩石的变形和破坏提供了重要的参考。从而验证了改进模型的有效性。这项研究的方法和结果为其他层状岩石的变形和破坏分析提供了重要的参考。从而验证了改进模型的有效性。这项研究的方法和结果为分析其他层状岩石的变形和破坏提供了重要的参考。

更新日期：2019-11-19

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