Abstract In this study, 3-D particle-based discrete element methodology (DEM) is applied to investigate the mechanical and failure characteristics of fissured marble specimens in true triaxial compression with a new loading stress path. The new loading stress path is controlled by two loading parameters: the initial confining pressure σ 0 and the loading stress ratio b. In the numerical investigation, eighty-eight numerical fissured marble specimens are designed based on fissure arrangements, such as the fissure length 2 a , fissure inclination angle α , fissure ligament length 2 L , loading stress ratio b and initial confining pressure σ 0 . The mechanical properties, including the peak strength and effective elastic modulus, and the associated failure characteristics are quantitatively analyzed. Three different ultimate failure modes of the fissured marble specimens in true triaxial compression are summarized by numerical simulations. Numerical results indicate that the peak strength and equivalent elastic modulus are enhanced with increases in the loading stress ratio and initial confining pressure. It can be found from the numerical results that the influence of the initial confining pressures is more significant. The present numerical investigations on fissured marble specimens under true triaxial compression can provide a deep understanding of mechanical and failure behaviors of rock masses in underground construction.

中文翻译：

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真三轴压缩下裂隙大理石试样的力学和破坏特性：来自 3-D 数值模拟的见解

摘要 在这项研究中，基于 3-D 粒子的离散元方法 (DEM) 被用于研究裂纹大理石试样在具有新加载应力路径的真三轴压缩下的力学和破坏特性。新的加载应力路径由两个加载参数控制：初始围压 σ 0 和加载应力比 b。在数值研究中，根据裂隙长度2 a 、裂隙倾角α 、裂隙韧带长度2 L 、加载应力比b 和初始围压σ 0 等裂隙排列设计了88个数值裂隙大理石试件。机械性能，包括峰值强度和有效弹性模量，以及相关的失效特征进行了定量分析。通过数值模拟总结了裂缝大理岩试样在真三轴压缩下的三种不同的最终破坏模式。数值结果表明，峰值强度和等效弹性模量随着加载应力比和初始围压的增加而增强。从数值结果可以看出，初始围压的影响更为显着。目前对真三轴压缩下裂隙大理岩试样的数值研究可以深入了解地下施工中岩体的力学和破坏行为。数值结果表明，峰值强度和等效弹性模量随着加载应力比和初始围压的增加而增强。从数值结果可以看出，初始围压的影响更为显着。目前对真三轴压缩下裂隙大理岩试样的数值研究可以深入了解地下施工中岩体的力学和破坏行为。数值结果表明，峰值强度和等效弹性模量随着加载应力比和初始围压的增加而增强。从数值结果可以看出，初始围压的影响更为显着。目前对真三轴压缩下裂隙大理岩试样的数值研究可以深入了解地下施工中岩体的力学和破坏行为。