The roots of rock engineering disaster lie not only in cross-scale deterioration and failure of rock material, but also in large deformation and instability of rock discontinuities and structural bodies. The material-structure duality of rock mass influences the mechanical behavior of rock mass, resulting in continuous-discontinuous characteristics and singularity phenomena. Nevertheless, the cognition of the dominant transformation and cooperative effect between these complex mechanisms is still vague, and there is a lack of a numerical scheme considering both material and structral effects of rock. In this study, we constructed a unified numerical scheme (Rock failure and instability analysis, RFIA) that considers both material failure and structural instability of rock mass. By establishing the statistical meso-damage constitutive model, the damage and failure of rock materials were reflected, and by developing the finite deformation numerical formation considering current state response, the large deformation and instability of rock structural body were described. The proposed numerical scheme realized the synchronous simulation of both material failure induced instability, and structural instability induced failure of rock mass. The size effect on rock under uniaxial compression and the local collapse mechanism of the surrounding rock in deep slabbing tunnel were investigated by RFIA. Meanwhile, Rock failure analysis (RFA) that only considers rock material failure and Rock instability analysis (RIA) that only considers structural instability were performed in the simulations. The results show that there are dominant and competitive mechanisms between material failure and structural instability during failure and instability process of rock. For the rock structral body with dominant geometric features, its instability plays a decisive role in inducing catastrophe. The cooperative effect of material-structure is an important mechanism, which may result in large displacement and rotation of rock mass and the abrupt release of massive energy once instability induces the failure (e.g., in situation of rockburst).

岩石工程灾害的根源不仅在于岩石材料的跨尺度退化和破坏，而且在于岩石不连续性和结构体的大变形和失稳。岩体的材料-结构二元性影响岩体的力学行为，导致连续-不连续特征和奇异现象。尽管如此，对于这些复杂机制之间的主导转换和协同作用的认识还很模糊，缺乏一个数值方案。同时考虑岩石的材料和结构效应。在这项研究中，我们构建了一个统一的数值方案（岩石破坏和失稳分析，RFIA），它同时考虑了岩体的材料破坏和结构失稳。通过建立统计细观损伤本构模型，反映了岩石材料的破坏和破坏，通过考虑当前状态响应建立有限变形数值模型，描述了岩石结构体的大变形和失稳。所提出的数值方案实现了岩体材料破坏引起的失稳和结构失稳引起的岩体破坏的同步模拟。RFIA研究了单轴受压对岩石的尺寸效应和深板巷道围岩的局部坍塌机制。同时，在模拟中进行了仅考虑岩石材料破坏的岩石破坏分析（RFA）和仅考虑结构失稳的岩石失稳分析（RIA）。结果表明，在岩石的破坏和失稳过程中，材料破坏和结构失稳之间存在主导和竞争机制。对于具有优势的岩石结构体 结果表明，在岩石的破坏和失稳过程中，材料破坏和结构失稳之间存在主导和竞争机制。对于具有支配性的岩石结构体 结果表明，在岩石的破坏和失稳过程中，材料破坏和结构失稳之间存在主导和竞争机制。对于具有优势的岩石结构体几何特征，它的不稳定性在诱发灾难中起着决定性的作用。材料-结构的协同作用是一种重要的机制，一旦失稳引起破坏（例如，在岩爆情况下），它可能导致岩体的大位移和旋转以及大量能量的突然释放。