针对岩体变形失稳这一频发工程灾害为背景，以岩石时效变形破裂这一关键科学问题为核心，围绕岩石时效变形的亚临界裂纹扩展机理，开展亚临界裂纹扩展试验以及不同裂纹倾角、不同岩桥倾角的含预置裂纹岩样蠕变试验，分析岩石亚临界到临界变形损伤演化规律，建立基于亚临界裂纹扩展的岩石时效变形破裂失稳模型。开发岩石时效变形破裂失稳的连续-非连续耦合算法，实现岩石从微裂纹萌生、亚临界裂纹扩展、宏观裂纹贯通、破裂岩体滑移运动的全过程。结合工程岩体变形现场监测及动态监控预警技术，开展一系列深部岩体工程和大型岩质边坡工程在亚临界裂纹扩展过程中的流变断裂数值试验研究，掌握工程岩体动态变形发展规律，揭示深部岩体工程和岩质边坡工程的亚临界裂纹扩展流变失稳机制，提出符合工程实际且便于现场应用的简化模型以及连续-非连续耦合算法，以期为寻求深部岩体工程及边坡工程的变形失稳控制、防治方法及长期稳定性预测提供理论和应用依据。

In the proposal, aiming at the frequent occurrence of rock mass deformation and instability and taking time-dependent deformation and rupture of rock as the core scientific problem, we will carry out a series of the subcritical crack propagation tests and creep tests on pre-cracked rock specimens with different crack and rock bridge inclination angles to analyze the sub-critical crack to critical crack growth law of rock, and establish the time-dependent deformation, rupture, and instability model of rock based on sub-critical crack propagation. Then we will develop a continuous-discontinuous coupling algorithm for the time-dependent deformation, rupture, and instability model to realize the whole process from microcrack initiation, subcritical crack propagation, macroscopic crack coalescence, and slippage of failed rock. Combined with on-site dynamic monitoring and early warning technology of engineering rock mass deformation, we will perform a series of numerical simulations on rheological failure of deep rock mass and large rock slope engineering to gain an insight into the dynamic deformation characteristics of engineering rock mass. To reveal the sub-critical crack propagation rheological instability mechanism of deep rock mass and rock slope, and we will propose a simplified continuous-discontinuous coupling model for rock engineering practice and application. The work in this proposal is anticipated to enrich the theory of long-term stability evaluation and improve the methods for control and prevention of rock slope stability.