深部地下硐室高应力下围岩大变形破坏机制与稳定性控制

针对围岩高应力、大变形、强流变、强时效等综合因素系统分析深部地下硐室稳定性是目前尚未解决的关键技术难题，尤其深部煤矿安全开采、川藏铁路正常建设、水电超大硐室支护更是世界级难题和技术瓶颈。本项目在充分认识深部地下硐室围岩应力环境、力学特性的基础上，采用相似模拟实验、物理力学试验、理论研究、数值分析、现场测试与试验相结合的综合研究手段，揭示深部岩石损伤破坏特征、流变机理与硐室围岩应力场-能量场演化规律、大变形时空演化规律，构建深部地下硐室运动许可的速度场、静力容许的应力场与二维、三维围岩破坏机制，推导线性与非线性破坏准则下深部地下硐室围岩压力解析解，建立深部地下硐室失稳判别准则与多失效模式相关下复杂结构体系可靠性分析模型，开发适应于深部地下硐室的柔性、让压、超强支护新材料，提出深部地下硐室围岩控制原理、支护方案与控制关键技术，为深部地下硐室合理设计、安全建设与有效运行提供理论基础和技术支撑。

It is a key technical problem to analyze the stability of deep underground cavity systematically that has not been solved in underground engineering field, according to the comprehensive factors such as high stress, large deformation, intensive rheological, stronger aging of surrounding rocks, especially it is a world-class problem and technical bottleneck for the safe of deep coal mining, building of Sichuan-Tibet highway, supporting of super hydroelectric cavity. This project is based on a full understanding of the stress environment and mechanical characteristics of surrounding rocks in deep underground cavity, the combination of similar simulation experiment, physico-mechanical text, theoretical research, numerical simulation and field test is used, the deep rock damage and failure characteristics, the rheological mechanisms and the evolution laws of stress field and energy field in surrounding rocks, and the evolution laws of large deformation in time and space are revealed, the allowable velocity field, the allowable stress field and 2D and 3D surrounding rocks failure mechanisms are constructed, the calculation formulas of rock pressure in deep underground cavity under linear and nonlinear failure criterion are derived, the complex structure system reliability models with multiple correlated failure modes and the criterions of surrounding rocks instability in deep underground cavity are established, new flexible, yielding, super strong supporting materials are developed what adapt to deep underground cavity, support strategies and key control technology of control principle of surrounding rocks of deep underground cavity are put forward, it provides theoretical basis and technical support for safe construction and effective operation of deep underground cavity.