深部煤矿真三维扰动应力下煤岩固-气耦合失稳致灾机理

随着浅部资源的枯竭，煤炭开采深度逐渐增加，煤与瓦斯突出、冲击灾害、复合动力灾害等频繁发生。由于构造应力和工程扰动的影响使得工程岩体处于真三维高静载应力和复杂扰动荷载状态。本项目利用自主研制的多功能真三轴流固耦合实验系统，开展真三维应力条件下含瓦斯煤岩体固-气耦合动力灾害实验研究。进行复合煤岩试样在真三维高静载应力和低频周期扰动载荷下的动力破坏实验。分析复合煤岩试样的动力破坏特性和动力灾害的演化过程及致灾机理。揭示中间主应力、气体压力、扰动灾害频率、扰动载荷幅值等与深井动力灾害致灾过程、机理之间的关系；建立动力灾害演化过程中3D声发射时空演化特征与致灾过程的内在联系。分析动力灾害致灾演化过程中颗粒弹射时空分选特性，揭示真三轴扰动应力下煤岩动力破裂机制，阐释深井动力灾害能量非线性释放致灾机理。研究成果可为深部资源的安全绿色开发、灾害预警防控治理等提供重要的理论支撑和技术指导。

With the depletion of shallow coal resources and the gradual increase in mining depth, coal & gas outburst, rockburst, and compound dynamic disasters occurred frequently. Due to the influence of tectonic stress and engineering disturbance, the engineering rock mass is in high three-dimensional static and complex disturbed load state. This project would comprehensively use experimental research, theoretical analysis, etc., and use the self-developed multi-functional true triaxial fluid-solid coupling experimental system to carry out experimental research on coal-rock solid-gas coupling dynamic disasters under true triaxial stress conditions. We would conduct dynamic failure experiments of composite coal-rock samples subjected to high-true triaxial static stress and low-frequency periodic disturbance loads. We would analyze the dynamic failure characteristics of composite coal-rock samples, the evolution process of dynamic disasters and the disaster mechanism. The experimental results could reveal the relationship between the intermediate principal stress, gas pressure, disturbance disaster frequency, disturbance load amplitude, etc. and the disaster-causing process and mechanism of deep coal mine dynamic disasters. The acoustic emission system would be used to collect the 3D acoustic emission signals during the experiment, the inherent relationship between the 3D acoustic emission spatiotemporal evolution characteristics and the disaster-causing process would be established. In addition, the temporal and spatial separation characteristics of particle ejection during the evolution of dynamic disasters would be analyzed, and the dynamic fracture mechanism of coal rock under true triaxial disturbance stress could be revealed. Based on the experimental results, the dynamic disaster energy evolution equation under true triaxial stress conditions could be established. The research results can provide important theoretical support and technical guidance for the safe and green development of deep resources, disaster warning, prevention and control, etc.