动静载荷作用诱发深部煤岩失稳的演化规律研究

The deep roadway under construction is in the combined effect of dynamic and static loads, such as high field stress, mechanical digging or explosion loads. The increasing damage of surrounding rock under excavation unloading will cause in the surrounding rock destability failure and bring a great security risk to the normal boring of mine. Therefore, in-depth study of the evolution of deep coal-rock destabilization induced by dynamic and static loads is expected to reduce destability and caving accidents of roadway under continuing dynamic and static loads, to promote safe and efficient driving in mine. It has a very important theoretical and practical significance. Through three-dimensional dynamic and static loads experimental system, this research project will study macroscopic mechanical behavior of deep roadway, to gain evolution of deep surrounding rock deformation and destabilization induced by dynamic and static loads. By utilizing industrial CT scanning and optical measurement test system, the micromechanics behavior of coal-rock under dynamic and static loads will be investigated. Through establishing damage variables of coal- rock under dynamic and static loads within macro-micro scale, we will study macro-micro evolution of coal-rock deformation and destabilization under dynamic and static loads. Utilizing numerical simulation and damage and fracture mechanics theories to analyze perforation mechanism of crack groups under coupling dynamic and static loads in surrounding rock will establish damage criterion of destability in deep surrounding rock, and provide theoretical basis for the deep rock support.

掘进过程中深部巷道受到高地应力、机械开掘或爆炸载荷等动静载荷共同作用，巷道围岩受开挖卸荷作用，损伤不断增加，导致围岩失稳破坏，给矿井正常掘进带来极大的安全隐患。因此，深入进行动静载荷作用诱发深部煤岩失稳的演化规律研究，可望减少动静载荷持续作用引发的巷道失稳冒落事故，保障矿井安全高效掘进，具有十分重要的理论与现实意义。通过动静载荷三维实验系统，进行深部巷道围岩宏观力学行为研究，获得动静载荷作用下诱发深部围岩变形失稳的演化规律；利用工业CT技术和光测综合测试系统进行煤岩动静载荷作用下的细观力学行为研究，通过建立煤岩动静载荷下宏细观尺度内的损伤变量关系，研究动静载荷作用下煤岩破坏失稳的宏细观演化规律。利用数值分析方法和岩石损伤力学、断裂力学理论，分析动静载荷耦合作用下深部围岩裂纹群贯通机制，建立煤岩体动静耦合作用下裂纹群贯通演化模型，确立深部围岩发生失稳破坏判据，为深部围岩支护提供理论依据。

深部巷道掘进过程中处于高地应力、机械开掘或爆炸载荷等动静载荷共同作用，巷道围岩受开挖卸荷作用损伤不断增加，导致围岩失稳破坏，给矿井正常掘进带来极大的安全隐患。因此，深入进行动静载荷作用诱发深部煤岩失稳的演化规律研究，可望减少动静载荷持续作用引发的巷道失稳冒落事故，保障矿井安全高效掘进，具有十分重要的理论与现实意义。通过动静载荷三维实验系统，进行深部巷道围岩宏观力学行为研究，获得动静载荷作用下诱发深部围岩变形失稳的演化规律；利用工业CT技术和光测综合测试系统进行煤岩动静载荷作用下的细观力学行为研究，通过建立起煤岩动静载荷下宏细观尺度内的损伤变量关系，研究动静载荷作用下煤岩破坏失稳的宏细观演化规律。利用数值分析方法和岩石损伤力学、断裂力学等理论，分析动静载荷耦合作用下深部围岩裂纹群贯通机制，建立煤岩体动静耦合作用下裂纹群贯通演化模型，确立深部围岩发生失稳破坏判据，为深部围岩支护提供理论依据。