纵向采空区群失稳动态演化过程研究

Study on Dynamic Failure Process of Longitudinal Goaf Group

基于细观损伤力学,运用RFPA岩石破裂过程分析软件,建立纵向采空区群动态失稳的等效数值模型,研究单列和多列纵向采空区群的动态失稳演化过程。结果表明:相比于单列纵向采空区群,多列纵向采空区群的顶板更易发生破坏,岩体结构的抗破坏能力较弱;单列和多列纵向采空区群动态失稳具有不同的演化过程,即单列纵向采空区群按照空区群左右两侧帮壁、顶(底)板到整体的顺序失稳破坏,多列纵向采空区群按照间柱、空区群顶(底)板到左右两侧帮壁的顺序失稳破坏。

Based on microscopic damage mechanics, a software RFPA of rock failure process analysis was used to build an equiv- alent numerical model about dynamic failure process of longitudinal goaf group. And dynamic instability evolutions of single- row and multi-column longitudinal goaf group were studied. The results showed that, compared to the single-row longitudinal goaf group, the roof of multi-column longitudinal goaf group could be easier damaged and the damage resistance ability of rock structure was weaker. The dynamic instability evolution process of single-row goaf group was different from the multi-column goal group.That was, the instability and failure order of the single-row goal group was from the left and right side of the wall, as well as roof and floor to the whole. However, the instability and failure order of the multi-column goal group was from the rib pillar, roof and floor to the left and right side of the wall.