动态扰动诱发嗣后充填采场灾变事故分析

Analysis on the catastrophe mechanism of backfill stope resulting from dynamic disturbance

为了明确某矿阶段嗣后充填采场破坏事故原因,结合事故现场工程实际及调查结果,采用相似模型、数值分析及现场监测手段,研究了阶段嗣后充填采场围岩变形特征、破坏模式、巷道表面变形规律。结果表明:开采活动对嗣后采场围岩及周边工程影响具有明显的区域特性;不同分段的开采活动对采场顶板位移影响程度不同,第2分段开采导致顶板最大位移增量最多,而第3分段开采时加剧了矿柱应力集中,致使矿柱发生沿近似60°的结构面发生剪切滑移破坏;同时也使位于矿柱内部邻近空区的巷道侧壁发生垮塌。通过对比分析数值模拟与现场监测的结果,证明了相似模型试验的结论。研究结论不仅全面认识了该矿阶段嗣后充填采场破坏事故原因,还明确了阶段嗣后充填采矿方法采场安全潜在危险源,可为其他类似矿山提供安全借鉴。

In order to investigate the reason of the failure of stage backfill stope during one mine, the deformation characteristics, failure mode of backfill roof and pillar and the surface displacement law of roadway have been studied by similar material simulation, numerical modeling and field monitoring based on the field engineering condition and investigation results. The results indicate that mining action has a significant influence on the stability of the stope and rock surrounding and the engineering on the perimeter zone, and it also poses a different impact on the maximum displacement of stope roof at different sublevel. The incremental quantity of roof displacement reaches the most when mining activity processes at second sublevel. And when mining at the third sublevel exacerbates the stress concentration of pillar, the splitting failure begins to appear along the pillar and the roadway in a structural plane of approximately 60°, and at the same time, the side walls nearby the goaf inside the pillar begin to collapse. Compared to the results obtained from the numerical simulation and field monitoring, the conclusions obtained by similar model test are testified. The research conclusions propose a comprehensive understanding of the reason of the collapse accident, and clarify the potential hazards of backfill stop, which can provide security references for other similar mines.