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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 clarify the cause of subsequent filling stope failure in a mine, combining with the actual project site and the survey results, similar models, numerical analysis and on-site monitoring were used to study the deformation characteristics, failure modes, Deformation law. The results show that the mining activities have obvious regional characteristics on the influence of the subsequent stope surrounding rock and surrounding engineering. The mining activities of different sections have different influence on the displacement of roof stope, the maximum increment of roof displacement caused by the second section mining is the most, During the mining of the third section, the stress concentration of the pillars is aggravated, resulting in the shear slip failure of the pillars along the structural plane of approximately 60 °. Meanwhile, the side walls of the tunnel near the empty pillars collapse. By comparing the results of numerical simulation and on-site monitoring, the conclusion of similar model test is proved. The conclusions of the study not only fully understand the cause of the subsequent storage stope failure at the mine stage, but also clarify the potential dangerous sources of stope safety after the subsequent filling mining method in the mine stage, which can provide reference for other similar mines.