黄金科学技术 ›› 2022, Vol. 30 ›› Issue (2): 254-262.doi: 10.11872/j.issn.1005-2518.2022.02.133
Qinli ZHANG(),Yibo YU(
),Daolin WANG
摘要:
安全是矿山生产中极其重要的一环,充填体悬臂结构是龙首矿进路回采中十分常见的安全隐患形式,由于自重和深部地应力的作用,容易发生崩塌破坏现象。根据龙首矿实际情况,其充填体悬臂结构失稳破坏主要有崩落式和拉裂—坠落式2种形式。基于悬臂梁理论,建立进路人工假顶悬臂和充填围岩悬臂力学计算模型,通过理论计算悬臂极限长度、数值模拟验证和稳定性系数K并进行综合评价,以保障矿山安全生产。结果表明:充填体悬臂的稳定性受顶部裂缝深度比和实际长度的影响,其极限长度与数值模拟结果基本一致。同时,稳定性系数K能够有效统计不同裂缝条件下充填体悬臂状态,判断充填体悬臂顶部裂缝深度比情况。因此,悬臂极限长度和稳定性系数K能够有效评价龙首矿充填体悬臂的稳定性,实际应用简单,计算结果与现场调查情况基本吻合,对于潜在的充填体悬臂结构安全隐患能起到及时预警的效果。
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