According to the 2010–2019 Mine Safety and Health Administration (MSHA) accident report database, 91% of reported ground control accidents in US longwall mines were caused by roof instability. Gateroads are subjected to significant changes in loading conditions from the development to the longwall abutment loading phases. When combined with thinly bedded shale roof, found in many US longwall coal mines, the design of efficient roof support becomes challenging. In previous work, the bonded block modeling (BBM) of roof by UDEC was validated against field extensometer measurements in a longwall entry roof at a 180-m depth of cover. The BBM was shown capable of capturing delamination and buckling of shale roof, one of the main roof instability mechanisms in longwall mines. This paper presents the recent findings on the roof-support interaction using BBM models of the same longwall entry. The effects of cable bolts, roof bolt density, and strap support on potential roof instability are studied. Results demonstrate the potential for BBM numerical models to help understand the complex roof and support system interactions and to assist with optimizing gateroad support systems.

根据2010-2019年矿山安全与健康管理局（MSHA）事故报告数据库，美国长壁矿山报告的地面控制事故中91%是由顶板不稳定引起的。从开发到长壁桥台加载阶段，大门道路的加载条件会发生显着变化。当与美国许多长壁煤矿中发现的薄层页岩顶板结​​合使用时，高效顶板支撑的设计变得具有挑战性。在之前的工作中，UDEC 的屋顶粘结块建模 (BBM) 已根据覆盖层深度为 180 米的长壁入口屋顶的现场引伸计测量进行了验证。 BBM 被证明能够捕获页岩顶板的分层和屈曲，这是长壁矿山顶板的主要不稳定机制之一。本文介绍了使用同一长壁入口的 BBM 模型对顶板-支撑相互作用的最新发现。研究了缆索锚杆、顶板锚杆密度和带式支撑对潜在顶板失稳的影响。结果表明，BBM 数值模型有潜力帮助理解复杂的屋顶和支撑系统的相互作用，并协助优化道路支撑系统。