Longwall gateroad entries are subject to changing horizontal and vertical stress induced by redistribution of loads around the extracted panel. The stress changes can result in significant deformation of the entries that may include roof sag, rib dilation, and floor heave. Mine operators install different types of supports to control the ground response and maintain safe access and ventilation of the longwall face. This paper describes recent research aimed at quantifying the effect of longwall-induced stress changes on ground stability and using the information to assess support alternatives. The research included monitoring of ground and support interaction at several operating longwall mines in the U.S., analysis and calibration of numerical models that adequately represent the bedded rock mass, and observation of the support systems and their response to changes in stress. The models were then used to investigate the impact of geology and stress conditions on ground deformation and support response for various depths of cover and geologic scenarios. The research results were summarized in two regression equations that can be used to estimate the likely roof deformation and height of roof yield due to longwall-induced stress changes. This information is then used to assess the ability of support systems to maintain the stability of the roof. The application of the method is demonstrated with a retrospective analysis of the support performance at an operating longwall mine that experienced a headgate roof fall. The method is shown to produce realistic estimates of gateroad entry stability and support performance, allowing alternative support systems to be assessed during the design and planning stage of longwall operations.

长壁门道入口会受到由提取的面板周围的负载重新分配引起的水平和垂直应力的变化。应力变化会导致入口发生显着变形，包括屋顶下垂、肋骨膨胀和地板隆起。矿山运营商安装不同类型的支架来控制地面响应并保持长壁工作面的安全通道和通风。本文介绍了最近的研究，旨在量化长壁应力变化对地面稳定性的影响，并使用这些信息来评估支护替代方案。该研究包括监测美国几个正在运营的长壁矿山的地面和支撑相互作用，分析和校准充分代表层状岩体的数值模型，观察支持系统及其对压力变化的反应。然后使用这些模型研究地质和应力条件对地面变形的影响以及各种覆盖深度和地质情况下的支撑响应。研究结果总结为两个回归方程，可用于估计由于长壁引起的应力变化可能发生的顶板变形和顶板屈服高度。然后使用此信息来评估支撑系统保持屋顶稳定性的能力。该方法的应用通过对经历了顶板顶板塌陷的正在运营的长壁矿的支护性能的回顾性分析来证明。该方法被证明可以产生对入口稳定性和支撑性能的真实估计，