Ground falls in longwall gateroad entries remain a concern in modern longwall operations. The gateroads are subject to changing horizontal and vertical ground stress induced by longwall extraction. These stress changes can result in failure of the strata around an entry leading to large deformations of the entry roof, floor, and ribs. The gateroad support systems are required to control the failed strata while maintaining safe access to the longwall face and unimpeded ventilation. This paper presents research that was conducted to better understand the stability issues in gateroad excavations and to develop procedures for evaluating support and layout alternatives for longwall gateroads. Using the results of a field-monitoring program and numerical model analysis of case histories, a conceptual model of gateroad support needs was developed. The conceptual model formed the basis for developing a set of equations that can be used to estimate likely roof sag and support loading for given roof geology and longwall-induced loading conditions. The developed equations were used to compare predicted gateroad stability to field study results, showing satisfactory agreement. The calculation procedures are used to demonstrate their application in assessing support alternatives at a case study mine. It is concluded that the developed analysis procedures provide realistic assessments of likely ground stability and can be used to evaluate alternative gateroad support systems at operating longwall mines.

长壁闸道入口处的地面跌落仍然是现代长壁作业中的一个问题。闸道承受着长壁开采引起的水平和垂直地面应力的变化。这些应力变化会导致入口周围的地层破坏，从而导致入口屋顶，地板和肋骨发生较大变形。需要闸道支护系统来控制失效的地层，同时保持安全进入长壁工作面和通风畅通。本文介绍了进行的研究，目的是更好地理解闸道开挖中的稳定性问题，并开发评估长壁闸道支护和布局替代方案的程序。利用现场监测程序的结果和案例历史的数值模型分析，开发了闸道保障需求的概念模型。概念模型为开发一组方程式奠定了基础，这些方程式可用于估算给定屋顶地质条件和长壁诱发的荷载条件下可能的屋顶下陷和支撑荷载。所开发的方程式用于比较预测的闸口稳定性与现场研究结果，显示出令人满意的一致性。计算程序用于证明其在评估案例研究矿山的支持方案时的应用。结论是，已开发的分析程序可对可能的地面稳定性提供现实的评估，并可用于评估运营中的长壁矿井的替代闸道支持系统。所开发的方程式用于比较预测的闸口稳定性与现场研究结果，显示出令人满意的一致性。计算程序用于证明其在评估案例研究矿山的支持方案时的应用。结论是，已开发的分析程序可对可能的地面稳定性提供现实的评估，并可用于评估运营中的长壁矿井的替代闸道支持系统。所开发的方程式用于比较预测的闸口稳定性与现场研究结果，显示出令人满意的一致性。计算程序用于证明其在评估案例研究矿山的支持方案时的应用。结论是，已开发的分析程序可对可能的地面稳定性提供现实的评估，并可用于评估运营中的长壁矿井的替代闸道支持系统。