Two miners were fatally injured when a pillar bump occurred during retreat mining in a southern West Virginia coal mine. The mine was operating in the Eagle seam with overmining in the No. 2 Gas and Powellton seams. A coal bump is defined as a sudden and violent failure of coal caused by the release of stored strain energy in the pillar. While significant strides have been made by academia, industry, and regulatory agencies to better understand bump conditions and mitigation techniques, coal bumps represent a long standing, highly site-specific engineering problem in which the exact failure mechanism is not clearly understood. In this case history, a cut-by-cut analysis of retreat mining operations was conducted on the 4 East Main leading up to the pillar bump event. Numerical input parameters were derived from site-specific geologic information and mine geometry for the analysis of pillar stress conditions and energy release using LaModel. An overview of stress conditions in the panel was presented including a precursor event that occurred two crosscuts inby the bump site. The methodology presented in the paper for the evaluation of the fatal bump event can be used for the identification of bump prone conditions prior to development and retreat of a mining area.

西维吉尼亚州南部一个煤矿的撤退开采过程中，当一个支柱颠簸发生时，两名矿工受伤。该矿在Eagle煤层中作业，而在第二号Gas和Powellton煤层中开采过。煤块的定义是由于储存在支柱中的应变能的释放而导致的煤的突然剧烈破坏。尽管学术界，工业界和监管机构在更好地了解颠簸状况和缓解技术方面已取得了长足的进步，但煤颠簸仍是一个长期存在的，针对特定地点的工程问题，在其中尚不清楚确切的故障机理。在此案例历史中，对导致铅柱颠簸事件的东四区进行了后撤采矿作业的详细分析。数值输入参数来自特定地点的地质信息和矿山几何形状，用于使用LaModel分析柱应力条件和能量释放。概述了面板中的应力状况，其中包括前冲事件，该事件在隆起部位附近发生了两次横切。本文中提出的用于评估致命撞击事件的方法可用于在矿区开发和撤退之前识别容易发生撞击的状况。