The Subtropolis Mine is a room-and-pillar mine extracting the Vanport limestone near Petersburg, Ohio, U.S. In February of 2018, mine management began implementing a heading re-orientation to better control the negative effects of excessive levels of horizontal stress. The conditions in the headings improved, but as expected, stress-related damage concentrated within crosscuts. The mine operator has worked to lessen the impact of the instabilities in the outby crosscuts by implementing several engineering controls. With the implementation of each control, conditions were monitored and analyzed using observational and measurement techniques including 3D LiDAR surveys. Since the heading re-orientation, several 3D LiDAR surveys have been conducted and analyzed by researchers from the National Institute for Occupational Safety and Health (NIOSH). This study examines (1) the characteristics of each 3D LiDAR survey, (2) the change in the detailed strata conditions in response to stress concentrations, and (3) the change detection techniques between 3D LiDAR surveys to assess entry stability. Ultimately, the 3D LiDAR surveys proved to be a useful tool for characterizing ground instability and assessing the effectiveness of the engineering controls used in the heading re-orientation at the Subtropolis Mine.

Subtropolis矿是在美国俄亥俄州彼得斯堡附近开采Vanport石灰石的有室柱矿，于2018年2月，矿山管理人员开始实施航向重新定向，以更好地控制过大水平应力的负面影响。标题中的条件有所改善，但与预期相符，与压力有关的损害集中在横切面内。矿山运营商已通过实施多种工程控制措施来减轻边界横切中不稳定因素的影响。随着每个控件的实施，使用观察和测量技术（包括3D LiDAR调查）对条件进行监视和分析。自重新定位以来，美国国家职业安全与健康研究所（NIOSH）的研究人员进行了几次3D LiDAR调查和分析。这项研究检查（1）每个3D LiDAR调查的特征，（2）响应应力集中的详细地层条件的变化，以及（3）3D LiDAR调查之间的变化检测技术，以评估进入稳定性。最终，事实证明3D LiDAR勘测是表征地面不稳定性和评估Subtropolis矿井方向重新定向中使用的工程控制措施有效性的有用工具。