Coal mine entry rating system:A case study

• 作者: Mark A.Van Dyke Ted M.Klemetti Craig Compton
• 来源期刊: 矿业科学技术学报（英文版）
• 年，卷（期）: 2021,（1）
• 页码范围: 145-151
• 页数: 7页
• 语种: 英文

摘要

Coal mines are continuously seeking to determine the performance of entries with different ground con-trol products and installation methods. There are many factors that impact how an entry will perform which include but are not limited to geology, overburden, bolting type and pattern, and mine design. At the National Institute for Occupational Safety and Health (NIOSH), research has been instituted to examine the relationship of the parts of a coal mine entry as a system and not as individual components. To study this relationship, the first step in this study was to create a numeric rating system that accu-rately reflects visual observations of the mine entry and is easy to implement. NIOSH researchers devised this rating system to improve upon previous ideas, offering increased flexibility which can be incorpo-rated into an overall entry condition that offers different levels of confidence based on the user's time devoted to the inspection. This new entry rating system was implemented at three different mines over varying periods of time to evaluate the ground response to the geology, bolt installation pattern, stress changes by mining, overburden, and time dependency.