Application of coal mine roof rating in Chinese coal mines

• Published in: 矿业科学技术学报（英文版） Vol. 28; no. 3; pp. 491 - 497
• Main Authors: Wang Yongyin, Taheri Abbas, Xu Xianbi
• Format: Journal Article
• Language: English
• Published: Mining College, Guizhou University, Guiyang 550025, China 2018; School of Civil Environmental and Mining Engineering, University of Adelaide, Adelaide 5005, Australia%School of Civil Environmental and Mining Engineering, University of Adelaide, Adelaide 5005, Australia%Shanjaoshu Coal Mine, Guizhou Panjiang Investment Holdings Group Co., Ltd, Liupanshui 553533, China
• Subjects: Underground mine; Roof stability; Coal mine roof rating; Panjiang coal field
• ISSN: 2095-2686
• DOI: 10.3969/j.issn.2095-2686.2018.03.016

The coal mine roof rating (CMRR) is a measure of roof quality or structure competency for bedded roof types typically of underground coal mines. The CMRR has been used widely in the US, South Africa, Canada and Australia. In order to investigate the application of the CMRR system in Chinese coal mines, two coal mines in China located in Panjiang Coal Field in Guizhou Province were investigated. Field data were collected which is required to calculate the CMRR value based on underground exposure. The CMRR values of 11 locations in two coal mines were calculated. The investigations demonstrated that the chance of mine roof failure is very low if the CMRR value is more than 50, given adequate support is installed in mine. It was found that the CMRR guideline are useful to preliminarily investigate stability in Panjiang Coal Field mines.