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Influences of Water Vapor on Roof Fall Accidents in Selected Underground Coal Mines in Malawi

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Title: Influences of Water Vapor on Roof Fall Accidents in Selected Underground Coal Mines in Malawi
Authors: Yasidu, Umali M. Browse this author
Fujii, Yoshiaki Browse this author →KAKEN DB
Kodama, Jun-ichi Browse this author →KAKEN DB
Fukuda, Daisuke Browse this author →KAKEN DB
Maneya, George J. Browse this author
Dandadzi, Johnson Browse this author
Dassanayake, Anjula B. N. Browse this author
Issue Date: 2019
Publisher: Hindawi Publishing Corporation
Journal Title: Advances in Civil Engineering
Volume: 2019
Start Page: 1
End Page: 17
Publisher DOI: 10.1155/2019/5350686
Abstract: To develop affordable countermeasures against the roof falls, the accident records of Mchenga Mine were investigated as the first step. Based on the accident records, it was found that roof falls occurred most in April and May. Humidity measurements were taken both in the underground mine and at surface, and humidity peak appeared in April. The accident occurrence and the underground humidity had a positive correlation in which no roof falls could be expected under a humidity of less than a certain value. Effect of humidity on the indirect tensile strength of the rock samples collected from the mine was investigated, and it showed that the indirect tensile strength decreased with humidity. The diffusion coefficient was measured for the rock samples collected from Mchenga Mine as well as from Kaziwiziwi Mine, and the migration of water vapor into rock mass in the roof was calculated for Mchenga case. It was clarified that the weakening of tensile strength was transmitted upward at several centimeters per day from the immediate roof. This could explain the slight difference of the accident peak in April and May from the humidity peak in April. Introducing fresh and dry outside air, if possible, will not only improve the working environment but also contribute to a decrease in roof falls.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤井 義明

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