MyJournals Home  

RSS FeedsSustainability, Vol. 9, Pages 2079: Analysis and Optimization of Entry Stability in Underground Longwall Mining (Sustainability)


12 november 2017 10:54:51

Sustainability, Vol. 9, Pages 2079: Analysis and Optimization of Entry Stability in Underground Longwall Mining (Sustainability)

For sustainable utilization of limited coal resources, it is important to increase the coal recovery rate and reduce mine accidents, especially those occurring in the item (gateroad). Entry stabilities are vital for ventilation, transportation and other essential services in underground coal mining. In the present study, a finite difference model was built to investigate stress evolutions around the item, and true triaxial tests were carried out at the laboratory to explore item wall stabilities under different mining conditions. The modeling and experimental results indicated that a wide coal pillar was favorable for item stabilities, but oversize pillars caused a serious waste of coal resources. As the width of the item wall decreased, the integrated vertical stress, induced by two adjacent mining panels, coupled with each other and experienced an increase on the item wall, which inevitably weakened the stability of the item. Therefore, mining with coal pillars always involves a tradeoff between economy and safety. To address this problem, an innovative non-pillar mining technique by optimizing the item surrounding structures was proposed. Numerical simulation showed that the deformation of the item roof decreased by approximately 66% after adopting the new approach, compared with that using the conventional mining method. Field monitoring indicated that the stress condition of the item was significantly improved and the average roof pressure decreased by appropriately 60.33% after adopting the new technique. This work provides an economical and effective approach to achieve sustainable exploitation of underground coal resources. Digg Facebook Google StumbleUpon Twitter
104 viewsCategory: Ecology
Sustainability, Vol. 9, Pages 2077: The Impact of Corporate Social Responsibility on the Workforce of Selected Business Firms in the United Arab Emirates: A Nascent Economy (Sustainability)
Sustainability, Vol. 9, Pages 2081: Setting the Scene for a Healthier Indoor Living Environment: Citizens` Knowledge, Awareness, and Habits Related to Residential Radon Exposure in Romania (Sustainability)
blog comments powered by Disqus
The latest issues of all your favorite science journals on one page


Register | Retrieve



Use these buttons to bookmark us: Digg Facebook Google StumbleUpon Twitter

Valid HTML 4.01 Transitional
Copyright © 2008 - 2018 Indigonet Services B.V.. Contact: Tim Hulsen. Read here our privacy notice.
Other websites of Indigonet Services B.V.: Nieuws Vacatures News Tweets Travel Photos Nachrichten Indigonet Finances Leer Mandarijn