Analysis of Secondary Roof Structure of the Working Face in Shendong Mining Area

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• 作者：Shuai Zhao ; Shiliang Wu ; Lulin Yang ; Hui Wang
• 关键词：Roof structure ; Secondary roof ; Roof pressure ; Additional static load coefficient
• 刊名：Geotechnical and Geological Engineering
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：35
• 期：1
• 页码：195-202
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Geotechnical Engineering & Applied Earth Sciences; Hydrogeology; Terrestrial Pollution; Waste Management/Waste Technology; Civil Engineering;
• 出版者：Springer International Publishing
• ISSN：1573-1529
• 卷排序：35

文摘

A new form of roof—”secondary roof structure” form, according to the characteristics of significant differences existing between the measured roof pressure and the roof pressure calculated by “support-surrounding rock” formulas, exists in working face that was mined under the upper gob at short range in Shendong mining area. The reasons why additional static load of secondary roof came into being were gained through the analysis of main roof weight distribution coefficient. It is that main roof can not transfer all the static load to the front coal wall and the rear caved gangue, and partial weight of the gangue of upper gob served as the additional static load attaching to the roof of working face. The roof parameters of five working faces mining under the upper gob were counted based on the field measurement and theoretical analysis. What is more, here, the relationship between the M/L value and the roof form was analyzed. Also the roof pressure of 21305 working face of 1−2 coal seam was calculated based on the secondary roof structure model, and the additional static load coefficient (T) was used as measurement of the additional static load of secondary roof. Finally, the directions which can be made a breakthrough in theoretical research of secondary roof were introduced.