采矿与安全工程学报2012，Vol.29Issue(6)：783-789,7.
二次沿空留巷关键块的稳定性及巷旁充填体宽度确定
The Stability of Key Block and Calculating the Width of Roadside Backfill in a Secondary Gob-Side Entry Retaining
摘要
Abstract
In order to solve the problem of gas accumulation and gas transfinite in the upper corner of high gassy working face, the technology of the secondary gob-side entry retaining is proposed based on existing technology of the gob-side entry retaining. Firstly, according to the activity law of overlying rock of the secondary gob-side entry retaining, mechanical model of key block in the working face tail is established, the mechanism of action between key block and surrounding rock of the secondary gob-side entry retaining is analyzed, the stability coefficients Ku K2 of key block are introduced, the stability criterion of the key block is determined, and calculating formula of roadside supporting resistance is derived. If Ki>\, then extrusion instability will emerge; If AT2>1, sliding instability will emerge. By taking haulage gateway of No. 512(5) working face at Xieyi coal mine in Huainan as project background, based on stability criterion of key block, determines reasonable width of roadside backfill, and the sensitivity of influencing factors on the stability of key block are analyzed. The example analy-sis shows that final strength of No.l roadside backfill and its width, mining height have great influence on the stability of key block, it is critical to improve final strength ofNo.l roadside backfill and design reasonable width of No.l roadside backfill, applying the technique of the secondary gob-side entry retaining to working face with large mining height is of more difficulty.关键词
二次沿空留巷/关键块的稳定性系数/巷旁充填体宽度/影响因素的敏感度Key words
the secondary gob-side entry retaining/ stability coefficient of key block/ the width of roadside backfill/ the sensitivity of influencing factors分类
矿业与冶金引用本文复制引用
李迎富,华心祝..二次沿空留巷关键块的稳定性及巷旁充填体宽度确定[J].采矿与安全工程学报,2012,29(6):783-789,7.基金项目
安徽理工大学博士科研基金项目 （）
国家自然科学基金重点项目(50774001) （50774001）
