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沿空留巷围岩的失稳机理与控制技术

发表时间:2011-03-31  浏览量:1383  下载量:452
全部作者: 李琰庆
作者单位: 淮南矿业集团谢一矿
摘 要: 通过分析沿空巷道老顶断裂前后形成的“悬臂梁”和“砌体梁”结构的运动特征,研究得出沿空留巷围岩可能发生切落、回转、破断(垮冒)和冒落等4种失稳,进而提出巷内锚网组合支护加固煤帮防止切落,控制顶板防止冒落;巷旁工字钢配砌筑矸石带或浇筑充填料,增加支撑点,形成“简支梁”结构,阻止老顶回转和下沉;动压影响范围内辅以单体液压支柱弱化应力作用,防止老顶断裂和跨冒等联合控制技术。经淮南、淮北矿区的实践证明,该技术能有效控制围岩的变形与失稳,并取得了良好的技术、经济效果。
关 键 词: 采矿工程;沿空留巷;老顶失稳;控制技术
Title: Failure mechanism and controlling technology of surrounding rock in gob-side entry retaining
Author: LI Yanqing
Organization: Xieyi Mine, Huainan Mining Industry (Group) Co., Ltd.
Abstract: By analyzing the movement characteristics of ‘cantilever beam’ and ‘lining beam’ which are respectively formed before and after main roof fracturing above gob-side entry retaining, this paper obtains that surrounding rock may occur cutting off, rotating, breaking and caving failure. And then it is proposed that anchor combined support in the roadway can reinforce coal sidewall to prevent cutting off and control roof to prevent caving, I-beam with gangue wall or filling materials support roadside and add a support point to form ‘simply-supported beam’ structure which plays a role to prevent rotating and sinking, individual hydraulic prop is used to weaken stress influence within the dynamic pressure. By the practice of Huainan and Huaibei mining area these controlling technology have been proved to effectively control deformation and failure of gob-side entry retaining and achieved good technical and economic effects.
Key words: mining engineering; gob-side entry retaining; main roof failure; controlling technology
发表期数: 2011年3月第6期
引用格式: 李琰庆. 沿空留巷围岩的失稳机理与控制技术[J]. 中国科技论文在线精品论文,2011,4(6):553-558.
 
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