复杂条件煤巷掘进顶板控制数值模拟及的应用.doc

复杂条件煤巷掘进顶板控制数值模拟及的应用 　　摘 要:为了解决刘庄煤矿大断面煤巷复合破碎顶板稳定性难于控制,制约快速掘进,影响安全施工和巷道维护这一重大工程问题,运用FLAC3D数值模拟分析,对巷道断面和支护进行优化设计,提出人造拱形断面及滞后迎头一段距离的弱化支护技术,实现了最高月掘进1 510 m的好成绩,为煤巷快速掘进顶板控制提供了保障。?? 　　关键词:复合破碎顶板;大断面;人造拱形断面;滞后支护;顶板控制?? 　　中图分类号:TD325.1文献标识码:A 　　文章编号:1672-1098(2010)03-0023-06?お? 　　 　　收稿日期:2010-08-12?? 　　作者简介:魏敬喜(1983-),男,安徽淮南人,在读硕士,研究方向:矿山压力与岩层控制。Numerical Simulation Research on Roof Control of Roadway in ??Excavation under Complex Conditions and Its Application?? 　　WEI Jing-xi,HUA Xin-zhu,LI Ying-fu?? 　　(School of Energy and Safety, Anhui University of Science and Technology, Huainan Anhui 232001, China)?? 　　Abstract:In order to solve the difficult engineering problems of compound broken roof control of roadway in coal seam with large cross-section, limiting fast excavation and safe construction and roadway maintenance, optimal design of roadway cross-section and its support was performed by using FLAC3D numerical simulation. Technology of man-made arch cross-section with delayed support at some distance from roadway heading face was proposed. With the technology a good effect of 1510 meters of excavation development in one month was achieved. The technology provides guarantee for roof control in fast excavation of roadway.?? 　　Key words:compound broken roof; large cross-section; man-made arch cross-section; delayed support; roof control?お? 　　 　　近年来,随着矿井开采深度的增加,导致复合顶板破碎,使大断面巷道的受力状态逐渐变的复杂,容易出现顶板事故,影响巷道快速掘进,给安全施工和巷道维护带来了隐患[1-3]。尤其,随着综采、综放技术的应用和安全高产高效矿井建设的迅猛发展,采煤速度和掘进速度不匹配的问题日益突出,解决高地应力、复合破碎顶板、大断面下煤巷掘进的顶板控制技术显得尤为重要。而根据不同地质和生产技术条件进行顶板控制及施工方法的创新,可以改善巷道的围岩稳定性,提高支护效果,同时达到快速掘进的目的[4-6]。本文提出人造拱形断面及滞后迎头一段距离的弱化支护技术,为煤巷快速掘进顶板控制提供了保障。工业性试验地点选在刘庄煤矿121102工作面机巷进行。?? 　　1 生产技术条件?? 　　121102工作面机巷位于1水平E2采区,11-2煤可采,工作面四周及上下煤层均未开采。总体形态为一单斜构造,平均倾角为16°。老顶为细砂岩,顶板10.0 m处发育1条0.8 m的煤线,顶底板为岩性较弱的砂质泥岩(见图1)。?? 　　机巷掘进净断面为??L??=5 000 mm,??H??=4 000 mm。采用锚网索联合支护,每排布置15根锚杆, 顶板布置7根锚杆, 帮部布置8根锚杆; 锚索为??17.8 mm预应力钢绞线制作,??L??=6 200 mm,排距为2 400 mm,每排3根,每个绞车窝施工一根锚索,每根锚索使用4卷Z2350树脂药卷,压板为350 mm×350 mm×10