摘要
采动影响下的高支承压力,造成鹤煤九矿31巷硐群软弱围岩发生蠕变破坏乃至返修,提出了深浅交错全断面注浆和对穿锚索的硐室围岩加固方法。采用相似模拟试验研究了该巷硐群在强支承压力作用下的失稳机理,试验表明:随着顶压增加,硐室两侧岩柱变形持续增加,其承载能力持续降低;对穿锚索的载荷先增加,而后呈现波浪状调整状态;对穿锚索对于增加岩柱表层压应力及其承载能力非常重要;窄岩柱承受了更高的支承压力,破坏更为严重,两帮锚固体表现为整体移近。工业试验表明,对穿锚索能够有效控制硐室帮岩柱和硐室围岩的稳定。
According to the problem of creep damage and reinforcement of roadway and chamber groups influenced by mining with high abutment stress and weak adjacent rock in Hebi 9th Colliery, strengthening method has been proposed, characterized with full cross-section, shallow-deep hole grouting and two-ended cables. The instability mechanism of roadway and chamber groups with high abutment stress has been studied by means of analogue simulation. The study has shown that as the top pressure increases, displacement of chamber rock pillar increases; bearing capacity of pillar decreases; loads of two-ended cables increases at first, then adjusts continuously in wavy shape. Two-ended cables are vital to the bearing capacity and compressive stress increase of wall surface. Narrow rock pillar is seriously damaged by high abutment stress. Overall movements happen in wall anchorage body. The industry tests have shown that the two-ended cables can effectively help to control the stability of pillar and adjacent rock.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2015年第5期735-740,747,共7页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(U1304517)
河南省教育厅科学技术研究重点项目(13A440334)
河南省高等学校青年骨干教师资助计划项目(2010GGJS-058)
河南理工大学博士基金项目(B2012-077)
关键词
巷硐群
采动影响
相似模拟
破坏特征
对穿锚索
roadway and chamber groups
mining affection
analogy simulation tests
damage character
two-ended cables
