煤矿安全2025，Vol.56Issue(3)：148-156,9.DOI:10.13347/j.cnki.mkaq.20240359
深立井过突出煤层群高性能钢纤维混凝土井壁研究与应用
Research and application of high performance steel fiber concrete wall in deep shaft passing through outburst coal seam group
摘要
Abstract
Aiming at the support problems when the coal mine deep vertical shaft passes over the outburst coal seam group,the use of steel fiber concrete shaft lining structure is proposed.Firstly,the benchmark mix ratio of high-performance concrete for shaft lin-ing is obtained through orthogonal design configuration,and the mechanical properties of concrete under different steel fiber mixing rates are investigated.Then,the support project at the coal uncovering of the second return shaft of Dingji Coal Mine is taken as the background,and based on the similarity criterion,the model tests of the shaft lining under uneven loads are carried out.The test res-ults show that the high-performance steel fiber concrete has good mechanical properties,and the compressive strength,tensile strength and flexural strength of the high-performance steel fiber concrete are about 5.3%,37.5%and 52.5%higher than those of the ordinary concrete when the steel fiber mixing amount is 0.4%,respectively.Under the action of uneven load,the bearing capacity of high-performance steel fiber concrete shaft lining structure is about 13.2%-15.6%higher than that of plain concrete shaft lining.The circumferential compressive strain of the optimized high-performance steel fiber concrete shaft lining is from-230.0×10-6 to-587.2×10-6,which is much smaller than its ultimate compressive strain value,indicating that this new type of shaft lining structure is safe and reliable.关键词
深立井/井筒揭煤/围岩失稳/钢纤维混凝土/井壁结构Key words
deep vertical shaft/coal uncovering of vertical shaft/surrounding rock instability/steel fiber reinforced concrete/shaft lining structure分类
矿山工程引用本文复制引用
张辉,姚直书,郑定康,沈仁为..深立井过突出煤层群高性能钢纤维混凝土井壁研究与应用[J].煤矿安全,2025,56(3):148-156,9.基金项目
国家自然科学基金资助项目(52174104,51674006) （52174104,51674006）
安徽省重点研发资助项目(202004a07020034) （202004a07020034）
