采矿与安全工程学报2018，Vol.35Issue(1)：34-39,6.DOI:10.13545/j.cnki.jmse.2018.01.005
U型约束混凝土补强机制研究及应用
Study and application of strengthen mechanism of U-type confined concrete
摘要
Abstract
The problem of lack of bearing capacity of traditional arch centering of late stage could be solved by U-type confined concrete arch centering effectively. But the grouting holes could reduce the bearing capacity. It becomes the key part of the U-type confined concrete arch centering and should be strengthened. In order to study the mechanical properties of U-type confined concrete arch centering with grouting holes, the short cylinders of U-type confined concrete with grouting holes are analyzed. The indexes of strength α and economic β are used to study the mechanical properties under three types of strengthen and various strengthen plate thickness. The study result shows that the reinforcement way with a vertical plate could improve the capacity of short cylinder up to 115.6％; the reinforcement way with two horizontal plates could improve the capacity of short cylinder up to 105.8％; and the rein-forcement way with a square steel disc with a hole could improve the capacity of short cylinder up to 103.8％, respectively. When the strengthen plate thickness ranges from 14 mm to 22 mm, the index of economic β for the reinforcement way with a vertical plate reaches its peak value. The reinforcement way with a vertical plate is verified by a full scale model experiment and then it is applied in engineer-ing and shows good effects.关键词
U型约束混凝土/灌注口/补强/承载力/短柱/拱架Key words
U-type confined concrete/grouting holes/reinforcement/bearing capacity/short cylinder/arch centering分类
矿业与冶金引用本文复制引用
卢玉华,姜宝凤,王琦,于恒昌,章冲,秦乾,江贝,孙会彬,贺广良..U型约束混凝土补强机制研究及应用[J].采矿与安全工程学报,2018,35(1):34-39,6.基金项目
国家自然科学基金项目(51674154,51474095) （51674154,51474095）
中国博士后科学基金项目(2016M590150,2016M602144) （2016M590150,2016M602144）
深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1519,SKLGDUEK1717) （SKLGDUEK1519,SKLGDUEK1717）
