U型钢封闭式可缩性钢架承载特性试验研究
发布时间：2019-06-04 23:07
【摘要】：通过室内模型试验对3榀不同位置设置可缩接头的U型钢马蹄形封闭可缩钢架进行分级均布加载,并采集不同荷载下钢架不同位置的径向位移及各接头滑移量.结果表明:1)接头滑移速率决定钢架承载力及其变形特性,接头快速滑移时钢架承载力不稳定性增加,让压变形明显;2)封闭可缩钢架接头滑移特性与接头处钢架内力组合有关,随总外荷载的增加,拱顶接头最先发生滑移且速率较快,其次为拱脚接头,拱底接头最难滑移;3)拱顶接头发生滑移时拱顶下沉最为明显,建议当围岩荷载顶压较大时优先在拱顶设置接头;当围岩侧压力较大时,宜在拱底设置接头;4)在不削弱钢架支护力的前提下保证所有可缩接头平稳有效滑移是充分发挥其让压支护性能的关键.
[Abstract]:Through indoor model test, three U-shaped steel horseshoe closed retractable steel frames with retractable joints in different positions were graded and uniformly loaded, and the radial displacement and slip displacement of different positions of the steel frame under different loads were collected. The results show that: 1) the bearing capacity and deformation characteristics of the steel frame are determined by the slip rate of the joint, and the instability of the bearing capacity of the steel frame increases when the joint slips rapidly, which makes the compression deformation obvious; 2) the slip characteristics of the closed retractable steel frame joint are related to the internal force combination of the steel frame at the joint. With the increase of the total external load, the arch roof joint first slips and the rate is faster, followed by the arch foot joint, and the arch bottom joint is the most difficult to slip. 3) when the arch roof joint slips, the arch roof subsidence is the most obvious, so it is suggested that the joint should be set up at the arch bottom when the load top pressure of the surrounding rock is large, and when the side pressure of the surrounding rock is large, the joint should be set up at the bottom of the arch. 4) the key to give full play to the performance of compression support is to ensure the smooth and effective slip of all retractable joints without weakening the support force of steel frame.
【作者单位】： 交通运输部公路科学研究院;北京航空航天大学交通科学与工程学院;
【基金】：国家自然科学基金资助项目(51278233) 交通运输部公路科学研究所基金项目(2015-9033)
【分类号】：U451.5
，
本文编号：2493068
[Abstract]:Through indoor model test, three U-shaped steel horseshoe closed retractable steel frames with retractable joints in different positions were graded and uniformly loaded, and the radial displacement and slip displacement of different positions of the steel frame under different loads were collected. The results show that: 1) the bearing capacity and deformation characteristics of the steel frame are determined by the slip rate of the joint, and the instability of the bearing capacity of the steel frame increases when the joint slips rapidly, which makes the compression deformation obvious; 2) the slip characteristics of the closed retractable steel frame joint are related to the internal force combination of the steel frame at the joint. With the increase of the total external load, the arch roof joint first slips and the rate is faster, followed by the arch foot joint, and the arch bottom joint is the most difficult to slip. 3) when the arch roof joint slips, the arch roof subsidence is the most obvious, so it is suggested that the joint should be set up at the arch bottom when the load top pressure of the surrounding rock is large, and when the side pressure of the surrounding rock is large, the joint should be set up at the bottom of the arch. 4) the key to give full play to the performance of compression support is to ensure the smooth and effective slip of all retractable joints without weakening the support force of steel frame.
【作者单位】： 交通运输部公路科学研究院;北京航空航天大学交通科学与工程学院;
【基金】：国家自然科学基金资助项目(51278233) 交通运输部公路科学研究所基金项目(2015-9033)
【分类号】：U451.5
，
本文编号：2493068
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