钢管混凝土可缩拱架承载性能试验研究  

Experimental study on structural property of contractible concrete-filled steel tube support

作　　者：魏建军[1,2] 蒋斌松[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]江苏建筑学院江苏省建筑安全与减灾工程研究中心,江苏徐州221116

出　　处：《采矿与安全工程学报》2013年第6期805-811,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51174196);江苏省教育厅高校科研成果产业化推进计划项目(JHB2011-66;JHB2012-69);江苏省青蓝工程项目

摘　　要：通过钢管混凝土单圆管拱架模型的面内加载试验,基于试验结果对拱架模型的变形、应变、承载特性及可缩节点增阻规律进行了研究。试验结果表明:由于钢管和混凝土协同工作,钢管混凝土支架具有较好的弹塑性和承载能力;支架初始缺陷或局部弱化往往是造成支架失稳破坏的重要原因;可缩节点增阻曲线可以分为3阶段,支架滑移后承载力出现波动,应根据现场监测适时对可缩节点进行紧固增阻。最后采用ABAQUS有限元软件对拱架模型的承载和变形特性进行了模拟分析,计算结果与试验值比较接近。Experiments on the concrete-filled steel tubular （CFST） support under symmetrical and un- symmetrical in-plane loadings have been carried out. Based on the experimental results, this paper stud- ies the deformation, strain, the increasing resistance law of contractible joint and ultimate bearing ca- pacity of CFST arch support. The results show that the CFST support has good elastoplasticity and car- rying capacity due to the cooperative work of steel and concrete. Initial imperfection or partial weaken- ing of the support is a major reason for the destruction of the support. The increasing resistance curve of contractible joint can be divided into three stages. The contractible joints should be tightened in a timely manner in accordance with the field monitoring for the beating capacity fluctuated after slip. Finally, the characteristics of bearing and deformation of CFST arch support are analyzed with ABAQUS software, and the simulated results are fairly close to the experimental results.

关 键 词：软岩巷道 钢管混凝土 支架 可缩节点 极限承载力 

分 类 号：TD32[矿业工程—矿井建设]