Experiment on Mechanical Property of Straightwall Semicirclearch Concretefilled Steel Tube Support and its Application
Experiment on Mechanical Property of Straightwall Semicirclearch Concretefilled Steel Tube Support and its Application
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DOI：
10.3973/j.issn.1672-741x.2014.01.002
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发表时间：
2014-01
期刊：
影响因子：
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通讯作者：
Gao Yanfa;Wang Jun;Wanpeng Huang;Bin Chen;W. Liang;W. Chao
中科院分区：
文献类型：
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作者：
Gao Yanfa;Wang Jun;Wanpeng Huang;Bin Chen;W. Liang;W. Chao
【摘要】：设计力学性能试验,比较直壁半圆拱钢管混凝土支护与U型钢支护的性能,以解决常规直壁半圆拱断面巷道支护失稳问题。试验中对钢管混凝土支架的承载力、位移和应变进行了测量和分析，分析了烤弯对钢管原材料抗拉性能的影响以及C60混凝土配合比的合理性。试验表明，钢管混凝土支架具有突出的承载优势。以试验结果为指导,针对华丰煤矿1100水平动压巷道和大树村煤矿450水平新建东翼高应力巷道设计并应用了直壁半圆拱钢管混凝土支护。实践表明，钢管混凝土支架支护效果良好，优于同型材U型钢支架。还发现封闭式直墙半圆拱支撑的脚角是薄弱环节，需要改进和加强。
Mechanical property experiment is designed to compare the performance of straight-wall semicircle-arch concrete-filled steel tube support and that of U-shaped steel support,so as to solve the instability problem of the support for roadways with conventional straight-wall semicircle-arch cross-section. In the experiment,the load bearing capacity, displacement and strain of the concrete-filled steel tube support are measured and analyzed,and the influence of the roasted bend on the anti-tensioning property of the raw material of the steel tubes,as well as the rationality of the mixing ratio of the C60 concrete,are analyzed. The experiment shows that the concrete-filled steel tube support has outstanding load-bearing advantages. Guided by the experiment results,straight-wall semicircle-arch concrete-filled steel tube support is designed and applied for the 1100 horizontal dynamic pressure roadway of Huafeng coal mine and the 450-level new east wing high stress roadway of Dashucun coal mine. The practice shows that the concrete-filled steel tube support has good supporting effect and is superior to the U-shaped steel support with the same profile. It is also found that the foot corners of the closed straight-wall semicircle-arch support are weak points and need to be improved and strengthened.