Full-scale experimental study on bearing capacity of retractable U-steel support

被引：0
|
作者：
Ma M. [1 ,2 ]
Yang X. [1 ,2 ]
Xie W. [3 ,4 ]
Guo X. [5 ,6 ]
Li L. [1 ,2 ]
Zhou J. [1 ,2 ]
机构：
[1] Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai
[2] College of Transportation Engineering, Tongji University, Shanghai
[3] State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou
[4] College of Mining Engineering, China University of Mining and Technology, Xuzhou
[5] Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai
[6] College of Civil Engineering, Tongji University, Shanghai
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 01期
关键词：
bearing capacity; full-scale test; mining engineering; retractable U-steel support; roadway support;
D O I：
10.11817/j.issn.1672-7207.2023.01.026
中图分类号：
学科分类号：
摘要：
The working resistance is an important index to evaluate the quality of the retractable U-shaped steel support, and the load distribution of the support during the working process and mechanical property of the clamp at the overlap position directly affect the exertion of the support's bearing capability. Through the design of the indoor full-scale model test, the load-bearing performance of the support was tested, the changing law of the working resistance of the retractable support was revealed, and the influence of load distribution and clamps types on the working resistance of the support was discussed. The results are as follows. 1) Under the same load, there exists great difference in the waist convergence of the support when it is assembled with double-slot splint clamps (type A) and four-bolt double-slot splint clamps(type B), respectively, and the maximum difference can reach 105.6 mm, while the clamps types has little effect on the vault settlement of the support, and the difference is within 6.16 mm. 2) The vault settlement of the support is negatively correlated with the ratio κ between lateral pressure and top pressure, and the waist convergence is positively correlated with the ratio κ. 3) On the premise of ensuring the same bolt pre-tightening force, the initial shrinkage resistance and the maximum sliding resistance of the support with double-slot splint clamps are higher than those of the support with the four-bolt double-slot splint clamps, while the number of slippage has just the opposite law, which indicates that the former is better than the latter in improving bearing capability of the support. 4) The initial shrinkage resistance and the maximum sliding resistance of the support under the effect of strong lateral pressure(κ=3) are significantly higher than that of the support under the effect of strong top pressure(κ=1/3), and the maximum sliding resistance of the support with type A and B splint clamps at strong lateral pressure is increased by 30% and 24% respectively when compared with the initial shrinkage resistance, while the maximum sliding resistance of the former support with type A and B splint clamps at strong top pressure is reduced by 12% and 22% respectively, indicating that support has better applicability to the strong lateral pressure state. 5) Under the same conditions, compared to the symmetrical load, the support has lower initial shrinkage resistance and the maximum sliding resistance under the eccentric load, which indicates that the eccentric load has unfavorable effect on the capacity of the support. © 2023 Central South University of Technology. All rights reserved.
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页码：280 / 291
页数：11
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