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Mathematical Problems in Engineering
Volume 2017, Article ID 1372815, 11 pages
https://doi.org/10.1155/2017/1372815
Research Article

The Load Capacity Model and Experimental Tests of a New Yielding Steel Prop

1State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China
2School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China

Correspondence should be addressed to Yu Wu; nc.ude.tmuc@uyuw

Received 29 August 2017; Accepted 14 November 2017; Published 27 December 2017

Academic Editor: Roman Wendner

Copyright © 2017 Yanlong Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

As the mining depth increases year by year, the deformation and failure of deep roadway become more and more serious, and new support equipment with high supporting force and yieldable character is quite necessary for mining safety. In this research, a new yielding steel prop with high stable load capacity was introduced, which features sustaining large deformation in the field. Based on principle stress method and elastic-plastic theory, a mathematical model of load capacity was proposed for the new prop. The results show that the stable load capacity of the prop increases linearly with the increase of the effective number of the steel balls. Meanwhile, the stable load capacity of the prop increases initially and decreases afterwards with the increase of the radius of the steel ball. Under the fixed radius of the steel ball, the stable load capacity will increase with the decrease of the gap between the inner tube and the outer tube. The stable load capacity of the prop calculated using the theoretical model quantitatively agrees with that of the experimental tests, with only an error within 5%.