RESEARCH ARTICLE


Research on Anti-Foundation-Displacement Performance and Reliability Assessment of 500 kV Transmission Tower in Mining Subsidence Area



Qianjin Shu*, 1, Guanglin Yuan1, Yunfei Zhang2, Guangli Guo3
1 School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
2 Xuzhou Power Supply Company, Xuzhou, Jiangsu 221006, China
3 School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China


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Creative Commons License
© 2011 Shu et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; Tel: +86-516-83995252; Mobile: +86-13605200117; E-mail: shuqj0519@163.com


Abstract

The performance of resisting foundation displacement of typical single return circuit and double return circuit transmission towers under all kinds of load conditions including foundation horizontal displacement, foundation vertical uneven downward displacement were analyzed by finite element modeling. Results showed that stability failure of single steel angle represents tower’s limit state under foundation displacement. The corresponding foundation displacement limits were calculated. And the towers’ reliability were assessed by comparing the calculated earth surface deformation in advance to the towers’ earth surface deformation permissibility. Result indicates that tower does not fail when foundation displacements are smaller than 0.5% of tower root distance. The assessment result revealed that under coal mining deformation conditions, complex foundation and measures adjusting the length of bolts between towers’ legs and foundations can ensure all object towers’ safety. The complex foundation is more effective than single foundation in resisting coal mining deformation.

Keywords: Mining subsidence area, multi-ribbed composite , limit state, single return circuit, double return circuit, anti-foundation-displacement performance, 500 kV, reliability assessment.