摘要
煤矿的开采沉陷对井田上方高压输电线铁塔的安全性能有重要影响。采用有限元方法,通过建立高压输电线铁塔模型,分别从地表不均匀沉降响应、屈曲分析及模态分析三方面研究高压输电线铁塔的强度和安全性。结果表明,当高压线铁塔发生长向、短向两支座地表倾斜、地表水平变形时,铁塔腿固定侧的杆件损害最严重。因此,对采空区的铁塔腿部构件应适当补强以增加承载能力,并增强铁塔抗风险能力。对铁塔进行屈曲分析得出铁塔的临界不均匀下沉值为0.852m,比强度分析结果(0.04m)大得多,这表明铁塔先进行强度破坏。通过对铁塔进行的模态分析得到其固有频率和相应振型。
The present paper is dedicated to a numerical simulation of the safety function of high-voltage transmission tower in goal. As isknown, high-voltage transmission system is the principal part of in- frastructure and energy resource supply warranty for the mining pro- duction. However, the function of high-voltage transmission tower has been greatly affected by the mining underground backup. In this pa- per, we have taken No. 1 coal mine of Coking Coal Group Co. ,Ltd, Jiaozuo, Henan, as our sample model of such transmission towers. The numerical simulation results of our research show that the fixed member bars of the tower props were seriously damaged with the ground surface tilted and the tower longitudinal and brachydiagonal brackets horizontally deformed. Therefore, the prop components of the tower in goaf were to be reinforced to increase its bearing and sus- tenance capability. Buckling analysis of the tower shows that the criti- cal uneven subsidence value is 0.852 m, which tends to be much higher than 0.04 m, i.e. the strength needed from the analysis. This also indicates that the first layer damage of the transmission tower is a kind of strength failure, though the tower itself won＇ t suffer the un- stable damage. In addition, the critical data of the surface deforma- tion for the tower can be shown as follows： the maximum surface de- clivity deformation is 7. 605 mm/m; the maximum horizontal tensile （11.407 mm/m, whereas the maximum horizontal compression defor- mation equals l1.027 mm/m. The key point of the maximum defor- mation in the tower took place in the first layer. In order to avoid fur- ther failure, we think it is necessary to reduce the slandering ratio to meet the strength demand and the rigidity demand of the first layer. We have also obtained the natural frequencies and the corresponding vibration modes via modal analysis, which helps us to make a more precise description of the vibration features of high-voltage transmis- sion tower so as to prevent further resonance of the loaded st
出处
《安全与环境学报》
CAS
CSCD
北大核心
2013年第1期171-179,共9页
Journal of Safety and Environment
基金
河南省重点学科项目(509919)
河南理工大学博士基金项目(B2009-84)
关键词
安全工程
高压输电线铁塔
地表沉陷
屈曲分析
模态分析
safety engineering
high-voltage transmission tower
surface subsidence
buckling analysis
modal analysis
