滑坡区输电铁塔安全性分析与评价

Safety Analysis and Evaluation of Transmission Towers in Landslide Areas

架空输电线路不可避免的要跨越山区地带,很容易遭受到滑坡地质灾害的袭击。位于滑坡区的输电铁塔会发生变形,威胁输电安全。以滑坡区某500 kV输电线路332号铁塔为研究对象,把滑坡作用和三种气象工况组合得到3种综合工况,利用ANSYS对其进行有限元计算,分析构件力学特性,研究3种综合工况铁塔倾斜位移与塔脚位移、最大应力和控制应力间的变化规律。最后,建立了输电铁塔安全性评价模型,用于不同阶段滑坡作用下输电铁塔的安全性评价。结果表明,对滑坡区输电铁塔应以第一道横隔面杆件应力监测为重点,最低温综合工况是最不利工况。研究结果对同类滑坡条件输电铁塔的安全性评估具有参考意义。

As overhead transmission lines have to cross mountainous areas,they are vulnerable to landslides.The transmission towers located in the landslide area are prone to be deformed,posing threats to safety of the transmission system.Taking the 332#tower of a 500kV transmission line in the landslide area as the research object,this paper combines and integrates the landslide effect and three kinds of meteorological conditions to form three kinds of comprehensive conditions.The ANSYS finite element calculation software is used to study the inclined displacement,the tower foot displacement,the maximum stress and control stress changes law under three kinds of conditions.Finally,the safety evaluation model of the transmission tower is established,which is used to evaluate the safety of transmission towers under different stages of landslide.The results show that the stress of the first cross-section bar should become the major monitoring point for the transmission tower in the landslide area,and the lowest temperature condition is the most unfavorable conditions.The results of this study are of important reference significance to the safety evaluation of the transmission towers in the similar landslide condition.