地质灾害对超高压输电线路杆塔杆件失效影响分析

地质灾害容易导致输电线路杆塔基础发生移动和变形,造成杆塔结构失效甚至损毁,严重影响输电线路的安全稳定运行。针对地质灾害导致的某500 k V杆塔结构受损问题,提出一种基于第四强度理论的判断杆件失效的方法,可准确判断杆件失效部位和失效程度。利用ANSYS软件建立杆塔精细化有限元模型,施加地质灾害下各工况塔基约束条件,基于失效判据对杆塔应力进行分析。结果表明:塔基沉降量达29 mm时,塔腿上横隔面交叉材屈曲失稳;沉降量达76 mm时,塔腿主材失效。塔基沉降和倾斜对杆塔破坏最为严重,塔基侧滑对杆塔影响较小。根据塔材失效的特点,提出杆塔结构加固及灾害监测与预防的建议,结合工程实际,为地质灾害下杆塔的稳定性分析及处理提供一定的指导作用。

Effect of geological disasters on failure of UHV transmission line towers

Geological disasters are likely to cause movement and deformation of the transmission tower foundation, resulting in failure or even damage to the tower structure, seriously affecting the safe and stable operation of the transmission line. Aiming at the damage of a 500 kV tower caused by geological disasters, a method based on the fourth strength theory to judge the failure of the rod is proposed, which can accurately determine the failure position and failure degree of the rod. The ANSYS software was used to establish the refined finite element model of the tower, and the constraints of the tower foundation under various geological disasters were applied. The stress of the tower was analyzed based on the failure criterion. The results show that when the settlement of the tower base reaches 29 mm, the cross-section of the tower leg is buckling and unstable. When the settlement reaches 76 mm, the main material of the tower is ineffective; the settlement and inclination of the tower are the most serious damage to the tower. Side slip has less effect on the tower. According to the characteristics of tower failure, the suggestions for tower structure reinforcement and disaster monitoring and prevention are put forward. Combined with the actual project, it provides a certain guiding role for the stability analysis and treatment of the tower under geological disasters.