关键词: 输电杆塔基础;极限荷载;滑坡稳定性;塑性区;

Abstract: With the rapid development of urban electric and transportation construction in mountainous areas,the high-voltage transmission line towers are inevitably built on hillsides or landslides,which is easy to cause secondary loading to the natural side of the landslide,and has a negative impact on the stability of tower base. In view of this,we present a study on the influence of the ultimate load state on stability of the tower foundation and the landslide in the operation period with an engineering example. Firstly,the extreme working conditions of the transmission tower foundation under different operating conditions were determined.Based on theCode for Design of110-750 kVOverhead Transmission Line(GB 50545-2010),the stability of tower foundation was preliminarily evaluated. On this basis,we used three-dimensional numerical simulation method to study the disturbance from foundation load on soil around the foundation in term of foundation displacement and plastic zone of surrounding soils. We illuminated the relation between foundation stability and wind speed and the embedded depth of foundation. The research results can provide some technical references for construction of high-voltage transmission line tower in mountainous area.

Key words: transmission tower foundation; ultimate load; landslide; stability; plastic zone;