沿海软土地区复杂环境条件变化对运行输电线路基础变形影响研究
Investigation on the Influence of Complex Environmental Conditions Changes on the Deformation of Operating Transmission Line Foundations in Coastal Soft Soil Areas

沿海软土地区运行输电线路基础容易受塔位附近地基沉降、地下水位变化以及台风等复杂环境条件变化影响，既有输电线路基础由此产生的变形将直接关系到输电线路运行安全。本文以广东省沿海软土地区某运行输电线路既有桩基为研究对象，量化分析了塔位附近道路沉降、地下水位变化以及台风荷载等复杂环境条件的变化规律，并采用FLAC^3D软件模拟分析了这些复杂环境因素组合作用对既有输电线路基础变形影响规律。结果表明：塔位附近道路地基沉降、地下水位变化以及台风荷载等复杂环境条件变化都会对基础竖向沉降和水平位移产生影响。塔位周围软土地基沉降、地下水位变化对基础竖向沉降影响最大，但对基础水平位移相对较小，而台风作用将显著地增加基础的竖向沉降和水平位移。
The foundations of operating transmission lines in coastal soft soil areas are easily affected by complex environmental conditions such as road settlement near tower locations, changes in groundwater level. The deformation resulted from the complex environmental conditions changes may have a direct impact on the existing transmission line foundations, which will affect the safety of the foundations. In this study, a pile foundation of the transmission line tower in a coastal soft soil region in Guangdong Province was taken as an example. The complex environmental conditions such as road settlement, groundwater level changes, and typhoon loads near the pile foundation of the transmission tower were quantitatively analyzed. The impact laws of these complex environmental factors on the deformation of existing transmission line foundations were simulated by FLAC^3D software. The results indicated that complex environmental conditions such as road foundation settlement, groundwater level changes, and typhoon loads near the tower site can all have an impact on the vertical settlement and horizontal displacement of the foundation. The settlement of soft soil foundation and changes in groundwater level around the tower had the greatest impact on the vertical settlement of the foundation, but had a relatively small impact on the lateral displacement of the foundation. Typhoon load could significantly increase the vertical settlement and lateral displacement of the foundation.