盐湖地区输电线路基础沉降控制研究

针对盐湖地区输电线路杆塔基础建设中所面临的盐渍土结构强度低这一特殊地质条件，通过开展平板载荷试验对比分析了不同碎石换填厚度下盐渍土地基的承载特性，并以新疆与西北主网联网750kV第二通道输变电线路工程的斜柱式基础为设计原型计算分析了基础的最终沉降量，分析得到了盐湖地区盐渍土软弱地基的沉降控制处理方案。结果表明，在盐湖地区输电线路地基基础工程中采用基底换填碎石的方法可显著提高地基承载力，有效降低基础沉降量。

Research on Settlement Control of the Transmission Line Foundation in Salt Lake Area

During the construction of the transmission line tower foundation in salt lake area, engineers met many special geological conditions, the structure weakness of the saline soil in particular. In this paper, bearing characteristics of the salty soil foundations with different gravel replacement thicknesses are compared through plate loading tests. The pad and chimney foundation is selected as a design proto-type to calculate the final foundation settlement in the second 750 kV power trans- mission line between Xinjiang power grid and the northwest main power grid. The treatment scheme to control the soft salty soil foundation settlement is finally obtained for salt lake area. The results show that the scheme can significantly increase the bearing capacity of the foundation and effectively reduce the amounts of foundation settlement when the gravel replacement thickness of the transmission line tower foundation is 1.0 m in salt lake area.