全掏挖基础在戈壁滩地区输电线路中的应用

The Application of Bell Ended Piers for Transmission Lines in the Gobi Desert

基于戈壁滩输电线路碎石土地基全掏挖基础试验,在戈壁滩地区全掏挖基础上拔破坏模式研究的基础上,对土体剪切面半径影响参数n、上拔剪切范围内土重等方面进行了研究分析,提出了抗拔承载力修正公式;同时建议戈壁滩碎石土地基中的掏挖基础按摩擦端承桩进行抗压承载力计算;利用上述成果,对±800kV输电线路全掏挖基础几何参数采用遗传算法进行优化,结果表明,按推荐的全掏挖基础与按规范通用计算公式(n=1.5)设计的全掏挖基础相比,综合造价节约20%以上。

This paper recommends an uplift capacity formula for bell ended piers in cobble-gravel sized materials in the Gobi Desert. The uplift capacity is established based on the influence zone of the soil shear failure plane parameter, n; and the influ- ence zone of the uplift shear failure mode. The axial compressive capacity of the bell ended pier is also recommended. The foun- dation dimensions of 800 kV transmission lines are optimized using a generic algorithm. The results indicate that an overall cost saving of 25% can be achieved when compared to the recommended method with the code specified formula （n=1. 5）.