特高压输电铁塔挖孔扩底桩承载力影响因素分析

Analysis on the Pile Capacity Factors of UHV Transmission Tower Digging Piles with Enlarged Bottom

挖孔扩底桩抗拔承载力高、施工方便、对环境破坏小、节约材料量等,在输电线路工程中得到了比较广泛的使用,但是它的承载机理比较复杂,而且影响扩底桩承载力的因素很多。论文以某特高压交流双回山区线路工程2型直线和转角塔为分析对象,通过大量计算归纳总结出桩基扩底影响范围、桩长、桩径、扩底直径、扩底高度对桩上拔承载力、下压承载力、水平位移和材料量的影响规律。

Digging piles with enlarged bottom have many advantages,such as higher uplift resistance, construction convenient, friendly to the environment, saving the amount of material.So it was widely used in power transmission line project,but its bearing mechanism is very complicated. Besides, there are many factors affecting the uplift resistance. In this paper, type 2 suspension and strain tower of a UHV AC double circuit transmission line project in the high mountain were taken as analysis object. A large number of calculations were done to summarize the influence of bottom-enlarged affected range, pile length, pile diameter, diameter of the bottom-enlarged, height of the bottom-enlarged to uplift resistance, compressive capacity, horizontal displacement and the amount of material.