山区输电线路嵌岩桩水平位移计算及其影响因素

Calculation and Influence Factors on Lateral Displacement of Rock-socketed Piles for Transmission Lines

嵌岩桩是我国山区输电线路主要基础型式,其水平位移计算一直是工程设计的难点。综合不同行业嵌岩桩水平承载性能研究成果并结合山区输电线路基础特点,提出嵌岩桩基础水平位移算模型与方法,可满足嵌岩桩基础最小嵌岩深度要求,也可根据塔位地层分布特征、地基岩土体性质、桩基混凝土及其配筋情况进行嵌岩桩基础立柱水平位移进行计算与验算。在此基础上,分析输电线路嵌岩桩水平计算时的影响因素。结果表明:桩径对嵌岩桩水平位移影响最敏感,当嵌岩桩埋深大于最小嵌岩深度后,增加嵌岩段桩长对基顶部水平位移影响较小。

Rock-socketed pile is a main type of transmission line foundation in mountainous areas.The lateral displacement of a rock-socketed pile has been a difficulty in the design of transmission line foundations in mountainous areas.In this study,the calculation method of the lateral displacement of rock-socketed piles in mountain transmission lines was presented respectively,which simultaneously consider the minimum rock socketed depth and the lateral pile-head displacement of the foundation considering the soil layer property,pile concrete and reinforcing bars.Then,the influence factors of the horizontal bearing capacity of rock-socketed piles in transmission lines were analyzed.The results indicated that the pile diameter is the most sensitive factor to thelateral displacement of rock socketed piles.Increasing the pile length of rock socketed section has little effect on the lateral displacement of the pile head when the depth of rock socketed pile was greater than the minimum rock socketed depth.