岩石山区输电线路微型桩抗剪性能有限元分析

Finite Element Analysis of Shear Performance of Transmission Line Micro-pile in Rocky Mountainous Area

微型桩具有结构简单、施工周期短和绿色环保等优点,在山区输电线路工程中具有广泛的应用前景,也符合电网建设机械化施工的发展方向。利用有限元分析方法,建立了岩石山区输电线路微型桩的抗剪力学模型,研究了微型桩在水平荷载下的承载能力,讨论了不同桩径、桩身弹性模量以及岩石地质参数对微型桩抗剪性能的影响。研究结果表明:除了岩石地质参数,山区输电线路微型桩的抗剪性能还受桩体几何结构参数的影响。随着桩径和桩身弹性模量的增加,微型桩的抗剪性能相应提高,其中桩径对微型桩水平承载力影响最大;当土体弹性模量、摩擦角和黏聚力增加时,桩身位移将非线性递减,其中摩擦角对桩身水平位移的影响最大,土体弹性模量影响最小。

Due to the advantages of simple structure,short construction period and green environmental protection,micro-pile has an extensive application prospect in transmission line engineering of rocky mountainous area,which also conforms to the mechanized construction direction of State Grid Corporation of China.Using finite element analysis,a shear mechanical model for micro-piles in rocky mountainous areas for power transmission lines was developed.The bearing capacity of micro-piles under horizontal loads was explored,and then the effects of different pile diameters,elastic moduli of the pile bodies,and geological parameters of the rock on the shear performance of the micro-piles were discussed.The results indicate that,in addition to geological parameters,the shear performance of micro-piles in mountainous power transmission lines is also influenced by the geometric parameters of the pile body.With the increase in pile diameter and elastic modulus of the pile body,the shear performance of the micro-piles correspondingly improves,and pile diameter has the most significant influence on horizontal bearing capacity.With the increase of the elasticity modulus,friction angle and cohesion force of the soil,the displacement of the pile body decreases nonlinearly.The friction angle has the greatest effect on the horizontal displacement,while the elasticity modulus of the soil has the least effect.