桩径对山区输电线塔基础抗震性能影响分析  

Influence of the Pile Diameter on the Seismic Response of the Transmission Line Pylon Foundation in Mountainous Areas

作　　者：喻豪俊 陈继彬[1,2] 丁梓涵 

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),四川成都610059 [2]成都理工大学环境与土木工程学院,四川成都610059

出　　处：《水利与建筑工程学报》2015年第4期101-106,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家重点基础研究发展计划(2011CB013501);长江学者和创新团队发展计划(IRT0812)

摘　　要：西南山区越来越多的输电线塔建立在倾斜的陡坡之上,并且大多要穿越高烈度地震区。其中,桩基础因具有良好的抗震性能,在山区输电线塔基础设计中被广泛采用。而针对山区陡坡地形地貌的复杂情况,对其输电线塔桩基础的抗震性能研究较少,其中桩径对山区输电线路桩基地震反应有什么影响,还不清楚。采用FLAC3D数值分析软件,以西南山区典型输电线塔桩基础为研究对象,运用时程分析方法,对1.4 m到2.6 m不同桩径进行桩基的动力计算。通过有限元模拟,分析了桩径对桩基础地震动力响应的变化情况,探讨桩径对山区输电线路桩基抗震性能的影响。研究结果表明:随着桩径的增大,桩身水平、竖向峰值加速度和水平位移均呈减小的趋势,而桩身竖向位移和桩身内力随桩径的增大而逐渐增大。A growing number of transmission line towers are being constructed on the inclined steep slopes in southwest mountainous area, and most of these are in intensive seismic region. Pile foundation is widely used in the foundation de- sign of transmission towers in southwest mountainous area due to its good seismic performance. However, according to the complicated condition of the mountainous southwest steep topography, research on the seismic performance of the pile foundation of the transmission line towers is rare. It is still unclear that how the pile diameter will affect the seismic per- formance of transmission tower foundation. Here, typical models about pile foundations of transmission towers in south- west mountainous area were computed and analyzed by using FLAC3D. Then the influence of the pile diameter on the seismic response of the foundation was analyzed by using time history analysis method, with the pile diameters from 1.4 m to 2.6 m. The results indicate that with the increase of pile diameter, pile peak acceleration and horizontal displace- ment show a trend of decrease, while the pile vertical displacement and internal force increase along with the pile diame- ter.

关 键 词：西南山区 桩径 输电线路 地震反应 

分 类 号：TU43[建筑科学—岩土工程]