CAJ | 학술논문

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1．4m到2．6m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。
서남산구월래월다적수전선탑건립재경사적두파지상，병차대다요천월고열도지진구。기중，장기출인구유량호적항진성능，재산구수전선탑기출설계중피엄범채용。이침대산구두파지형지모적복잡정황，대기수전선탑장기출적항진성능연구교소，기중장경대산구수전선로장기지진반응유십요영향，환불청초。채용FLAC3D수치분석연건，이서남산구전형수전선탑장기출위연구대상，운용시정분석방법，대1．4m도2．6m불동장경진행장기적동력계산。통과유한원모의，분석료장경대장기출지진동력향응적변화정황，탐토장경대산구수전선로장기항진성능적영향。연구결과표명：수착장경적증대，장신수평、수향봉치가속도화수평위이균정감소적추세，이장신수향위이화장신내력수장경적증대이축점증대。
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 .