输电线路斜坡场地地震效应的数值模拟研究  

Numerical Simulation of Seismic Effect on Slope Site of Transmission Line

作　　者：陈禺树 赵其华[1,2] 陈继彬[1,2] CHEN Yushu;ZHAO Qihua;CHEN Jibin(State Key Laboratory of Geological Hazard Prevention and Control and Geological Environment Protection Chengdu University of Technology, Chengdu, Sichuan 610059, China;School of Environmental and Civil Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,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》2018年第1期22-27,128,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家重点基础研究发展计划项目(2011CB013501);国家自然科学基金面上项目(41272333)

摘　　要：以西南地区典型输电线塔位为例,考虑场地地基条件、桩基础、杆塔特征,采用FLAC3D数值分析软件进行动力分析,探讨场地遭遇实际地震作用时的场地地震效应。研究表明:坡面与地震波入射方向一致、斜坡坡度40°的薄覆盖层下伏软岩场地,峰值加速度放大系数顺坡面向上具有波动放大的效应,坡面位移从坡脚至坡顶近似呈线性增大。塔位处斜坡微地貌的变化使得峰值加速度放大系数达到1.8左右,地震效应局部放大较原始输入地震烈度增加1度。在此基础上,初步探讨影响斜坡场地地震效应的因素,得出覆盖层厚度、基岩强度对其影响较为明显。Typical models about ground of transmission line in southwestern mountain areas were developed and analyzed by FLAC3D,during which the site condition,characteristic of pile and tower were taken into account.Then seismic re-sponse on ground caused by earthquake was preliminary studied.The results show that when seismic waves are loaded,the PGAs amplification factors response of steep slope with thin overburden-soft bedrock present obvious non-linearity in both vertical and horizontal directions.The elevation has amplification effect on surface displacement.Due to micro geomorphology of slope changing,the PGA amplification factor of the tower is about1.8,and also Earthquake effect of slope can make the local intensity improve1degree.Based on these the influential factors of the response such as the thickness of overburden and bedrock strength were discussed.

关 键 词：斜坡 场地地震效应 输电线路 数值模拟 覆盖层厚度 基岩强度 

分 类 号：TU44[建筑科学—岩土工程]