特高压直流输电线路塔基边坡的稳定性分析  

Stability Analysis of Tower Foundation Slope of UHV DC Transmission Line

作　　者：谢寿平 刘志鹏[2] 罗红明[3] 王大庆 杨桦 刘凯 苏云鹏 XIE Shouping;LIU Zhipeng;LUO Hongming;WANG Daqing;YANG Hua;LIU Kai;SU Yunpeng(Guizhou Expressway Group Co.,Ltd.,Guiyang 550004,China;CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Science,Wuhan 430071,China)

机构地区：[1]贵州高速公路集团有限公司,贵州贵阳550004 [2]中交第二公路勘察设计研究院有限公司,湖北武汉430056 [3]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《安全与环境工程》2019年第6期172-177,共6页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(41402318)

摘　　要：山区输电线路工程塔基一般修建于自然边坡上,塔基边坡的稳定状态是涉及输电线路工程安全的关键技术问题。以甘肃酒泉—湖南±800 kV特高压直流输电线路工程5535#塔基边坡为例,采用三维有限差分数值模拟方法,利用FLAD 3D软件对塔基和塔基边坡的稳定性进行了分析。结果表明:塔基在荷载作用下,桩顶位置产生了向坡外向下的位移,桩端位置产生了向坡内的位移,且桩水平位移最大值为4.025 mm,处于桩水平变形允许范围内;塔基荷载作用对边坡的应力总体影响不大,局部范围内应力有所增加,且仅在坡顶局部出现拉破坏,坡顶以下坡体处于弹性变形范围,未形成整体变形失稳的破坏区,对边坡的整体稳定性影响较小;建议对塔基边坡坡顶进行适当的加固处理,以满足特高压直流输电线路工程安全运行的要求。The tower foundation of transmission line project in mountainous area is generally built on natural slope.The stability of the tower foundation slope is a key technical problem related to the safety of transmission line project.Taking 5535#tower foundation slope of Jiuquan-Hunan 800 kV UHV DC transmission line in Gansu Province as an example,by the three-dimensional finite difference numerical simulation method this paper analyzes the stability of the tower foundation and the tower foundation slope.The results show that the top of the pile foundation is displaced downward and the position of the end of the pile is displaced inward the slope by the vertical load and horizontal load of the tower foundation.The maximum horizontal displacement of the pile is 4.025 mm,which is within the allowable range of the horizontal deformation of the pile.The stress of the slope has little effect on the overall stress of the slope,and increases in the local area,and only tensile failure occurs at the top of the slope.The slope below the top of the slope is in the elastic deformation range,and there is no failure zone of the overall deformation and instability,which has little effect on the overall stability of the slope.It is recommended to carry out appropriate reinforcement treatment on the slope top of tower foundation to meet the requirements for safe operation of the UHV DC transmission line project.

关 键 词：输电线路 塔基边坡 稳定性分析 三维有限差分数值模拟方法 

分 类 号：TM7[电气工程—电力系统及自动化]