降雨诱发山区线路溜坡的模型试验与机理研究  

Model Test and Mechanism Research on Rainfall-Induced Shallow Landslides of Mountain Overhead Transmission Line

作　　者：周凯敏[1] 周健[2] 

机构地区：[1]福建省电力勘测设计院,福州市350003 [2]同济大学地下建筑与工程系,上海市200092

出　　处：《电力建设》2013年第11期7-11,共5页Electric Power Construction

基　　金：国家自然科学基金项目(41272296)

摘　　要：长时间降雨常引起山区架空输电线路塔位边坡发生浅层溜坡,给线路的运行带来重大安全隐患。影响溜坡的因素众多且相互干扰。利用自制小比例尺模型槽进行人工降雨诱发溜坡的室内模型试验,分析在强降雨条件下土性对溜坡的影响。通过在试验过程中对溜坡的破坏形态和位移场进行分析,研究强降雨条件下土体发生溜坡下滑的内在机理。研究表明,浅层溜坡是一个雨水入渗、土体变形、基质吸力降低、孔压升高、土水相互作用的复杂过程。在强降雨条件下的溜坡呈流滑型破坏类型,即呈流态化的后部土体在土水重力和水体渗透力共同作用下,推动前部土体快速下滑。Shallow landslides happen frequently after continuous rainfall at mountain overhead transmission lines, which have many influencial factors and bring serious hidden danger to power transmission lines. Using the self-developed small- scale model flume, the experiments of shallow landslides triggered on sandy soil under simulated rainfall were carded out to investigate the displacement fields and failure modes of shallow landslides, as well as to study the inherent mechanism of shallow landslide under heavy rainfall conditions. The results show that the shallow landslides processes involve a complex course including rainfall infiltration, soil deformation, metrics suction lost, pore pressure rise and water-soil interaction. The shallow landsides under heavy rainfall are changed into fluidized flow, and the fluidized soil pushes the front soil to move rapidly.

关 键 词：架空线路 溜坡 降雨 室内试验 水土作用 

分 类 号：TU47[建筑科学—结构工程]