拉萨周边重要公路沿线地质灾害发育特征及其规律研究

发布时间：2018-05-05 22:06

本文选题：拉萨 + 公路　；参考：《公路》2017年03期

【摘要】：以拉萨市城关区为中心,对周边G318、G109和S202等3条重要生命线工程进行了累计282km野外地质调查,主要对研究区地质灾害类型、发育规律进行了分析总结。研究表明,各公路沿线地质灾害类型主要为崩塌、泥石流和滑坡,分别占60%、24%和16%。其中崩塌主要沿G318分布,以滑移式、倾倒式和错断式为主;泥石流沿G109和G318分布较多,以暴雨型的沟谷泥石流为主;不稳定斜坡数量相对较少,以公路切坡形成的不稳定斜坡为主。同时也常见溜砂坡、碎屑流和坡面滑塌现象。地质灾害在空间和时间上具有群发性和集中诱发特征,且极易由一种灾害引发其他灾害,从而形成灾害链。新构造运动、地震活动、地形地貌、气候条件、地层岩性和人类活动是导致调查区地质灾害发生的重要影响因素。
[Abstract]:Taking Chengguan District of Lhasa as the center, the accumulative 282km field geological survey of three important lifeline projects, such as G318G109 and S202, has been carried out. The types of geological hazards and the rules of development in the study area have been analyzed and summarized. The results show that the main types of geological hazards along the highway are collapse, debris flow and landslide, accounting for 60% and 16% respectively. Among them, collapse mainly distributes along G318, slip type, toppling type and fault type, debris flow distributes more along G109 and G318, and rainstorm type of valley debris flow, the quantity of unstable slope is relatively small. The main unstable slope is formed by cutting slope of highway. At the same time, sand slide slope, debris flow and sloughing are also common. Geological disasters have the characteristics of mass occurrence and centralized induction in space and time, and they are easy to cause other disasters by one kind of disaster, thus forming a disaster chain. Neotectonics, seismicity, topography, climate conditions, stratigraphic lithology and human activities are the important factors that cause geological disasters in the survey area.
【作者单位】：西南交通大学;西藏大学工学院;
【基金】：西藏自治区重点科技计划项目资助,项目编号Z2014A19G2-11
【分类号】：U412.22;P694

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