基于多源数据三维可视化集成的高切坡解译

三峡库区移民迁建工程涉及20个区(县),在城镇和公路等基础设施建设中,人工开挖而形成了大量的高切坡,其中约90%处于不稳定状态,严重威胁着库区人民生命财产安全。选择库区长江干流具有代表性的秭归-巴东库段作为研究区,采取遥感、地理信息、地质图等多源数据融合及三维可视化技术,解译了高切坡177处(总长度25.165km),提取了高切坡的位置、规模、地层、坡度、斜坡结构、工程防护措施和危害对象等信息,并分析了高切坡与地层、岩性、坡度和斜坡结构的关系。研究表明:①高切坡主要分布于城镇区及公路内侧;②碳酸盐岩、结晶岩和碎屑岩3种工程岩组中高切坡的稳定性依次降低;③香溪-泄滩亚段碎屑岩地区高切坡稳定性差,应重点防治。

High Cutting Slope Interpretation Based on Multi-Source Data Integration and Three Dimensional Visualization

The infrastructure reconstruction of 20 new towns for the Three Gorges Project migration caused a large number of high cutting slopes(HCS),in which about 90 percentage of the HCS are unstable and thus lead to a serious threaten to the transportation and the people’s lives and properties.The integration and three-dimension visualization of digital mapping camera(DMC) images,light detection and ranging(LIDAR) data,geological maps is carried out for the interpretation and features extraction of the HCS from Zigui to Badong section.177 high cutting slopes with 25.165 km in length in this area are interpreted and the location,size,slope,the slope structure and protective measures of the HCS in this area are obtained by the interpretation and field investigation.Investigation and analysis shows that high cutting slopes mainly distribute in the immigrant towns and the major highways,and its size and stability is controlled by lithology,slope and slope structure;the stability of the HCS in carbonate rocks,crystalline rocks and clastic rocks decreased gradually,and Xiangxi to Xietan section within clastic rock should be have a priority to control and protect because of the low stability of the high cutting slopes in this area.