Instability analysis of vegetation-covered roadside slope using mobile LIDAR

• Main Authors: Chien-KangLin, 林建綱
• Other Authors: Teng-To Yu
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/12757078965862671166

碩士 === 國立成功大學 === 資源工程學系 === 103 === The most traditional method of investigating the geo-structure is to measure the rock slope by inclinometer manually. Furthermore, there are also several systematic ways to conduct similar tasks such as scan-line method or observation window method. However, all of these operations cost intense time and human resources, it shall coped with potential of danger while measuring the data beneath an unstable slope. The major purpose of this study is to clean out the vegetation from mobile LiDAR data, which is grow between the crack and enshroud the point cloud from the covered rock, to provide more data of the rock joints from the covered rock for further analysis. Two study sites are the rocky slopes next to highway No.8 in Taroko, eastern Taiwan. The different of surface vegetation are filtered via methods of qPCV method or CANUPO depend on the reality condition. Fitting the three-dimensional geo-structures with a digital plane objects by means of clusters concentration are carried out. Finally, the Markland test method is used to analyze the stability of the angle between geo-structures. These two study sites are calculated with various failure angle、slope and azimuth. Around 30% of chance would cause a wedge failure in these areas. In these two study sites, the process that clean out the covered vegetation to retain the data beneath it could gain extra 21% of data than the regular means of erasing all the covered data. In the future data gathered from different time could be compared, if the existence of loosened rock or the enlargement of fracture zone is detected, an early warning to the highway authority could be issued.